feat(knowledge-base): implement Knowledge Base MCP Server (#57)
Implements RAG capabilities with pgvector for semantic search: - Intelligent chunking strategies (code-aware, markdown-aware, text) - Semantic search with vector similarity (HNSW index) - Keyword search with PostgreSQL full-text search - Hybrid search using Reciprocal Rank Fusion (RRF) - Redis caching for embeddings - Collection management (ingest, search, delete, stats) - FastMCP tools: search_knowledge, ingest_content, delete_content, list_collections, get_collection_stats, update_document Testing: - 128 comprehensive tests covering all components - 58% code coverage (database integration tests use mocks) - Passes ruff linting and mypy type checking 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
@@ -1,162 +1,569 @@
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"""
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Syndarix Knowledge Base MCP Server.
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Knowledge Base MCP Server.
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Provides RAG capabilities with:
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- pgvector for semantic search
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- Per-project collection isolation
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- Hybrid search (vector + keyword)
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- Chunking strategies for code, markdown, and text
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Per ADR-008: Knowledge Base RAG Architecture.
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Provides RAG capabilities with pgvector for semantic search,
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intelligent chunking, and collection management.
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"""
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import os
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import logging
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from contextlib import asynccontextmanager
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from typing import Any
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from fastapi import FastAPI
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from fastmcp import FastMCP
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from pydantic import Field
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# Create MCP server
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mcp = FastMCP(
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"syndarix-knowledge-base",
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from collection_manager import CollectionManager, get_collection_manager
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from collections.abc import AsyncIterator
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from config import get_settings
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from database import DatabaseManager, get_database_manager
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from embeddings import EmbeddingGenerator, get_embedding_generator
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from exceptions import KnowledgeBaseError
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from models import (
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ChunkType,
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DeleteRequest,
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FileType,
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IngestRequest,
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SearchRequest,
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SearchType,
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)
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from search import SearchEngine, get_search_engine
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# Configure logging
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logging.basicConfig(
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level=logging.INFO,
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format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
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)
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logger = logging.getLogger(__name__)
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# Global instances
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_database: DatabaseManager | None = None
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_embeddings: EmbeddingGenerator | None = None
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_search: SearchEngine | None = None
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_collections: CollectionManager | None = None
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@asynccontextmanager
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async def lifespan(_app: FastAPI) -> AsyncIterator[None]:
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"""Application lifespan handler."""
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global _database, _embeddings, _search, _collections
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logger.info("Starting Knowledge Base MCP Server...")
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# Initialize database
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_database = get_database_manager()
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await _database.initialize()
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# Initialize embedding generator
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_embeddings = get_embedding_generator()
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await _embeddings.initialize()
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# Initialize search engine
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_search = get_search_engine()
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# Initialize collection manager
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_collections = get_collection_manager()
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logger.info("Knowledge Base MCP Server started successfully")
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yield
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# Cleanup
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logger.info("Shutting down Knowledge Base MCP Server...")
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if _embeddings:
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await _embeddings.close()
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if _database:
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await _database.close()
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logger.info("Knowledge Base MCP Server shut down")
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# Create FastMCP server
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mcp = FastMCP("syndarix-knowledge-base")
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# Create FastAPI app with lifespan
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app = FastAPI(
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title="Knowledge Base MCP Server",
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description="RAG with pgvector for semantic search",
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version="0.1.0",
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lifespan=lifespan,
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)
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# Configuration
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DATABASE_URL = os.getenv("DATABASE_URL")
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REDIS_URL = os.getenv("REDIS_URL", "redis://localhost:6379/0")
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@app.get("/health")
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async def health_check() -> dict[str, Any]:
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"""Health check endpoint."""
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status: dict[str, Any] = {
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"status": "healthy",
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"service": "knowledge-base",
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"version": "0.1.0",
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}
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# Check database connection
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try:
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if _database and _database._pool:
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async with _database.acquire() as conn:
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await conn.fetchval("SELECT 1")
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status["database"] = "connected"
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else:
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status["database"] = "not initialized"
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except Exception as e:
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status["database"] = f"error: {e}"
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status["status"] = "degraded"
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return status
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# MCP Tools
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@mcp.tool()
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async def search_knowledge(
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project_id: str,
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query: str,
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top_k: int = 10,
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search_type: str = "hybrid",
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filters: dict | None = None,
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) -> dict:
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project_id: str = Field(..., description="Project ID for scoping"),
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agent_id: str = Field(..., description="Agent ID making the request"),
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query: str = Field(..., description="Search query"),
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search_type: str = Field(
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default="hybrid",
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description="Search type: semantic, keyword, or hybrid",
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),
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collection: str | None = Field(
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default=None,
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description="Collection to search (None = all)",
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),
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limit: int = Field(
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default=10,
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ge=1,
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le=100,
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description="Maximum number of results",
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),
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threshold: float = Field(
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default=0.7,
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ge=0.0,
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le=1.0,
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description="Minimum similarity score",
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),
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file_types: list[str] | None = Field(
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default=None,
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description="Filter by file types (python, javascript, etc.)",
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),
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) -> dict[str, Any]:
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"""
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Search the project knowledge base.
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Search the knowledge base for relevant content.
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Args:
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project_id: UUID of the project (scopes to project collection)
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query: Search query text
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top_k: Number of results to return
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search_type: Search type (semantic, keyword, hybrid)
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filters: Optional filters (file_type, path_prefix, etc.)
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Returns:
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List of matching documents with scores
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Supports semantic (vector), keyword (full-text), and hybrid search.
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Returns chunks ranked by relevance to the query.
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"""
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# TODO: Implement pgvector search
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# 1. Generate query embedding via LLM Gateway
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# 2. Search project-scoped collection
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# 3. Apply filters
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# 4. Return results with scores
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return {
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"status": "not_implemented",
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"project_id": project_id,
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"query": query,
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}
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try:
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# Parse search type
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try:
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search_type_enum = SearchType(search_type.lower())
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except ValueError:
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valid_types = [t.value for t in SearchType]
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return {
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"success": False,
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"error": f"Invalid search type: {search_type}. Valid types: {valid_types}",
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}
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# Parse file types
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file_type_enums = None
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if file_types:
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try:
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file_type_enums = [FileType(ft.lower()) for ft in file_types]
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except ValueError as e:
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return {
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"success": False,
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"error": f"Invalid file type: {e}",
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}
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request = SearchRequest(
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project_id=project_id,
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agent_id=agent_id,
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query=query,
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search_type=search_type_enum,
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collection=collection,
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limit=limit,
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threshold=threshold,
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file_types=file_type_enums,
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)
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response = await _search.search(request) # type: ignore[union-attr]
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return {
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"success": True,
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"query": response.query,
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"search_type": response.search_type,
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"results": [
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{
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"id": r.id,
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"content": r.content,
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"score": r.score,
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"source_path": r.source_path,
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"start_line": r.start_line,
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"end_line": r.end_line,
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"chunk_type": r.chunk_type,
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"file_type": r.file_type,
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"collection": r.collection,
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"metadata": r.metadata,
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}
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for r in response.results
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],
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"total_results": response.total_results,
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"search_time_ms": response.search_time_ms,
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}
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except KnowledgeBaseError as e:
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logger.error(f"Search error: {e}")
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return {
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"success": False,
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"error": e.message,
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"code": e.code.value,
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}
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except Exception as e:
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logger.error(f"Unexpected search error: {e}")
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return {
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"success": False,
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"error": str(e),
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}
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@mcp.tool()
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async def ingest_document(
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project_id: str,
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content: str,
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source_path: str,
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doc_type: str = "text",
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metadata: dict | None = None,
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) -> dict:
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async def ingest_content(
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project_id: str = Field(..., description="Project ID for scoping"),
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agent_id: str = Field(..., description="Agent ID making the request"),
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content: str = Field(..., description="Content to ingest"),
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source_path: str | None = Field(
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default=None,
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description="Source file path for reference",
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),
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collection: str = Field(
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default="default",
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description="Collection to store in",
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),
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chunk_type: str = Field(
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default="text",
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description="Content type: code, markdown, or text",
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),
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file_type: str | None = Field(
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default=None,
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description="File type for code chunking (python, javascript, etc.)",
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),
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metadata: dict[str, Any] | None = Field(
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default=None,
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description="Additional metadata to store",
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),
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) -> dict[str, Any]:
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"""
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Ingest a document into the knowledge base.
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Ingest content into the knowledge base.
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Args:
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project_id: UUID of the project
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content: Document content
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source_path: Original file path for reference
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doc_type: Document type (code, markdown, text)
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metadata: Additional metadata
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Returns:
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Ingestion result with chunk count
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Content is automatically chunked based on type, embedded using
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the LLM Gateway, and stored in pgvector for search.
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"""
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# TODO: Implement document ingestion
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# 1. Apply chunking strategy based on doc_type
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# 2. Generate embeddings for chunks
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# 3. Store in project collection
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return {
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"status": "not_implemented",
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"project_id": project_id,
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"source_path": source_path,
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}
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try:
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# Parse chunk type
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try:
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chunk_type_enum = ChunkType(chunk_type.lower())
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except ValueError:
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valid_types = [t.value for t in ChunkType]
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return {
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"success": False,
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"error": f"Invalid chunk type: {chunk_type}. Valid types: {valid_types}",
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}
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# Parse file type
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file_type_enum = None
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if file_type:
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try:
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file_type_enum = FileType(file_type.lower())
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except ValueError:
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valid_types = [t.value for t in FileType]
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return {
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"success": False,
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"error": f"Invalid file type: {file_type}. Valid types: {valid_types}",
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}
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request = IngestRequest(
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project_id=project_id,
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agent_id=agent_id,
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content=content,
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source_path=source_path,
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collection=collection,
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chunk_type=chunk_type_enum,
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file_type=file_type_enum,
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metadata=metadata or {},
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)
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result = await _collections.ingest(request) # type: ignore[union-attr]
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return {
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"success": result.success,
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"chunks_created": result.chunks_created,
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"embeddings_generated": result.embeddings_generated,
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"source_path": result.source_path,
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"collection": result.collection,
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"chunk_ids": result.chunk_ids,
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"error": result.error,
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}
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except KnowledgeBaseError as e:
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logger.error(f"Ingest error: {e}")
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return {
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"success": False,
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"error": e.message,
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"code": e.code.value,
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}
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except Exception as e:
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logger.error(f"Unexpected ingest error: {e}")
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return {
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"success": False,
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"error": str(e),
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}
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@mcp.tool()
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async def ingest_repository(
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project_id: str,
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repo_path: str,
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include_patterns: list[str] | None = None,
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exclude_patterns: list[str] | None = None,
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) -> dict:
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async def delete_content(
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project_id: str = Field(..., description="Project ID for scoping"),
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agent_id: str = Field(..., description="Agent ID making the request"),
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source_path: str | None = Field(
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default=None,
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description="Delete by source file path",
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),
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collection: str | None = Field(
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default=None,
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description="Delete entire collection",
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),
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chunk_ids: list[str] | None = Field(
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default=None,
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description="Delete specific chunk IDs",
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),
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) -> dict[str, Any]:
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"""
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Ingest an entire repository into the knowledge base.
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Delete content from the knowledge base.
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Args:
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project_id: UUID of the project
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repo_path: Path to the repository
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include_patterns: Glob patterns to include (e.g., ["*.py", "*.md"])
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exclude_patterns: Glob patterns to exclude (e.g., ["node_modules/*"])
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Returns:
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Ingestion summary with file and chunk counts
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Specify either source_path, collection, or chunk_ids to delete.
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"""
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# TODO: Implement repository ingestion
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return {
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"status": "not_implemented",
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"project_id": project_id,
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"repo_path": repo_path,
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}
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try:
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request = DeleteRequest(
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project_id=project_id,
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agent_id=agent_id,
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source_path=source_path,
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collection=collection,
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chunk_ids=chunk_ids,
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)
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result = await _collections.delete(request) # type: ignore[union-attr]
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return {
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"success": result.success,
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"chunks_deleted": result.chunks_deleted,
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"error": result.error,
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}
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except KnowledgeBaseError as e:
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logger.error(f"Delete error: {e}")
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return {
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"success": False,
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"error": e.message,
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"code": e.code.value,
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}
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except Exception as e:
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logger.error(f"Unexpected delete error: {e}")
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return {
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"success": False,
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"error": str(e),
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}
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@mcp.tool()
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async def delete_document(
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project_id: str,
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source_path: str,
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) -> dict:
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async def list_collections(
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project_id: str = Field(..., description="Project ID for scoping"),
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agent_id: str = Field(..., description="Agent ID making the request"), # noqa: ARG001
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) -> dict[str, Any]:
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"""
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Delete a document from the knowledge base.
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List all collections in a project's knowledge base.
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Args:
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project_id: UUID of the project
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source_path: Original file path
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Returns:
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Deletion result
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Returns collection names with chunk counts and file types.
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"""
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# TODO: Implement document deletion
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return {
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"status": "not_implemented",
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"project_id": project_id,
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"source_path": source_path,
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}
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try:
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result = await _collections.list_collections(project_id) # type: ignore[union-attr]
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return {
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"success": True,
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"project_id": result.project_id,
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"collections": [
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{
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"name": c.name,
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"chunk_count": c.chunk_count,
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"total_tokens": c.total_tokens,
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"file_types": c.file_types,
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"created_at": c.created_at.isoformat(),
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"updated_at": c.updated_at.isoformat(),
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}
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for c in result.collections
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],
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"total_collections": result.total_collections,
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}
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||||
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except KnowledgeBaseError as e:
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logger.error(f"List collections error: {e}")
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return {
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"success": False,
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"error": e.message,
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||||
"code": e.code.value,
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||||
}
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||||
except Exception as e:
|
||||
logger.error(f"Unexpected list collections error: {e}")
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||||
return {
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||||
"success": False,
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"error": str(e),
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||||
}
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||||
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||||
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||||
@mcp.tool()
|
||||
async def get_collection_stats(project_id: str) -> dict:
|
||||
async def get_collection_stats(
|
||||
project_id: str = Field(..., description="Project ID for scoping"),
|
||||
agent_id: str = Field(..., description="Agent ID making the request"), # noqa: ARG001
|
||||
collection: str = Field(..., description="Collection name"),
|
||||
) -> dict[str, Any]:
|
||||
"""
|
||||
Get statistics for a project's knowledge base collection.
|
||||
Get detailed statistics for a collection.
|
||||
|
||||
Args:
|
||||
project_id: UUID of the project
|
||||
|
||||
Returns:
|
||||
Collection statistics (document count, chunk count, etc.)
|
||||
Returns chunk counts, token totals, and type breakdowns.
|
||||
"""
|
||||
# TODO: Implement collection stats
|
||||
return {
|
||||
"status": "not_implemented",
|
||||
"project_id": project_id,
|
||||
}
|
||||
try:
|
||||
stats = await _collections.get_collection_stats(project_id, collection) # type: ignore[union-attr]
|
||||
|
||||
return {
|
||||
"success": True,
|
||||
"collection": stats.collection,
|
||||
"project_id": stats.project_id,
|
||||
"chunk_count": stats.chunk_count,
|
||||
"unique_sources": stats.unique_sources,
|
||||
"total_tokens": stats.total_tokens,
|
||||
"avg_chunk_size": stats.avg_chunk_size,
|
||||
"chunk_types": stats.chunk_types,
|
||||
"file_types": stats.file_types,
|
||||
"oldest_chunk": stats.oldest_chunk.isoformat() if stats.oldest_chunk else None,
|
||||
"newest_chunk": stats.newest_chunk.isoformat() if stats.newest_chunk else None,
|
||||
}
|
||||
|
||||
except KnowledgeBaseError as e:
|
||||
logger.error(f"Get collection stats error: {e}")
|
||||
return {
|
||||
"success": False,
|
||||
"error": e.message,
|
||||
"code": e.code.value,
|
||||
}
|
||||
except Exception as e:
|
||||
logger.error(f"Unexpected get collection stats error: {e}")
|
||||
return {
|
||||
"success": False,
|
||||
"error": str(e),
|
||||
}
|
||||
|
||||
|
||||
@mcp.tool()
|
||||
async def update_document(
|
||||
project_id: str = Field(..., description="Project ID for scoping"),
|
||||
agent_id: str = Field(..., description="Agent ID making the request"),
|
||||
source_path: str = Field(..., description="Source file path"),
|
||||
content: str = Field(..., description="New content"),
|
||||
collection: str = Field(
|
||||
default="default",
|
||||
description="Collection name",
|
||||
),
|
||||
chunk_type: str = Field(
|
||||
default="text",
|
||||
description="Content type: code, markdown, or text",
|
||||
),
|
||||
file_type: str | None = Field(
|
||||
default=None,
|
||||
description="File type for code chunking",
|
||||
),
|
||||
metadata: dict[str, Any] | None = Field(
|
||||
default=None,
|
||||
description="Additional metadata",
|
||||
),
|
||||
) -> dict[str, Any]:
|
||||
"""
|
||||
Update a document in the knowledge base.
|
||||
|
||||
Replaces all existing chunks for the source path with new content.
|
||||
"""
|
||||
try:
|
||||
# Parse chunk type
|
||||
try:
|
||||
chunk_type_enum = ChunkType(chunk_type.lower())
|
||||
except ValueError:
|
||||
valid_types = [t.value for t in ChunkType]
|
||||
return {
|
||||
"success": False,
|
||||
"error": f"Invalid chunk type: {chunk_type}. Valid types: {valid_types}",
|
||||
}
|
||||
|
||||
# Parse file type
|
||||
file_type_enum = None
|
||||
if file_type:
|
||||
try:
|
||||
file_type_enum = FileType(file_type.lower())
|
||||
except ValueError:
|
||||
valid_types = [t.value for t in FileType]
|
||||
return {
|
||||
"success": False,
|
||||
"error": f"Invalid file type: {file_type}. Valid types: {valid_types}",
|
||||
}
|
||||
|
||||
result = await _collections.update_document( # type: ignore[union-attr]
|
||||
project_id=project_id,
|
||||
agent_id=agent_id,
|
||||
source_path=source_path,
|
||||
content=content,
|
||||
collection=collection,
|
||||
chunk_type=chunk_type_enum,
|
||||
file_type=file_type_enum,
|
||||
metadata=metadata,
|
||||
)
|
||||
|
||||
return {
|
||||
"success": result.success,
|
||||
"chunks_created": result.chunks_created,
|
||||
"embeddings_generated": result.embeddings_generated,
|
||||
"source_path": result.source_path,
|
||||
"collection": result.collection,
|
||||
"chunk_ids": result.chunk_ids,
|
||||
"error": result.error,
|
||||
}
|
||||
|
||||
except KnowledgeBaseError as e:
|
||||
logger.error(f"Update document error: {e}")
|
||||
return {
|
||||
"success": False,
|
||||
"error": e.message,
|
||||
"code": e.code.value,
|
||||
}
|
||||
except Exception as e:
|
||||
logger.error(f"Unexpected update document error: {e}")
|
||||
return {
|
||||
"success": False,
|
||||
"error": str(e),
|
||||
}
|
||||
|
||||
|
||||
def main() -> None:
|
||||
"""Run the server."""
|
||||
import uvicorn
|
||||
|
||||
settings = get_settings()
|
||||
|
||||
uvicorn.run(
|
||||
"server:app",
|
||||
host=settings.host,
|
||||
port=settings.port,
|
||||
reload=settings.debug,
|
||||
log_level="info",
|
||||
)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
mcp.run()
|
||||
main()
|
||||
|
||||
Reference in New Issue
Block a user