What is vibe-check-mcp-server AGENTS.md?

Instructions for Vibe Check MCP, a small oversight service for AI agents. It offers questions that challenge an agent's current direction and optional logging of mistakes and successes across requests.

Use it while building or running an agent that needs clarifying questions or review prompts. It supports Gemini, OpenAI, Anthropic, and OpenRouter language models.

It helps reduce tunnel vision by prompting the agent to reconsider its assumptions and approach. Keeping a session identifier can preserve history between requests.

How PV-Bhat/vibe-check-mcp-server configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to PV-Bhat/vibe-check-mcp-server. 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/PV-Bhat/vibe-check-mcp-server/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/PV-Bhat/vibe-check-mcp-server

Made for: Codex, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/pv-bhat/vibe-check-mcp-server/agents-md/github.svg)](https://agentmods.dev/instructions/pv-bhat/vibe-check-mcp-server/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/pv-bhat/vibe-check-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/pv-bhat/vibe-check-mcp-server/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/pv-bhat/vibe-check-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/pv-bhat/vibe-check-mcp-server/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 420 This file is loaded in full into every session.

When invoked 420 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.

Model	Per session	Once invoked
Fable 5.1	$0.00420	$0.00420
Opus 5	$0.00210	$0.00210
Sonnet 5	$0.00084	$0.00084
Haiku 4.5	$0.00042	$0.00042

Measured 9d ago against content hash 87d7b927614c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

vibe-check-mcp-server 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 9d 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:

vibe-check-mcp-server AGENTS.md — 86% identical, 10 lines differ

AGENTS.md · 49 lines

What it actually says

Agent Quickstart

Vibe Check MCP is a lightweight oversight layer for AI agents. It exposes two tools:

vibe_check – prompts you with clarifying questions to prevent tunnel vision.
vibe_learn – optional logging of mistakes and successes for later review.

The server supports Gemini, OpenAI, Anthropic, and OpenRouter LLMs. History is maintained across requests when a sessionId is provided.

Setup

Install dependencies and build:
```
npm install
npm run build
```
Supply the following environment variables as needed:
- GEMINI_API_KEY
- OPENAI_API_KEY
- OPENROUTER_API_KEY
- ANTHROPIC_API_KEY (official Anthropic deployments)
- ANTHROPIC_AUTH_TOKEN (Anthropic-compatible proxies)
- ANTHROPIC_BASE_URL (optional; defaults to https://api.anthropic.com)
- ANTHROPIC_VERSION (optional; defaults to 2023-06-01)
- DEFAULT_LLM_PROVIDER (gemini | openai | openrouter | anthropic)
- DEFAULT_MODEL (e.g., gemini-3.6-flash; leave unset for the provider default)
Start the server:
```
npm start
```

Testing

Run unit tests with npm test. Example request generators are provided:

alt-test-gemini.js
alt-test-openai.js
alt-test.js (OpenRouter)

Each script writes a request.json file that you can pipe to the server:

node build/index.js < request.json

Integration Tips

Call vibe_check regularly with your goal, plan and current progress. Use vibe_learn whenever you want to record a resolved issue. Full API details are in docs/technical-reference.md.

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.

9d ago First seen · 49 lines · 420 tokens per session scan A 87d7b927614c

Subscribe to this mod's changes

vibe-check-mcp-server AGENTS.md is an instructions file published in the GitHub repository PV-Bhat/vibe-check-mcp-server (502 stars, last pushed 6d ago), licensed MIT. It adds 420 tokens to every session, about $0.0021 per session on Opus 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 2026-08-30.

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