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Semantic Search MCP

by bborbe

Semantische Suche

Semantische Suche über Markdown-Dateien. Finden Sie verwandte Notizen nach Bedeutung, nicht nur nach Schlüsselwörtern. Erkennen Sie Duplikate, bevor Sie neue Notizen erstellen.

Unterstützt zwei Server-Transportwege:

  • stdio MCP — Für die Claude Code-Integration (ein Prozess pro Sitzung)

  • HTTP — Kombiniertes MCP-über-HTTP + REST auf einem Port; ein warmer Prozess, der von allen Clients geteilt wird

Funktionen

  • Semantische Suche mittels sentence-transformers

  • Erkennung von doppelten/ähnlichen Notizen

  • Automatische Index-Aktualisierung mit Datei-Überwachung

  • Unterstützung für mehrere Verzeichnisse

  • Inline-Tag-Extraktion (#tag-name)

Related MCP server: mcp-recall-md

Installation

CPU-only Installation — empfohlen für macOS (jeder Mac, Apple Silicon oder Intel) und Linux/Windows ohne NVIDIA GPU. Spart ca. 5 GB an CUDA-Binärdateien. Unter macOS wird die Apple GPU (MPS) weiterhin automatisch erkannt und über das in PyTorch integrierte MPS-Backend genutzt — das Label "CPU" bezieht sich nur auf das Fehlen von CUDA, nicht auf das Rechengerät zur Laufzeit.

uv tool install --index https://download.pytorch.org/whl/cpu \
  git+https://github.com/bborbe/semantic-search

CUDA-Installation — nur für Linux/Windows mit einer dedizierten NVIDIA GPU. Nicht anwendbar auf macOS (NVIDIA CUDA wird auf dem Mac nicht unterstützt).

uv tool install git+https://github.com/bborbe/semantic-search

Upgrade

uv tool upgrade semantic-search

Server-Modi

stdio MCP (pro Sitzung Claude Code)

Startet einen Prozess pro Claude Code-Sitzung. Einfach, aber jede Sitzung lädt ihre eigene ~400 MB–1 GB Modellkopie.

claude mcp add -s project semantic-search \
  --env CONTENT_PATH=/path/to/vault \
  -- \
  uvx --from git+https://github.com/bborbe/semantic-search semantic-search-mcp

Verfügbare Tools:

  • search_related(query, top_k=5) — Findet semantisch verwandte Notizen

  • check_duplicates(file_path) — Erkennt doppelte/ähnliche Notizen

HTTP (geteilt über alle Clients)

Ein einzelner, lang laufender Prozess stellt MCP-über-HTTP unter /mcp sowie REST unter /search, /duplicates, /health, /reindex bereit. Alle Claude Code-Sitzungen und REST-Clients teilen sich einen warmen Indexer.

CONTENT_PATH=/path/to/vault semantic-search-http --host 127.0.0.1 --port 8321

Verweisen Sie Claude Code über die MCP-Konfiguration darauf:

{
  "mcpServers": {
    "semantic-search": {
      "type": "http",
      "url": "http://127.0.0.1:8321/mcp"
    }
  }
}

REST-Endpunkte:

Endpunkt

Methode

Beschreibung

/mcp

POST

MCP-über-HTTP (Claude Code)

/search?q=...&top_k=5

GET

Semantische Suche

/duplicates?file=...&threshold=0.85

GET

Findet doppelte Notizen

/health

GET

Gesundheitsprüfung mit Index-Statistiken

/reindex

GET/POST

Erzwingt den Neuaufbau des Index

Beispielabfragen:

# Search
curl 'http://127.0.0.1:8321/search?q=kubernetes+deployment'

# Find duplicates
curl 'http://127.0.0.1:8321/duplicates?file=notes/my-note.md'

# Health check
curl 'http://127.0.0.1:8321/health'

Claude Code Plugin

Dieses Repo wird auch als Claude Code Marketplace-Plugin mit Befehlen für Einrichtung, Suche und Recherche ausgeliefert.

Installation

claude plugin marketplace add bborbe/semantic-search
claude plugin install semantic-search

Update

claude plugin marketplace update semantic-search
claude plugin update semantic-search@semantic-search

Schnellstart

# One-shot interactive setup: installs the binary, writes the launchd/systemd
# unit, registers the MCP server in your Claude config.
/semantic-search:configure

# Search indexed markdown
/semantic-search:search kubernetes deployment

# Multi-step research across results
/semantic-search:research kafka backup strategy

Befehle

Befehl

Beschreibung

/semantic-search:configure

Installiert semantic-search-http als launchd (macOS) oder systemd-user (Linux) Dienst und registriert den MCP-Server in Claude Code

/semantic-search:search <query> [top_k]

Semantische Suche über den laufenden MCP-Server

/semantic-search:research <topic>

Mehrstufige Recherche — suchen, kategorisieren, Top-Quellen lesen, synthetisieren

Im Hintergrund ausführen

Für den produktiven Einsatz führen Sie semantic-search-http als Hintergrunddienst aus, damit jede Claude Code-Sitzung (und jeder REST-Client) einen warmen Prozess teilt.

Plattform

Anleitung

macOS (launchd)

docs/launchd-service.md

Linux (systemd)

docs/systemd-user-service.md

Kurzes Beispiel (macOS):

launchctl load ~/Library/LaunchAgents/com.github.bborbe.semantic-search-http.plist

Kurzes Beispiel (Linux):

systemctl --user enable --now semantic-search-http.service

CLI-Befehle

Einmalige Befehle ohne laufenden Server:

# Search
CONTENT_PATH=/path/to/vault semantic-search search "kubernetes deployment"

# Find duplicates
CONTENT_PATH=/path/to/vault semantic-search duplicates path/to/note.md

Binärdateien

Binärdatei

Zweck

semantic-search-http

Kombinierter HTTP-Server — MCP unter /mcp + REST-Endpunkte. Einmal ausführen, über Clients teilen.

semantic-search-mcp

stdio MCP-Server — einer pro Claude Code-Sitzung. Verwenden, wenn kein HTTP-Dienst eingerichtet ist.

semantic-search

Nur CLI — search und duplicates Einmalbefehle.

Konfiguration

Umgebungsvariablen

Variable

Beschreibung

Standard

CONTENT_PATH

Zu indexierendes Verzeichnis (durch Kommas getrennt für mehrere)

./content

LOG_LEVEL

Logging-Level (DEBUG, INFO, WARNING, ERROR)

INFO

Mehrere Verzeichnisse

Indexieren Sie mehrere Verzeichnisse, indem Sie die Pfade mit Kommas trennen:

CONTENT_PATH=/path/to/vault1,/path/to/vault2,/path/to/docs

Alle Verzeichnisse werden zusammen indexiert und als ein einheitlicher Index durchsucht.

Funktionsweise

Der erste Durchlauf lädt ein kleines Embedding-Modell (~90 MB) herunter und indexiert Ihre Markdown-Dateien (<1s für typische Vaults). Der Index aktualisiert sich automatisch, wenn Dateien über den Dateisystem-Watcher geändert werden.

Indexierte Inhalte

Jede Markdown-Datei wird mit gewichteten Komponenten indexiert:

Komponente

Gewichtung

Notizen

Dateiname

3x

Frontmatter title

3x

Frontmatter tags

2x

Zusammengeführt mit Inline-Tags

Frontmatter aliases

2x

Inline-Tags (#tag)

2x

Aus dem Text extrahiert

Erste H1-Überschrift

2x

Textinhalt

1x

Erste 500 Wörter

Entwicklung

# Clone
git clone https://github.com/bborbe/semantic-search
cd semantic-search

# Install dev dependencies
make install

# Run checks
make check

# Run tests
make test

Lizenz

BSD 2-Clause License — siehe LICENSE.

Available Tools

3 tools
check_duplicatesA

Find notes that are potential duplicates of the given file.

ParametersJSON Schema
NameRequiredDescriptionDefault
file_pathYesPath to the file (absolute or relative to content directory)

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A3.6/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, and the description does not disclose behavioral details beyond the basic 'Find' action—such as how duplicates are determined, whether the operation is read-only, or any side effects. The burden falls on the description, which is minimal.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, front-loaded sentence with no wasted words, making it highly concise and easy to parse.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (one parameter, output schema present), the description conveys the main purpose adequately. However, it lacks guidance on when to use vs alternatives, which is somewhat a gap but not critical for such a straightforward tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% for the single parameter, so the schema fully describes file_path. The description adds no extra semantic meaning beyond what the schema already states.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('Find') and resource ('notes that are potential duplicates of the given file'), clearly distinguishing it from sibling tools like search_related and get_content.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for checking duplicates but does not explicitly state when to use this tool versus alternatives, nor any exclusions or prerequisites.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_contentB

Fetch the content of a file from the indexed vault.

ParametersJSON Schema
NameRequiredDescriptionDefault
pathYesFile path (absolute or relative to an indexed root)
queryNoSearch string to find the best-matching line (only used when snippet=True)
snippetNoIf True, return a snippet around the best-matching line instead of the full file
context_linesNoNumber of lines before and after the match to include (default 20)

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

TDQS

B3.3/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states the primary action but does not disclose edge cases (e.g., file not found, path resolution), or behavior around optional parameters like snippet and query despite their existence in the schema. This leaves significant behavioral aspects undisclosed.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, tightly worded sentence that immediately conveys the core purpose. There is no fluff or redundancy, and the information is front-loaded. For the tool's purpose, this length is appropriately concise.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has moderate complexity with optional snippet/query parameters and an output schema, and the schema covers parameter semantics. However, the description is thin on operational context, such as how path resolution works or when to use snippet mode. While not incomplete for basic selection, the description itself needed to provide more contextual glue; the schema partially compensates, but gaps remain.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so a baseline of 3 is appropriate. The description itself does not add any parameter semantics beyond the schema, but the schema already documents each parameter (path, query, snippet, context_lines) clearly. The description neither enhances nor detracts from what the schema provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's action ('Fetch the content of a file') and the resource ('indexed vault'), using a specific verb and resource. It distinguishes itself from sibling tools 'search_related' and 'check_duplicates' by focusing on direct content retrieval rather than search or duplication checks.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It does not mention related tools or any exclusionary conditions (e.g., 'use search_related instead when looking for related content'). The intended usage is only implicitly derived from the tool's name and action.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 3 tool updatesv0.1.0
    • First observedcheck_duplicates
    • First observedget_content
    • First observedsearch_related

TDQS

A4/5.0

Scored across 3 tools

Disambiguation5/5

Each tool serves a distinct purpose: semantic search, duplicate detection, and content retrieval. There is no overlap or ambiguity between them.

Naming Consistency5/5

All tool names follow a consistent verb_noun pattern (search_related, check_duplicates, get_content) using snake_case. The naming is predictable and readable.

Tool Count5/5

Three tools is an appropriate, focused set for a semantic search server. Each tool earns its place and the scope is well-defined.

Completeness5/5

The server covers the core needs of semantic search: finding related notes, detecting duplicates, and retrieving content. There are no missing operations that would hinder its stated purpose.

Maintenance

ActivityActive
ResponsivenessNo issues

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