vector-mcp: Instructions file for Codex

AGENTS.md

vector-mcp AGENTS.md is an instructions file for Codex, OpenCode from markdevshop/vector-mcp. It costs 2,938 tokens per session, scanned A, original, MIT.

Project instructions for a Python Model Context Protocol (MCP) server that connects an agent to vector databases. A vector database stores searchable numerical representations of text or other data.

In plain words
What is it for?
Use them when working on the server, agent, modular skills, vector-database backends, retrievers, migrations, or tests.
Why use it?
They explain the server's components, supported architecture, coding conventions, and exact commands for running and testing it.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions CLAUDE.md; mentions Claude Code; mentions AGENTS.md.

This is markdevshop/vector-mcp's own configuration. It tells Codex and OpenCode how to work on vector-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything vector-mcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to markdevshop/vector-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/markdevshop/vector-mcp/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/markdevshop/vector-mcp

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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Per session 2,938 This file is loaded in full into every session.
When invoked 2,938 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.02938 $0.02938
Opus 5.5 $0.01175 $0.01175
Sonnet 5.5 $0.00588 $0.00588
Haiku 4.5 $0.00294 $0.00294

Measured 1mo ago against content hash 57a5c22ed14c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

vector-mcp AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

AGENTS.md · 308 lines

How it starts

The opening of the file, as written. The whole thing — 308 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Claude Code loads this file via CLAUDE.md (@AGENTS.md import) — the two stay in sync. Edit this file, not CLAUDE.md.

Tech Stack & Architecture

  • Language/Version: Python 3.10+
  • Core Libraries: agent-utilities, fastmcp, pydantic-ai
  • Key principles: Functional patterns, Pydantic for data validation, asynchronous tool execution.
  • Architecture:
    • mcp_server.py: Main MCP server entry point and tool registration.
    • agent.py: Pydantic AI agent definition and logic.
    • skills/: Directory containing modular agent skills (if applicable).
    • vectordb/: Vector database implementations for multiple backends.
    • retriever/: Retriever implementations for each backend.

Architecture Diagram

graph TD
    User([User/A2A]) --> Server[A2A Server / FastAPI]
    Server --> Agent[Pydantic AI Agent]
    Agent --> Skills[Modular Skills]
    Agent --> MCP[MCP Server / FastMCP]
    MCP --> VectorDB[Vector Database Layer]
    VectorDB --> Backend[Backend Implementation]
    Backend --> Storage[(Vector Storage)]

Workflow Diagram

sequenceDiagram
    participant U as User
    participant S as Server
    participant A as Agent
    participant T as MCP Tool
    participant V as VectorDB
    participant B as Backend

    U->>S: Request
    S->>A: Process Query
    A->>T: Invoke Tool
    T->>V: VectorDB Operation
    V->>B: Backend Call
    B-->>V: Backend Response
    V-->>T: VectorDB Result
    T-->>A: Tool Result
    A-->>S: Final Response
    S-->>U: Output

Commands (run these exactly)

Installation

pip install .[all]

Quality & Linting (run from project root)

pre-commit run --all-files

Execution Commands

vector-mcp\nvector_mcp.mcp:mcp_server\n# vector-agent\nvector_mcp.agent:agent_server

Testing

Start test databases

podman-compose -f docker-compose.test.yml up -d

Run all tests

python -m pytest tests/test_all_backends.py -v

Run specific backend tests

python -m pytest tests/test_all_backends.py -k chromadb -v python -m pytest tests/test_all_backends.py -k postgres -v python -m pytest tests/test_all_backends.py -k mongodb -v python -m pytest tests/test_all_backends.py -k qdrant -v python -m pytest tests/test_all_backends.py -k couchbase -v

Read the full file on GitHub · 308 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 308 lines · 2,938 tokens per session scan A 57a5c22ed14c

Subscribe to this mod's changes

vector-mcp AGENTS.md is an instructions file published in the GitHub repository markdevshop/vector-mcp (11 stars, last pushed 3mo ago), licensed MIT. It adds 2,938 tokens to every session, about $0.0118 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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