Blackwall

bluetieroperations-create/blackwall-mcp

Before your agent deletes production data or wires $50k, it calls the forecast tool and gets back a risk score, reversibility class, and GO/CAUTION/STOP verdict in under 8 seconds. You wrap SQL statements, payments, file deletes, or emails in a single gate() call; if the verdict is STOP, the action never runs. Works in Claude Desktop, Cursor, Windsurf, or any Node agent via the library. Each forecast includes a cryptographic receipt you can verify offline. Start in observe mode to see what your agents almost did without blocking anything, then flip to enforce when you're ready. Free tier gives you about 100 forecasts per month.

tool: 1
auth: Secret needed
transport: STDIO
env vars: 2
last updated: Aug 25, 2026

View on GitHub

Tools

1 tools

Public tool metadata for what this MCP can expose to an agent.

forecastCall this BEFORE taking ANY irreversible or high-stakes action — sending an email, making a payment, running SQL, deleting files or data, posting public content, or calling an external API that changes state. Returns a risk score (0–100), a recommendation (GO / CAUTION / STOP)...3 params

Call this BEFORE taking ANY irreversible or high-stakes action — sending an email, making a payment, running SQL, deleting files or data, posting public content, or calling an external API that changes state. Returns a risk score (0–100), a recommendation (GO / CAUTION / STOP)...

Parameters* required

actionstring

The action about to be taken, e.g. 'send_email', 'make_payment', 'run_sql', 'delete_file', 'delete_database', 'post_content', 'api_call'.

contextobject

Optional situational context: { agent_role, user_intent, environment }.

inputsobject

The concrete parameters of the action: recipient, amount_usd, SQL statement, file path, message body, URL, etc. Include everything relevant to judging risk.

Configuration

BLACKWALL_API_KEY*secret

Your BLACK_WALL API key (bw_live_…) from https://blackwalltier.com/dashboard/keys

BLACKWALL_MODE

observe (log only, never block) or enforce (default).

Readme

blackwall-mcp

A guardrail for AI agents, as an MCP server. Your agent calls one tool — forecast — before any irreversible action (send email, move money, run SQL, delete data, post content). It gets back a risk score (0–100), a reversibility class, a GO / CAUTION / STOP recommendation, and named red flags in a few seconds (~4-8s).

Works in any MCP host: Claude Desktop, Claude Code, Cursor, Windsurf, and any agent framework with MCP support.

The wall between your agent and disaster. A BLUETIER product.

1. Get an API key

Sign up free at https://blackwalltier.com → Dashboard → API keys → Create key. Free tier: ~100 forecasts/month, no card. Your key looks like bw_live_….

2. Add the server to your MCP host

Claude Desktop

Edit claude_desktop_config.json (Settings → Developer → Edit Config):

View the full README on GitHub

Details

Repository: github.com/bluetieroperations-create/blackwall-mcp
Website: blackwalltier.com
Categories: Databases, AI & LLM Tools, Communication & Messaging
Package: blackwall-mcp
Transport: STDIO
Auth: Required
Registry: MCP registry, active

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