Guardrail MCP

A deterministic preflight check service for credentials, fund transfers, writes, and prompt overrides. It operates as a read-only, stateless endpoint with no external effects, ensuring safety during agent operations.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Community listingStreamable HTTPNo sign-inEndpoint checked 2026-11-06Published by kadopi

MCP endpoint (Streamable HTTP)

https://guardrail-mcp.kadopi.workers.dev/mcp

Vendor documentation

What its tools do

2 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

2 of 2 have a description · 2 of 2 declare behavior hints · 0 of 1 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

Passed Endpoint answered the live check · Nov 6, 2026, 4:07 PM UTC
Availability 1 of 1 checks passed in 30 days

What you can do with it

Perform deterministic preflight checks for credentials
Validate fund transfers before execution
Check write operations for safety
Monitor prompt overrides

Source and maintenance

Community listingRegistry 0.0.1

mcp-registry: io.github.kadopi/guardrail-mcp@0.0.1 Source repository

Maintenance checked: Nov 6, 2026, 3:51 PM UTC

Protocol and capabilities

Server: Guardrail MCP 0.0.1
MCP protocol negotiated in check: 2025-06-18
Tools: 2 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": false
  }
}

Tools

2 advertised

get_guardrail_capabilities — Get Guardrail MCP capabilities

Advertised by the server during the last successful anonymous check.

Advertised read-only

Returns the scope and safety boundary of this free, deterministic preflight checker.

get_guardrail_capabilities input schema

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

get_guardrail_capabilities annotations

{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

assess_action_risk — Assess action risk

Advertised by the server during the last successful anonymous check.

Advertised read-only

Runs a deterministic, read-only preflight check. It never executes the proposed action.

assess_action_risk input schema

{
  "type": "object",
  "required": [
    "action"
  ],
  "properties": {
    "action": {
      "type": "string",
      "maxLength": 4000,
      "minLength": 1
    },
    "content": {
      "type": "string",
      "maxLength": 12000
    }
  },
  "additionalProperties": false
}

assess_action_risk annotations

{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (2 of 2 answered).

2026-11-06: 1 of 1 checks answered
2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 295 ms
95th percentile latency: 295 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 6, 2026, 4:07 PM UTC · probe · passed · 295 ms · metadata changed · 2 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http guardrail-mcp https://guardrail-mcp.kadopi.workers.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add guardrail-mcp --url https://guardrail-mcp.kadopi.workers.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable guardrail-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "guardrail-mcp": {
      "url": "https://guardrail-mcp.kadopi.workers.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "guardrail-mcp": {
      "type": "streamableHttp",
      "url": "https://guardrail-mcp.kadopi.workers.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start guardrail-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "guardrail-mcp": {
      "type": "http",
      "url": "https://guardrail-mcp.kadopi.workers.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http guardrail-mcp https://guardrail-mcp.kadopi.workers.dev/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.

Claude Desktop configuration

https://guardrail-mcp.kadopi.workers.dev/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "guardrail-mcp": {
      "serverUrl": "https://guardrail-mcp.kadopi.workers.dev/mcp"
    }
  }
}

Let your agent find its tools

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