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Cue

by contentmaster669-tech
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Python
Remote

Cue — AI Honesty Guardian

An MCP server that detects sycophancy (an AI agreeing to please) and hallucination (confident falsehoods) in AI responses. When a problem is found it returns a short alert plus one rewritten prompt, in the user's own language. When nothing is wrong it returns nothing at all.

Silence is the product.

Tools

Tool

Cost

Purpose

cue_status

free

Active Indicator. Static string, no API or DB call.

analyze_message

1 check

Audits a draft response. Returns "" unless a problem is found.

check_usage

free

Remaining daily quota and plan.

Related MCP server: openclaw-output-vetter-mcp

Setup

pip install -e ".[dev]"
cp .env.example .env        # then fill in the three values

Run the migrations in supabase/migrations/ against your Supabase project, in order (001, 002, 003) — the SQL editor works fine.

Issue yourself a key:

python scripts/issue_key.py you@example.com

The raw key prints once and is not recoverable. Your connector URL is https://usecue.online/mcp, which is what users paste into their AI header. Both go into your AI app's connector settings.

Development

pytest                       # all tests
pytest tests/test_quota.py   # one file
pytest -k silence            # the tests that matter most
ruff check . && ruff format .
vercel dev                   # local serverless emulation
vercel --prod                # deploy

Environment

Variable

Notes

OPENAI_API_KEY

Detection calls.

SUPABASE_URL

Project URL.

SUPABASE_SERVICE_KEY

Must be the service role key — RLS is deny-by-default, so the anon key reads zero rows. SUPABASE_KEY is accepted as an alias.

Design notes

Two constraints shape everything, and both contradict the obvious assumption:

MCP cannot intercept AI responses. It is a pull protocol — the client decides when to call, and there is no per-message hook. Near-passive operation comes only from analyze_message's tool description persuading the host model to self-audit. Claude complies reliably; other clients less so.

serverInfo is not rendered by Claude's connector UI. The name shown in Settings is whatever the user typed when adding the URL. That is why the Active Indicator is a tool — its presence in the tools panel is the signal.

See CLAUDE.md for the full set of non-obvious constraints.

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivityMaintained
ResponsivenessNo issues

Resources

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