Add semantic caching

Reviewed-on: #10

.gitea/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v6
+        with:
+          python-version: "3.12"
+      - run: uv sync --frozen
+      - name: Ruff check
+        run: uv run ruff check
+      - name: Ruff format check
+        run: uv run ruff format --check
+
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v6
+        with:
+          python-version: "3.12"
+      - run: uv sync --frozen
+      - name: Type check
+        run: uv run ty check
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v6
+        with:
+          python-version: "3.12"
+      - run: uv sync --frozen
+      - name: Run tests
+        run: uv run pytest --cov

CLAUDE.md

@@ -0,0 +1,3 @@
+Use `uv` for project management
+Linter: `uv run ruff check`
+Type-checking: `uv run ty check`

pyproject.toml

@@ -13,6 +13,8 @@ dependencies = [
     "mcp[cli]>=1.26.0",
     "pydantic-settings>=2.9.1",
     "pyyaml>=6.0",
+    "redis[hiredis]>=5.0.0,<7",
+    "redisvl>=0.6.0",
 ]
 
 [project.scripts]
@@ -36,3 +38,19 @@ pythonpath = ["."]
 [build-system]
 requires = ["uv_build>=0.8.3,<0.9.0"]
 build-backend = "uv_build"
+
+[tool.ruff]
+exclude = ["scripts", "tests"]
+
+[tool.ty.src]
+exclude = ["scripts", "tests"]
+
+[tool.ruff.lint]
+select = ['ALL']
+ignore = [
+    'D203',    # one-blank-line-before-class
+    'D213',    # multi-line-summary-second-line
+    'COM812',  # missing-trailing-comma
+    'ANN401',  # dynamically-typed-any
+    'ERA001',  # commented-out-code
+]

src/knowledge_search_mcp/__init__.py

@@ -6,10 +6,10 @@ from .models import AppContext, SearchResult, SourceNamespace
 from .utils.cache import LRUCache
 
 __all__ = [
+    "AppContext",
     "GoogleCloudFileStorage",
     "GoogleCloudVectorSearch",
-    "SourceNamespace",
-    "SearchResult",
-    "AppContext",
     "LRUCache",
+    "SearchResult",
+    "SourceNamespace",
 ]

src/knowledge_search_mcp/__main__.py

@@ -1,4 +1,3 @@
-# ruff: noqa: INP001
 """MCP server for semantic search over Vertex AI Vector Search."""
 
 import time
@@ -9,7 +8,11 @@ from .config import _args
 from .logging import log_structured_entry
 from .models import AppContext, SourceNamespace
 from .server import lifespan
-from .services.search import filter_search_results, format_search_results, generate_query_embedding
+from .services.search import (
+    filter_search_results,
+    format_search_results,
+    generate_query_embedding,
+)
 
 mcp = FastMCP(
     "knowledge-search",
@@ -44,7 +47,7 @@ async def knowledge_search(
     log_structured_entry(
         "knowledge_search request received",
         "INFO",
-        {"query": query[:100]}  # Log first 100 chars of query
+        {"query": query[:100]},  # Log first 100 chars of query
     )
 
     try:
@@ -61,9 +64,26 @@ async def knowledge_search(
         log_structured_entry(
             "Query embedding generated successfully",
             "INFO",
-            {"time_ms": round((t_embed - t0) * 1000, 1)}
+            {"time_ms": round((t_embed - t0) * 1000, 1)},
         )
 
+        # Check semantic cache before vector search
+        if app.semantic_cache is not None and source is None:
+            cached = await app.semantic_cache.check(embedding)
+            if cached is not None:
+                t_cache = time.perf_counter()
+                log_structured_entry(
+                    "knowledge_search completed from cache",
+                    "INFO",
+                    {
+                        "embedding_ms": f"{round((t_embed - t0) * 1000, 1)}ms",
+                        "cache_check_ms": f"{round((t_cache - t_embed) * 1000, 1)}ms",
+                        "total_ms": f"{round((t_cache - t0) * 1000, 1)}ms",
+                        "cache_hit": True,
+                    },
+                )
+                return cached
+
         # Perform vector search
         log_structured_entry("Performing vector search", "INFO")
         try:
@@ -74,17 +94,13 @@ async def knowledge_search(
                 source=source,
             )
             t_search = time.perf_counter()
-        except Exception as e:
+        except Exception as e:  # noqa: BLE001
             log_structured_entry(
                 "Vector search failed",
                 "ERROR",
-                {
-                    "error": str(e),
-                    "error_type": type(e).__name__,
-                    "query": query[:100]
-                }
+                {"error": str(e), "error_type": type(e).__name__, "query": query[:100]},
             )
-            return f"Error performing vector search: {str(e)}"
+            return f"Error performing vector search: {e!s}"
 
         # Apply similarity filtering
         filtered_results = filter_search_results(search_results)
@@ -98,32 +114,33 @@ async def knowledge_search(
                 "total_ms": f"{round((t_search - t0) * 1000, 1)}ms",
                 "source_filter": source.value if source is not None else None,
                 "results_count": len(filtered_results),
-                "chunks": [s["id"] for s in filtered_results]
-            }
+                "chunks": [s["id"] for s in filtered_results],
+                "cache_hit": False,
+            },
         )
 
         # Format and return results
+        formatted = format_search_results(filtered_results)
+
         if not filtered_results:
             log_structured_entry(
-                "No results found for query",
-                "INFO",
-                {"query": query[:100]}
+                "No results found for query", "INFO", {"query": query[:100]}
             )
 
-        return format_search_results(filtered_results)
+        # Store in semantic cache (only for unfiltered queries with results)
+        if app.semantic_cache is not None and source is None and filtered_results:
+            await app.semantic_cache.store(query, formatted, embedding)
 
-    except Exception as e:
+        return formatted
+
+    except Exception as e:  # noqa: BLE001
         # Catch-all for any unexpected errors
         log_structured_entry(
             "Unexpected error in knowledge_search",
             "ERROR",
-            {
-                "error": str(e),
-                "error_type": type(e).__name__,
-                "query": query[:100]
-            }
+            {"error": str(e), "error_type": type(e).__name__, "query": query[:100]},
         )
-        return f"Unexpected error during search: {str(e)}"
+        return f"Unexpected error during search: {e!s}"
 
 
 def main() -> None:

src/knowledge_search_mcp/clients/base.py

@@ -1,4 +1,3 @@
-# ruff: noqa: INP001
 """Base client with shared aiohttp session management."""
 
 import aiohttp

src/knowledge_search_mcp/clients/storage.py

@@ -1,4 +1,3 @@
-# ruff: noqa: INP001
 """Google Cloud Storage client with caching."""
 
 import asyncio
@@ -8,8 +7,9 @@ from typing import BinaryIO
 import aiohttp
 from gcloud.aio.storage import Storage
 
-from ..logging import log_structured_entry
-from ..utils.cache import LRUCache
+from knowledge_search_mcp.logging import log_structured_entry
+from knowledge_search_mcp.utils.cache import LRUCache
+
 from .base import BaseGoogleCloudClient
 
 HTTP_TOO_MANY_REQUESTS = 429
@@ -56,7 +56,7 @@ class GoogleCloudFileStorage(BaseGoogleCloudClient):
             log_structured_entry(
                 "File retrieved from cache",
                 "INFO",
-                {"file": file_name, "bucket": self.bucket_name}
+                {"file": file_name, "bucket": self.bucket_name},
             )
             file_stream = io.BytesIO(cached_content)
             file_stream.name = file_name
@@ -65,7 +65,7 @@ class GoogleCloudFileStorage(BaseGoogleCloudClient):
         log_structured_entry(
             "Starting file download from GCS",
             "INFO",
-            {"file": file_name, "bucket": self.bucket_name}
+            {"file": file_name, "bucket": self.bucket_name},
         )
 
         storage_client = self._get_aio_storage()
@@ -87,15 +87,18 @@ class GoogleCloudFileStorage(BaseGoogleCloudClient):
                         "file": file_name,
                         "bucket": self.bucket_name,
                         "size_bytes": len(content),
-                        "attempt": attempt + 1
-                    }
+                        "attempt": attempt + 1,
+                    },
                 )
             except TimeoutError as exc:
                 last_exception = exc
                 log_structured_entry(
-                    f"Timeout downloading gs://{self.bucket_name}/{file_name} (attempt {attempt + 1}/{max_retries})",
+                    (
+                        f"Timeout downloading gs://{self.bucket_name}/{file_name} "
+                        f"(attempt {attempt + 1}/{max_retries})"
+                    ),
                     "WARNING",
-                    {"error": str(exc)}
+                    {"error": str(exc)},
                 )
             except aiohttp.ClientResponseError as exc:
                 last_exception = exc
@@ -104,15 +107,18 @@ class GoogleCloudFileStorage(BaseGoogleCloudClient):
                     or exc.status >= HTTP_SERVER_ERROR
                 ):
                     log_structured_entry(
-                        f"HTTP {exc.status} downloading gs://{self.bucket_name}/{file_name} (attempt {attempt + 1}/{max_retries})",
+                        (
+                            f"HTTP {exc.status} downloading gs://{self.bucket_name}/"
+                            f"{file_name} (attempt {attempt + 1}/{max_retries})"
+                        ),
                         "WARNING",
-                        {"status": exc.status, "message": str(exc)}
+                        {"status": exc.status, "message": str(exc)},
                     )
                 else:
                     log_structured_entry(
                         f"Non-retryable HTTP error downloading gs://{self.bucket_name}/{file_name}",
                         "ERROR",
-                        {"status": exc.status, "message": str(exc)}
+                        {"status": exc.status, "message": str(exc)},
                     )
                     raise
             else:
@@ -123,7 +129,7 @@ class GoogleCloudFileStorage(BaseGoogleCloudClient):
                 log_structured_entry(
                     "Retrying file download",
                     "INFO",
-                    {"file": file_name, "delay_seconds": delay}
+                    {"file": file_name, "delay_seconds": delay},
                 )
                 await asyncio.sleep(delay)
 
@@ -138,7 +144,7 @@ class GoogleCloudFileStorage(BaseGoogleCloudClient):
                 "file": file_name,
                 "bucket": self.bucket_name,
                 "max_retries": max_retries,
-                "last_error": str(last_exception)
-            }
+                "last_error": str(last_exception),
+            },
         )
         raise TimeoutError(msg) from last_exception

src/knowledge_search_mcp/clients/vector_search.py

@@ -1,4 +1,3 @@
-# ruff: noqa: INP001
 """Google Cloud Vector Search client."""
 
 import asyncio
@@ -6,8 +5,9 @@ from collections.abc import Sequence
 
 from gcloud.aio.auth import Token
 
-from ..logging import log_structured_entry
-from ..models import SearchResult, SourceNamespace
+from knowledge_search_mcp.logging import log_structured_entry
+from knowledge_search_mcp.models import SearchResult, SourceNamespace
+
 from .base import BaseGoogleCloudClient
 from .storage import GoogleCloudFileStorage
 
@@ -94,7 +94,7 @@ class GoogleCloudVectorSearch(BaseGoogleCloudClient):
             log_structured_entry(
                 "Vector search query failed - endpoint not configured",
                 "ERROR",
-                {"error": msg}
+                {"error": msg},
             )
             raise RuntimeError(msg)
 
@@ -113,8 +113,8 @@ class GoogleCloudVectorSearch(BaseGoogleCloudClient):
                 "deployed_index_id": deployed_index_id,
                 "neighbor_count": limit,
                 "endpoint_id": endpoint_id,
-                "embedding_dimension": len(query)
-            }
+                "embedding_dimension": len(query),
+            },
         )
 
         datapoint: dict = {"feature_vector": list(query)}
@@ -149,10 +149,10 @@ class GoogleCloudVectorSearch(BaseGoogleCloudClient):
                         {
                             "status": response.status,
                             "response_body": body,
-                            "deployed_index_id": deployed_index_id
-                        }
+                            "deployed_index_id": deployed_index_id,
+                        },
                     )
-                    raise RuntimeError(msg)
+                    raise RuntimeError(msg)  # noqa: TRY301
                 data = await response.json()
 
             neighbors = data.get("nearestNeighbors", [{}])[0].get("neighbors", [])
@@ -161,15 +161,15 @@ class GoogleCloudVectorSearch(BaseGoogleCloudClient):
                 "INFO",
                 {
                     "neighbors_found": len(neighbors),
-                    "deployed_index_id": deployed_index_id
-                }
+                    "deployed_index_id": deployed_index_id,
+                },
             )
 
             if not neighbors:
                 log_structured_entry(
                     "No neighbors found in vector search",
                     "WARNING",
-                    {"deployed_index_id": deployed_index_id}
+                    {"deployed_index_id": deployed_index_id},
                 )
                 return []
 
@@ -185,7 +185,7 @@ class GoogleCloudVectorSearch(BaseGoogleCloudClient):
             log_structured_entry(
                 "Fetching content for search results",
                 "INFO",
-                {"file_count": len(content_tasks)}
+                {"file_count": len(content_tasks)},
             )
 
             file_streams = await asyncio.gather(*content_tasks)
@@ -206,12 +206,9 @@ class GoogleCloudVectorSearch(BaseGoogleCloudClient):
             log_structured_entry(
                 "Vector search completed successfully",
                 "INFO",
-                {
-                    "results_count": len(results),
-                    "deployed_index_id": deployed_index_id
-                }
+                {"results_count": len(results), "deployed_index_id": deployed_index_id},
             )
-            return results
+            return results  # noqa: TRY300
 
         except Exception as e:
             log_structured_entry(
@@ -220,7 +217,7 @@ class GoogleCloudVectorSearch(BaseGoogleCloudClient):
                 {
                     "error": str(e),
                     "error_type": type(e).__name__,
-                    "deployed_index_id": deployed_index_id
-                }
+                    "deployed_index_id": deployed_index_id,
+                },
             )
             raise

src/knowledge_search_mcp/config.py

@@ -1,7 +1,14 @@
+"""Configuration management for the MCP server."""
+
+import argparse
 import os
 import sys
-import argparse
-from pydantic_settings import BaseSettings, PydanticBaseSettingsSource, YamlConfigSettingsSource
+
+from pydantic_settings import (
+    BaseSettings,
+    PydanticBaseSettingsSource,
+    YamlConfigSettingsSource,
+)
 
 
 def _parse_args() -> argparse.Namespace:
@@ -14,7 +21,7 @@ def _parse_args() -> argparse.Namespace:
         parser = argparse.ArgumentParser()
         return argparse.Namespace(
             transport="stdio",
-            host="0.0.0.0",
+            host="0.0.0.0",  # noqa: S104
             port=8080,
             config=os.environ.get("CONFIG_FILE", "config.yaml"),
         )
@@ -25,7 +32,7 @@ def _parse_args() -> argparse.Namespace:
         choices=["stdio", "sse", "streamable-http"],
         default="stdio",
     )
-    parser.add_argument("--host", default="0.0.0.0")
+    parser.add_argument("--host", default="0.0.0.0")  # noqa: S104
     parser.add_argument("--port", type=int, default=8080)
     parser.add_argument(
         "--config",
@@ -36,6 +43,7 @@ def _parse_args() -> argparse.Namespace:
 
 _args = _parse_args()
 
+
 class Settings(BaseSettings):
     """Server configuration populated from env vars and a YAML config file."""
 
@@ -52,6 +60,14 @@ class Settings(BaseSettings):
     search_limit: int = 10
     log_name: str = "va_agent_evaluation_logs"
     log_level: str = "INFO"
+    cloud_logging_enabled: bool = False
+
+    # Semantic cache (Redis)
+    redis_url: str | None = None
+    cache_name: str = "knowledge_search_cache"
+    cache_vector_dims: int = 3072
+    cache_distance_threshold: float = 0.12
+    cache_ttl: int | None = 3600
 
     @classmethod
     def settings_customise_sources(
@@ -62,6 +78,7 @@ class Settings(BaseSettings):
         dotenv_settings: PydanticBaseSettingsSource,
         file_secret_settings: PydanticBaseSettingsSource,
     ) -> tuple[PydanticBaseSettingsSource, ...]:
+        """Customize the order of settings sources to include YAML config."""
         return (
             init_settings,
             env_settings,
@@ -77,7 +94,7 @@ _cfg: Settings | None = None
 
 def get_config() -> Settings:
     """Get or create the singleton Settings instance."""
-    global _cfg
+    global _cfg  # noqa: PLW0603
     if _cfg is None:
         _cfg = Settings.model_validate({})
     return _cfg
@@ -87,8 +104,8 @@ def get_config() -> Settings:
 class _ConfigProxy:
     """Proxy object that lazily loads config on attribute access."""
 
-    def __getattr__(self, name: str):
+    def __getattr__(self, name: str) -> object:
         return getattr(get_config(), name)
 
 
-cfg = _ConfigProxy()  # type: ignore[assignment]
+cfg = _ConfigProxy()

src/knowledge_search_mcp/logging.py

@@ -1,23 +1,22 @@
-"""
-Centralized Cloud Logging setup.
-Uses CloudLoggingHandler (background thread) so logging does not add latency
+"""Centralized Cloud Logging setup.
+
+Uses CloudLoggingHandler (background thread) so logging does not add latency.
 """
 
 import logging
-from typing import Optional, Dict, Literal
+from typing import Literal
 
 import google.cloud.logging
 from google.cloud.logging.handlers import CloudLoggingHandler
 
 from .config import get_config
 
-
 _eval_log: logging.Logger | None = None
 
 
 def _get_logger() -> logging.Logger:
     """Get or create the singleton evaluation logger."""
-    global _eval_log
+    global _eval_log  # noqa: PLW0603
     if _eval_log is not None:
         return _eval_log
 
@@ -27,30 +26,42 @@ def _get_logger() -> logging.Logger:
         _eval_log = logger
         return logger
 
+    if cfg.cloud_logging_enabled:
         try:
             client = google.cloud.logging.Client(project=cfg.project_id)
             handler = CloudLoggingHandler(client, name=cfg.log_name)  # async transport
             logger.addHandler(handler)
             logger.setLevel(getattr(logging, cfg.log_level.upper()))
-    except Exception as e:
+        except Exception as e:  # noqa: BLE001
             # Fallback to console if Cloud Logging is unavailable (local dev)
             logging.basicConfig(level=getattr(logging, cfg.log_level.upper()))
             logger = logging.getLogger(cfg.log_name)
             logger.warning("Cloud Logging setup failed; using console. Error: %s", e)
+    else:
+        logging.basicConfig(level=getattr(logging, cfg.log_level.upper()))
+        logger = logging.getLogger(cfg.log_name)
 
     _eval_log = logger
     return logger
 
 
-def log_structured_entry(message: str, severity: Literal["INFO", "WARNING", "ERROR"], custom_log: Optional[Dict] = None) -> None:
-    """
-    Emit a JSON-structured log row.
+def log_structured_entry(
+    message: str,
+    severity: Literal["INFO", "WARNING", "ERROR"],
+    custom_log: dict | None = None,
+) -> None:
+    """Emit a JSON-structured log row.
 
     Args:
         message: Short label for the row (e.g., "Final agent turn").
         severity: "INFO" | "WARNING" | "ERROR"
         custom_log: A dict with your structured payload.
+
     """
     level = getattr(logging, severity.upper(), logging.INFO)
     logger = _get_logger()
-    logger.log(level, message, extra={"json_fields": {"message": message, "custom": custom_log or {}}})
+    logger.log(
+        level,
+        message,
+        extra={"json_fields": {"message": message, "custom": custom_log or {}}},
+    )

src/knowledge_search_mcp/models.py

@@ -1,8 +1,7 @@
-# ruff: noqa: INP001
 """Domain models for knowledge search MCP server."""
 
 from dataclasses import dataclass
-from enum import Enum
+from enum import StrEnum
 from typing import TYPE_CHECKING, TypedDict
 
 if TYPE_CHECKING:
@@ -10,9 +9,10 @@ if TYPE_CHECKING:
 
     from .clients.vector_search import GoogleCloudVectorSearch
     from .config import Settings
+    from .services.semantic_cache import KnowledgeSemanticCache
 
 
-class SourceNamespace(str, Enum):
+class SourceNamespace(StrEnum):
     """Allowed values for the 'source' namespace filter."""
 
     EDUCACION_FINANCIERA = "Educacion Financiera"
@@ -35,3 +35,4 @@ class AppContext:
     vector_search: "GoogleCloudVectorSearch"
     genai_client: "genai.Client"
     settings: "Settings"
+    semantic_cache: "KnowledgeSemanticCache | None" = None

src/knowledge_search_mcp/server.py

@@ -1,4 +1,3 @@
-# ruff: noqa: INP001
 """MCP server lifecycle management."""
 
 from collections.abc import AsyncIterator
@@ -8,12 +7,13 @@ from google import genai
 from mcp.server.fastmcp import FastMCP
 
 from .clients.vector_search import GoogleCloudVectorSearch
-from .config import Settings, cfg
+from .config import get_config
 from .logging import log_structured_entry
 from .models import AppContext
+from .services.semantic_cache import KnowledgeSemanticCache
 from .services.validation import (
-    validate_genai_access,
     validate_gcs_access,
+    validate_genai_access,
     validate_vector_search_access,
 )
 
@@ -21,15 +21,18 @@ from .services.validation import (
 @asynccontextmanager
 async def lifespan(_server: FastMCP) -> AsyncIterator[AppContext]:
     """Create and configure the vector-search client for the server lifetime."""
+    # Get config with proper types for initialization
+    config_for_init = get_config()
+
     log_structured_entry(
         "Initializing MCP server",
         "INFO",
         {
-            "project_id": cfg.project_id,
-            "location": cfg.location,
-            "bucket": cfg.bucket,
-            "index_name": cfg.index_name,
-        }
+            "project_id": config_for_init.project_id,
+            "location": config_for_init.location,
+            "bucket": config_for_init.bucket,
+            "index_name": config_for_init.index_name,
+        },
     )
 
     vs: GoogleCloudVectorSearch | None = None
@@ -37,10 +40,10 @@ async def lifespan(_server: FastMCP) -> AsyncIterator[AppContext]:
         # Initialize vector search client
         log_structured_entry("Creating GoogleCloudVectorSearch client", "INFO")
         vs = GoogleCloudVectorSearch(
-            project_id=cfg.project_id,
-            location=cfg.location,
-            bucket=cfg.bucket,
-            index_name=cfg.index_name,
+            project_id=config_for_init.project_id,
+            location=config_for_init.location,
+            bucket=config_for_init.bucket,
+            index_name=config_for_init.index_name,
         )
 
         # Configure endpoint
@@ -48,25 +51,28 @@ async def lifespan(_server: FastMCP) -> AsyncIterator[AppContext]:
             "Configuring index endpoint",
             "INFO",
             {
-                "endpoint_name": cfg.endpoint_name,
-                "endpoint_domain": cfg.endpoint_domain,
-            }
+                "endpoint_name": config_for_init.endpoint_name,
+                "endpoint_domain": config_for_init.endpoint_domain,
+            },
         )
         vs.configure_index_endpoint(
-            name=cfg.endpoint_name,
-            public_domain=cfg.endpoint_domain,
+            name=config_for_init.endpoint_name,
+            public_domain=config_for_init.endpoint_domain,
         )
 
         # Initialize GenAI client
         log_structured_entry(
             "Creating GenAI client",
             "INFO",
-            {"project_id": cfg.project_id, "location": cfg.location}
+            {
+                "project_id": config_for_init.project_id,
+                "location": config_for_init.location,
+            },
         )
         genai_client = genai.Client(
             vertexai=True,
-            project=cfg.project_id,
-            location=cfg.location,
+            project=config_for_init.project_id,
+            location=config_for_init.location,
         )
 
         # Validate credentials and configuration by testing actual resources
@@ -76,32 +82,65 @@ async def lifespan(_server: FastMCP) -> AsyncIterator[AppContext]:
         validation_errors = []
 
         # Run all validations
-        genai_error = await validate_genai_access(genai_client, cfg)
+        config = get_config()
+        genai_error = await validate_genai_access(genai_client, config)
         if genai_error:
             validation_errors.append(genai_error)
 
-        gcs_error = await validate_gcs_access(vs, cfg)
+        gcs_error = await validate_gcs_access(vs, config)
         if gcs_error:
             validation_errors.append(gcs_error)
 
-        vs_error = await validate_vector_search_access(vs, cfg)
+        vs_error = await validate_vector_search_access(vs, config)
         if vs_error:
             validation_errors.append(vs_error)
 
         # Summary of validations
         if validation_errors:
             log_structured_entry(
-                "MCP server started with validation errors - service may not work correctly",
+                (
+                    "MCP server started with validation errors - "
+                    "service may not work correctly"
+                ),
                 "WARNING",
-                {"validation_errors": validation_errors, "error_count": len(validation_errors)}
+                {
+                    "validation_errors": validation_errors,
+                    "error_count": len(validation_errors),
+                },
             )
         else:
-            log_structured_entry("All validations passed - MCP server initialization complete", "INFO")
+            log_structured_entry(
+                "All validations passed - MCP server initialization complete", "INFO"
+            )
+
+        # Initialize semantic cache if Redis is configured
+        semantic_cache = None
+        if config_for_init.redis_url:
+            try:
+                semantic_cache = KnowledgeSemanticCache(
+                    redis_url=config_for_init.redis_url,
+                    name=config_for_init.cache_name,
+                    vector_dims=config_for_init.cache_vector_dims,
+                    distance_threshold=config_for_init.cache_distance_threshold,
+                    ttl=config_for_init.cache_ttl,
+                )
+                log_structured_entry(
+                    "Semantic cache initialized",
+                    "INFO",
+                    {"redis_url": config_for_init.redis_url, "cache_name": config_for_init.cache_name},
+                )
+            except Exception as e:
+                log_structured_entry(
+                    "Semantic cache initialization failed, continuing without cache",
+                    "WARNING",
+                    {"error": str(e), "error_type": type(e).__name__},
+                )
 
         yield AppContext(
             vector_search=vs,
             genai_client=genai_client,
-            settings=cfg,
+            settings=config,
+            semantic_cache=semantic_cache,
         )
 
     except Exception as e:
@@ -111,7 +150,7 @@ async def lifespan(_server: FastMCP) -> AsyncIterator[AppContext]:
             {
                 "error": str(e),
                 "error_type": type(e).__name__,
-            }
+            },
         )
         raise
     finally:
@@ -121,9 +160,9 @@ async def lifespan(_server: FastMCP) -> AsyncIterator[AppContext]:
             try:
                 await vs.close()
                 log_structured_entry("Closed aiohttp sessions", "INFO")
-            except Exception as e:
+            except Exception as e:  # noqa: BLE001
                 log_structured_entry(
                     "Error closing aiohttp sessions",
                     "WARNING",
-                    {"error": str(e), "error_type": type(e).__name__}
+                    {"error": str(e), "error_type": type(e).__name__},
                 )

src/knowledge_search_mcp/services/__init__.py

@@ -1,13 +1,21 @@
 """Service modules for business logic."""
 
-from .search import filter_search_results, format_search_results, generate_query_embedding
-from .validation import validate_genai_access, validate_gcs_access, validate_vector_search_access
+from .search import (
+    filter_search_results,
+    format_search_results,
+    generate_query_embedding,
+)
+from .validation import (
+    validate_gcs_access,
+    validate_genai_access,
+    validate_vector_search_access,
+)
 
 __all__ = [
     "filter_search_results",
     "format_search_results",
     "generate_query_embedding",
-    "validate_genai_access",
     "validate_gcs_access",
+    "validate_genai_access",
     "validate_vector_search_access",
 ]

src/knowledge_search_mcp/services/search.py

@@ -1,11 +1,10 @@
-# ruff: noqa: INP001
 """Search helper functions."""
 
 from google import genai
 from google.genai import types as genai_types
 
-from ..logging import log_structured_entry
-from ..models import SearchResult
+from knowledge_search_mcp.logging import log_structured_entry
+from knowledge_search_mcp.models import SearchResult
 
 
 async def generate_query_embedding(
@@ -17,6 +16,7 @@ async def generate_query_embedding(
 
     Returns:
         Tuple of (embedding vector, error message). Error message is None on success.
+
     """
     if not query or not query.strip():
         return ([], "Error: Query cannot be empty")
@@ -30,9 +30,11 @@ async def generate_query_embedding(
                 task_type="RETRIEVAL_QUERY",
             ),
         )
+        if not response.embeddings or not response.embeddings[0].values:
+            return ([], "Error: Failed to generate embedding - empty response")
         embedding = response.embeddings[0].values
-        return (embedding, None)
-    except Exception as e:
+        return (embedding, None)  # noqa: TRY300
+    except Exception as e:  # noqa: BLE001
         error_type = type(e).__name__
         error_msg = str(e)
 
@@ -41,22 +43,13 @@ async def generate_query_embedding(
             log_structured_entry(
                 "Rate limit exceeded while generating embedding",
                 "WARNING",
-                {
-                    "error": error_msg,
-                    "error_type": error_type,
-                    "query": query[:100]
-                }
+                {"error": error_msg, "error_type": error_type, "query": query[:100]},
             )
             return ([], "Error: API rate limit exceeded. Please try again later.")
-        else:
         log_structured_entry(
             "Failed to generate query embedding",
             "ERROR",
-                {
-                    "error": error_msg,
-                    "error_type": error_type,
-                    "query": query[:100]
-                }
+            {"error": error_msg, "error_type": error_type, "query": query[:100]},
         )
         return ([], f"Error generating embedding: {error_msg}")
 
@@ -75,6 +68,7 @@ def filter_search_results(
 
     Returns:
         Filtered list of search results.
+
     """
     if not results:
         return []
@@ -82,14 +76,10 @@ def filter_search_results(
     max_sim = max(r["distance"] for r in results)
     cutoff = max_sim * top_percent
 
-    filtered = [
-        s
-        for s in results
-        if s["distance"] > cutoff and s["distance"] > min_similarity
+    return [
+        s for s in results if s["distance"] > cutoff and s["distance"] > min_similarity
     ]
 
-    return filtered
-
 
 def format_search_results(results: list[SearchResult]) -> str:
     """Format search results as XML-like documents.
@@ -99,6 +89,7 @@ def format_search_results(results: list[SearchResult]) -> str:
 
     Returns:
         Formatted string with document tags.
+
     """
     if not results:
         return "No relevant documents found for your query."

src/knowledge_search_mcp/services/semantic_cache.py

@@ -0,0 +1,97 @@
+# ruff: noqa: INP001
+"""Semantic cache backed by Redis for knowledge search results."""
+
+from redisvl.extensions.cache.llm.semantic import SemanticCache
+from redisvl.utils.vectorize.custom import CustomVectorizer
+
+from ..logging import log_structured_entry
+
+
+def _stub_embed(content: object) -> list[float]:
+    """Stub vectorizer so SemanticCache creates an index with the right dims.
+
+    Never called at runtime — we always pass pre-computed vectors to
+    ``acheck`` and ``astore``.  Only invoked once by ``CustomVectorizer``
+    at init time to discover the dimensionality.
+    """
+    return [0.0] * _stub_embed.dims  # type: ignore[attr-defined]
+
+
+class KnowledgeSemanticCache:
+    """Thin wrapper around RedisVL SemanticCache with FLAT indexing."""
+
+    def __init__(
+        self,
+        redis_url: str,
+        name: str = "knowledge_search_cache",
+        vector_dims: int = 3072,
+        distance_threshold: float = 0.12,
+        ttl: int | None = 3600,
+    ) -> None:
+        _stub_embed.dims = vector_dims  # type: ignore[attr-defined]
+        vectorizer = CustomVectorizer(embed=_stub_embed)
+
+        self._cache = SemanticCache(
+            name=name,
+            distance_threshold=distance_threshold,
+            ttl=ttl,
+            redis_url=redis_url,
+            vectorizer=vectorizer,
+            overwrite=False,
+        )
+        self._name = name
+
+    async def check(
+        self,
+        embedding: list[float],
+    ) -> str | None:
+        """Return cached response for a semantically similar query, or None."""
+        try:
+            results = await self._cache.acheck(
+                vector=embedding,
+                num_results=1,
+                return_fields=["response", "prompt", "vector_distance"],
+            )
+        except Exception as e:
+            log_structured_entry(
+                "Semantic cache check failed, skipping cache",
+                "WARNING",
+                {"error": str(e), "error_type": type(e).__name__},
+            )
+            return None
+
+        if not results:
+            return None
+
+        hit = results[0]
+        log_structured_entry(
+            "Semantic cache hit",
+            "INFO",
+            {
+                "vector_distance": hit.get("vector_distance"),
+                "original_prompt": hit.get("prompt", "")[:100],
+            },
+        )
+        return hit.get("response")
+
+    async def store(
+        self,
+        query: str,
+        response: str,
+        embedding: list[float],
+        metadata: dict | None = None,
+    ) -> None:
+        """Store a query/response pair in the cache."""
+        try:
+            await self._cache.astore(
+                prompt=query,
+                response=response,
+                vector=embedding,
+                metadata=metadata,
+            )
+        except Exception as e:
+            log_structured_entry(
+                "Semantic cache store failed",
+                "WARNING",
+                {"error": str(e), "error_type": type(e).__name__},
+            )

src/knowledge_search_mcp/services/validation.py

@@ -1,20 +1,26 @@
-# ruff: noqa: INP001
 """Validation functions for Google Cloud services."""
 
 from gcloud.aio.auth import Token
 from google import genai
 from google.genai import types as genai_types
 
-from ..clients.vector_search import GoogleCloudVectorSearch
-from ..config import Settings
-from ..logging import log_structured_entry
+from knowledge_search_mcp.clients.vector_search import GoogleCloudVectorSearch
+from knowledge_search_mcp.config import Settings
+from knowledge_search_mcp.logging import log_structured_entry
+
+# HTTP status codes
+HTTP_FORBIDDEN = 403
+HTTP_NOT_FOUND = 404
 
 
-async def validate_genai_access(genai_client: genai.Client, cfg: Settings) -> str | None:
+async def validate_genai_access(
+    genai_client: genai.Client, cfg: Settings
+) -> str | None:
     """Validate GenAI embedding access.
 
     Returns:
         Error message if validation fails, None if successful.
+
     """
     log_structured_entry("Validating GenAI embedding access", "INFO")
     try:
@@ -30,20 +36,26 @@ async def validate_genai_access(genai_client: genai.Client, cfg: Settings) -> st
             log_structured_entry(
                 "GenAI embedding validation successful",
                 "INFO",
-                {"embedding_dimension": len(embedding_values) if embedding_values else 0}
+                {
+                    "embedding_dimension": len(embedding_values)
+                    if embedding_values
+                    else 0
+                },
             )
             return None
-        else:
         msg = "Embedding validation returned empty response"
         log_structured_entry(msg, "WARNING")
-            return msg
-    except Exception as e:
+        return msg  # noqa: TRY300
+    except Exception as e:  # noqa: BLE001
         log_structured_entry(
-            "Failed to validate GenAI embedding access - service may not work correctly",
+            (
+                "Failed to validate GenAI embedding access - "
+                "service may not work correctly"
+            ),
             "WARNING",
-            {"error": str(e), "error_type": type(e).__name__}
+            {"error": str(e), "error_type": type(e).__name__},
         )
-        return f"GenAI: {str(e)}"
+        return f"GenAI: {e!s}"
 
 
 async def validate_gcs_access(vs: GoogleCloudVectorSearch, cfg: Settings) -> str | None:
@@ -51,14 +63,11 @@ async def validate_gcs_access(vs: GoogleCloudVectorSearch, cfg: Settings) -> str
 
     Returns:
         Error message if validation fails, None if successful.
+
     """
-    log_structured_entry(
-        "Validating GCS bucket access",
-        "INFO",
-        {"bucket": cfg.bucket}
-    )
+    log_structured_entry("Validating GCS bucket access", "INFO", {"bucket": cfg.bucket})
     try:
-        session = vs.storage._get_aio_session()
+        session = vs.storage._get_aio_session()  # noqa: SLF001
         token_obj = Token(
             session=session,
             scopes=["https://www.googleapis.com/auth/cloud-platform"],
@@ -70,102 +79,136 @@ async def validate_gcs_access(vs: GoogleCloudVectorSearch, cfg: Settings) -> str
             f"https://storage.googleapis.com/storage/v1/b/{cfg.bucket}/o?maxResults=1",
             headers=headers,
         ) as response:
-            if response.status == 403:
+            if response.status == HTTP_FORBIDDEN:
                 msg = f"Access denied to bucket '{cfg.bucket}'. Check permissions."
                 log_structured_entry(
-                    "GCS bucket validation failed - access denied - service may not work correctly",
+                    (
+                        "GCS bucket validation failed - access denied - "
+                        "service may not work correctly"
+                    ),
                     "WARNING",
-                    {"bucket": cfg.bucket, "status": response.status}
+                    {"bucket": cfg.bucket, "status": response.status},
                 )
                 return msg
-            elif response.status == 404:
+            if response.status == HTTP_NOT_FOUND:
                 msg = f"Bucket '{cfg.bucket}' not found. Check bucket name and project."
                 log_structured_entry(
-                    "GCS bucket validation failed - not found - service may not work correctly",
+                    (
+                        "GCS bucket validation failed - not found - "
+                        "service may not work correctly"
+                    ),
                     "WARNING",
-                    {"bucket": cfg.bucket, "status": response.status}
+                    {"bucket": cfg.bucket, "status": response.status},
                 )
                 return msg
-            elif not response.ok:
+            if not response.ok:
                 body = await response.text()
                 msg = f"Failed to access bucket '{cfg.bucket}': {response.status}"
                 log_structured_entry(
                     "GCS bucket validation failed - service may not work correctly",
                     "WARNING",
-                    {"bucket": cfg.bucket, "status": response.status, "response": body}
+                    {"bucket": cfg.bucket, "status": response.status, "response": body},
                 )
                 return msg
-            else:
             log_structured_entry(
-                    "GCS bucket validation successful",
-                    "INFO",
-                    {"bucket": cfg.bucket}
+                "GCS bucket validation successful", "INFO", {"bucket": cfg.bucket}
             )
             return None
-    except Exception as e:
+    except Exception as e:  # noqa: BLE001
         log_structured_entry(
             "Failed to validate GCS bucket access - service may not work correctly",
             "WARNING",
-            {"error": str(e), "error_type": type(e).__name__, "bucket": cfg.bucket}
+            {"error": str(e), "error_type": type(e).__name__, "bucket": cfg.bucket},
         )
-        return f"GCS: {str(e)}"
+        return f"GCS: {e!s}"
 
 
-async def validate_vector_search_access(vs: GoogleCloudVectorSearch, cfg: Settings) -> str | None:
+async def validate_vector_search_access(
+    vs: GoogleCloudVectorSearch, cfg: Settings
+) -> str | None:
     """Validate vector search endpoint access.
 
     Returns:
         Error message if validation fails, None if successful.
+
     """
     log_structured_entry(
         "Validating vector search endpoint access",
         "INFO",
-        {"endpoint_name": cfg.endpoint_name}
+        {"endpoint_name": cfg.endpoint_name},
     )
     try:
-        headers = await vs._async_get_auth_headers()
-        session = vs._get_aio_session()
+        headers = await vs._async_get_auth_headers()  # noqa: SLF001
+        session = vs._get_aio_session()  # noqa: SLF001
         endpoint_url = (
             f"https://{cfg.location}-aiplatform.googleapis.com/v1/{cfg.endpoint_name}"
         )
 
         async with session.get(endpoint_url, headers=headers) as response:
-            if response.status == 403:
-                msg = f"Access denied to endpoint '{cfg.endpoint_name}'. Check permissions."
+            if response.status == HTTP_FORBIDDEN:
+                msg = (
+                    f"Access denied to endpoint '{cfg.endpoint_name}'. "
+                    "Check permissions."
+                )
                 log_structured_entry(
-                    "Vector search endpoint validation failed - access denied - service may not work correctly",
+                    (
+                        "Vector search endpoint validation failed - "
+                        "access denied - service may not work correctly"
+                    ),
                     "WARNING",
-                    {"endpoint": cfg.endpoint_name, "status": response.status}
+                    {"endpoint": cfg.endpoint_name, "status": response.status},
                 )
                 return msg
-            elif response.status == 404:
-                msg = f"Endpoint '{cfg.endpoint_name}' not found. Check endpoint name and project."
+            if response.status == HTTP_NOT_FOUND:
+                msg = (
+                    f"Endpoint '{cfg.endpoint_name}' not found. "
+                    "Check endpoint name and project."
+                )
                 log_structured_entry(
-                    "Vector search endpoint validation failed - not found - service may not work correctly",
+                    (
+                        "Vector search endpoint validation failed - "
+                        "not found - service may not work correctly"
+                    ),
                     "WARNING",
-                    {"endpoint": cfg.endpoint_name, "status": response.status}
+                    {"endpoint": cfg.endpoint_name, "status": response.status},
                 )
                 return msg
-            elif not response.ok:
+            if not response.ok:
                 body = await response.text()
-                msg = f"Failed to access endpoint '{cfg.endpoint_name}': {response.status}"
+                msg = (
+                    f"Failed to access endpoint '{cfg.endpoint_name}': "
+                    f"{response.status}"
+                )
                 log_structured_entry(
-                    "Vector search endpoint validation failed - service may not work correctly",
+                    (
+                        "Vector search endpoint validation failed - "
+                        "service may not work correctly"
+                    ),
                     "WARNING",
-                    {"endpoint": cfg.endpoint_name, "status": response.status, "response": body}
+                    {
+                        "endpoint": cfg.endpoint_name,
+                        "status": response.status,
+                        "response": body,
+                    },
                 )
                 return msg
-            else:
             log_structured_entry(
                 "Vector search endpoint validation successful",
                 "INFO",
-                    {"endpoint": cfg.endpoint_name}
+                {"endpoint": cfg.endpoint_name},
             )
             return None
-    except Exception as e:
+    except Exception as e:  # noqa: BLE001
         log_structured_entry(
-            "Failed to validate vector search endpoint access - service may not work correctly",
+            (
+                "Failed to validate vector search endpoint access - "
+                "service may not work correctly"
+            ),
             "WARNING",
-            {"error": str(e), "error_type": type(e).__name__, "endpoint": cfg.endpoint_name}
+            {
+                "error": str(e),
+                "error_type": type(e).__name__,
+                "endpoint": cfg.endpoint_name,
+            },
         )
-        return f"Vector Search: {str(e)}"
+        return f"Vector Search: {e!s}"

src/knowledge_search_mcp/utils/cache.py

@@ -1,4 +1,3 @@
-# ruff: noqa: INP001
 """LRU cache implementation."""
 
 from collections import OrderedDict

tests/test_main_tool.py

@@ -28,6 +28,9 @@ class TestKnowledgeSearch:
         app.settings.deployed_index_id = "test-deployed-index"
         app.settings.search_limit = 10
 
+        # No semantic cache by default
+        app.semantic_cache = None
+
         return app
 
     @pytest.fixture

tests/test_semantic_cache.py

@@ -0,0 +1,272 @@
+"""Tests for the semantic cache service and its integration."""
+
+import pytest
+from unittest.mock import AsyncMock, MagicMock, patch
+
+from knowledge_search_mcp.__main__ import knowledge_search
+from knowledge_search_mcp.models import AppContext, SearchResult, SourceNamespace
+from knowledge_search_mcp.services.semantic_cache import KnowledgeSemanticCache
+
+
+class TestKnowledgeSemanticCache:
+    """Unit tests for the KnowledgeSemanticCache wrapper."""
+
+    @patch("knowledge_search_mcp.services.semantic_cache.CustomVectorizer")
+    @patch("knowledge_search_mcp.services.semantic_cache.SemanticCache")
+    def test_init_creates_cache(self, mock_sc_cls, mock_vec_cls):
+        """Test that __init__ creates the SemanticCache with correct params."""
+        mock_vectorizer = MagicMock()
+        mock_vec_cls.return_value = mock_vectorizer
+
+        KnowledgeSemanticCache(
+            redis_url="redis://localhost:6379",
+            name="test_cache",
+            vector_dims=3072,
+            distance_threshold=0.12,
+            ttl=3600,
+        )
+
+        mock_vec_cls.assert_called_once()
+        mock_sc_cls.assert_called_once_with(
+            name="test_cache",
+            distance_threshold=0.12,
+            ttl=3600,
+            redis_url="redis://localhost:6379",
+            vectorizer=mock_vectorizer,
+            overwrite=False,
+        )
+
+    @patch("knowledge_search_mcp.services.semantic_cache.CustomVectorizer")
+    @patch("knowledge_search_mcp.services.semantic_cache.SemanticCache")
+    async def test_check_returns_response_on_hit(self, mock_sc_cls, _mock_vec_cls):
+        """Test cache check returns response when a similar vector is found."""
+        mock_inner = MagicMock()
+        mock_inner.acheck = AsyncMock(return_value=[
+            {"response": "cached answer", "prompt": "original q", "vector_distance": 0.05},
+        ])
+        mock_sc_cls.return_value = mock_inner
+
+        cache = KnowledgeSemanticCache(redis_url="redis://localhost:6379")
+        result = await cache.check([0.1] * 3072)
+
+        assert result == "cached answer"
+        mock_inner.acheck.assert_awaited_once_with(
+            vector=[0.1] * 3072,
+            num_results=1,
+        )
+
+    @patch("knowledge_search_mcp.services.semantic_cache.CustomVectorizer")
+    @patch("knowledge_search_mcp.services.semantic_cache.SemanticCache")
+    async def test_check_returns_none_on_miss(self, mock_sc_cls, _mock_vec_cls):
+        """Test cache check returns None when no similar vector is found."""
+        mock_inner = MagicMock()
+        mock_inner.acheck = AsyncMock(return_value=[])
+        mock_sc_cls.return_value = mock_inner
+
+        cache = KnowledgeSemanticCache(redis_url="redis://localhost:6379")
+        result = await cache.check([0.1] * 3072)
+
+        assert result is None
+
+    @patch("knowledge_search_mcp.services.semantic_cache.CustomVectorizer")
+    @patch("knowledge_search_mcp.services.semantic_cache.SemanticCache")
+    async def test_check_returns_none_on_error(self, mock_sc_cls, _mock_vec_cls):
+        """Test cache check degrades gracefully on Redis errors."""
+        mock_inner = MagicMock()
+        mock_inner.acheck = AsyncMock(side_effect=ConnectionError("Redis down"))
+        mock_sc_cls.return_value = mock_inner
+
+        cache = KnowledgeSemanticCache(redis_url="redis://localhost:6379")
+        result = await cache.check([0.1] * 3072)
+
+        assert result is None
+
+    @patch("knowledge_search_mcp.services.semantic_cache.CustomVectorizer")
+    @patch("knowledge_search_mcp.services.semantic_cache.SemanticCache")
+    async def test_store_calls_astore(self, mock_sc_cls, _mock_vec_cls):
+        """Test store delegates to SemanticCache.astore."""
+        mock_inner = MagicMock()
+        mock_inner.astore = AsyncMock()
+        mock_sc_cls.return_value = mock_inner
+
+        cache = KnowledgeSemanticCache(redis_url="redis://localhost:6379")
+        await cache.store("query", "response", [0.1] * 3072, {"key": "val"})
+
+        mock_inner.astore.assert_awaited_once_with(
+            prompt="query",
+            response="response",
+            vector=[0.1] * 3072,
+            metadata={"key": "val"},
+        )
+
+    @patch("knowledge_search_mcp.services.semantic_cache.CustomVectorizer")
+    @patch("knowledge_search_mcp.services.semantic_cache.SemanticCache")
+    async def test_store_does_not_raise_on_error(self, mock_sc_cls, _mock_vec_cls):
+        """Test store degrades gracefully on Redis errors."""
+        mock_inner = MagicMock()
+        mock_inner.astore = AsyncMock(side_effect=ConnectionError("Redis down"))
+        mock_sc_cls.return_value = mock_inner
+
+        cache = KnowledgeSemanticCache(redis_url="redis://localhost:6379")
+        await cache.store("query", "response", [0.1] * 3072)
+
+
+class TestKnowledgeSearchCacheIntegration:
+    """Tests for cache integration in the knowledge_search tool."""
+
+    @pytest.fixture
+    def mock_cache(self):
+        """Create a mock KnowledgeSemanticCache."""
+        cache = MagicMock(spec=KnowledgeSemanticCache)
+        cache.check = AsyncMock(return_value=None)
+        cache.store = AsyncMock()
+        return cache
+
+    @pytest.fixture
+    def mock_app_context(self, mock_cache):
+        """Create a mock AppContext with semantic cache."""
+        app = MagicMock(spec=AppContext)
+        app.genai_client = MagicMock()
+        app.vector_search = MagicMock()
+        app.vector_search.async_run_query = AsyncMock()
+        app.settings = MagicMock()
+        app.settings.embedding_model = "gemini-embedding-001"
+        app.settings.deployed_index_id = "test-deployed-index"
+        app.settings.search_limit = 10
+        app.semantic_cache = mock_cache
+        return app
+
+    @pytest.fixture
+    def mock_context(self, mock_app_context):
+        """Create a mock MCP Context."""
+        ctx = MagicMock()
+        ctx.request_context.lifespan_context = mock_app_context
+        return ctx
+
+    @pytest.fixture
+    def sample_embedding(self):
+        return [0.1] * 3072
+
+    @pytest.fixture
+    def sample_results(self) -> list[SearchResult]:
+        return [
+            {"id": "doc1", "distance": 0.95, "content": "Content 1"},
+            {"id": "doc2", "distance": 0.90, "content": "Content 2"},
+        ]
+
+    @patch("knowledge_search_mcp.__main__.generate_query_embedding")
+    async def test_cache_hit_skips_vector_search(
+        self, mock_generate, mock_context, sample_embedding, mock_cache
+    ):
+        """On cache hit, vector search is never called."""
+        mock_generate.return_value = (sample_embedding, None)
+        mock_cache.check.return_value = "cached result"
+
+        result = await knowledge_search("test query", mock_context)
+
+        assert result == "cached result"
+        mock_cache.check.assert_awaited_once_with(sample_embedding)
+        mock_context.request_context.lifespan_context.vector_search.async_run_query.assert_not_called()
+        mock_cache.store.assert_not_awaited()
+
+    @patch("knowledge_search_mcp.__main__.generate_query_embedding")
+    @patch("knowledge_search_mcp.__main__.filter_search_results")
+    @patch("knowledge_search_mcp.__main__.format_search_results")
+    async def test_cache_miss_stores_result(
+        self,
+        mock_format,
+        mock_filter,
+        mock_generate,
+        mock_context,
+        sample_embedding,
+        sample_results,
+        mock_cache,
+    ):
+        """On cache miss, results are fetched and stored in cache."""
+        mock_generate.return_value = (sample_embedding, None)
+        mock_cache.check.return_value = None
+        mock_context.request_context.lifespan_context.vector_search.async_run_query.return_value = sample_results
+        mock_filter.return_value = sample_results
+        mock_format.return_value = "formatted results"
+
+        result = await knowledge_search("test query", mock_context)
+
+        assert result == "formatted results"
+        mock_cache.check.assert_awaited_once_with(sample_embedding)
+        mock_cache.store.assert_awaited_once_with(
+            "test query", "formatted results", sample_embedding,
+        )
+
+    @patch("knowledge_search_mcp.__main__.generate_query_embedding")
+    @patch("knowledge_search_mcp.__main__.filter_search_results")
+    @patch("knowledge_search_mcp.__main__.format_search_results")
+    async def test_cache_skipped_when_source_filter_set(
+        self,
+        mock_format,
+        mock_filter,
+        mock_generate,
+        mock_context,
+        sample_embedding,
+        sample_results,
+        mock_cache,
+    ):
+        """Cache is bypassed when a source filter is specified."""
+        mock_generate.return_value = (sample_embedding, None)
+        mock_context.request_context.lifespan_context.vector_search.async_run_query.return_value = sample_results
+        mock_filter.return_value = sample_results
+        mock_format.return_value = "formatted results"
+
+        result = await knowledge_search(
+            "test query", mock_context, source=SourceNamespace.EDUCACION_FINANCIERA,
+        )
+
+        assert result == "formatted results"
+        mock_cache.check.assert_not_awaited()
+        mock_cache.store.assert_not_awaited()
+
+    @patch("knowledge_search_mcp.__main__.generate_query_embedding")
+    @patch("knowledge_search_mcp.__main__.filter_search_results")
+    @patch("knowledge_search_mcp.__main__.format_search_results")
+    async def test_cache_not_stored_when_no_results(
+        self,
+        mock_format,
+        mock_filter,
+        mock_generate,
+        mock_context,
+        sample_embedding,
+        mock_cache,
+    ):
+        """Empty results are not stored in the cache."""
+        mock_generate.return_value = (sample_embedding, None)
+        mock_cache.check.return_value = None
+        mock_context.request_context.lifespan_context.vector_search.async_run_query.return_value = []
+        mock_filter.return_value = []
+        mock_format.return_value = "No relevant documents found for your query."
+
+        result = await knowledge_search("test query", mock_context)
+
+        assert result == "No relevant documents found for your query."
+        mock_cache.store.assert_not_awaited()
+
+    @patch("knowledge_search_mcp.__main__.generate_query_embedding")
+    @patch("knowledge_search_mcp.__main__.filter_search_results")
+    @patch("knowledge_search_mcp.__main__.format_search_results")
+    async def test_works_without_cache(
+        self,
+        mock_format,
+        mock_filter,
+        mock_generate,
+        mock_context,
+        sample_embedding,
+        sample_results,
+    ):
+        """Tool works normally when semantic_cache is None."""
+        mock_generate.return_value = (sample_embedding, None)
+        mock_context.request_context.lifespan_context.semantic_cache = None
+        mock_context.request_context.lifespan_context.vector_search.async_run_query.return_value = sample_results
+        mock_filter.return_value = sample_results
+        mock_format.return_value = "formatted results"
+
+        result = await knowledge_search("test query", mock_context)
+
+        assert result == "formatted results"

uv.lock

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