MCP.Market

Guardrail MCP server

online · 100% uptime
by kadopi·io.github.kadopi/guardrail-mcp·v0.0.1
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Deterministic preflight checks for credentials, fund transfers, writes, and prompt overrides.

B77/100grade B
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Safety scan
B77/100

full report

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If you have run it, two minutes of your experience saves the next person an afternoon.

Guardrail MCP tools (2, 1 write)

write = sends, deletes, buys or posts
  • assess_action_riskwrite actionFree

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

  • get_guardrail_capabilitiesFree

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

Public scan report

scanner v0.1.10 · 2026-10-16 · same rubric, same numbers if you re-run it

1 high
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 236ms20/20
  • Tool poisoning2 tool descriptions checked15/15
  • Auth qualityopen endpoint exposes 1 write-action tools with no auth3/15
  • Maintenancelast push 43 days ago12/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Findings (1)

  • highWrite-action tools reachable without authenticationauth.open-write
Overall 77/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Guardrail MCP compares

Against every graded AI and agents MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
77/100
higher than 50% of 4,460 AI and agents servers
Tools
2
the typical AI and agents server has 6
Tools that change things
50%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote AI and agents server answers 100%
Response time
37 ms
faster than 97% of 2,331 AI and agents servers

What its tools let an agent do: 1 read · 1 change

Install Guardrail MCP in Claude Code, Cursor or VS Code

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

What the publisher says

From the Guardrail MCP repository's README, as published. We do not edit it. Read it on GitHub

Guardrail MCP

Small, free, read-only Remote MCP for deterministic action preflight.

It exposes two tools:

  • getguardrailcapabilities
  • assessactionrisk

The check detects a deliberately small set of high-risk patterns: credential exposure, fund movement, external writes, and instruction overrides. It does not execute an action, persist a request, authenticate a user, charge a payment, call AI, or fetch external URLs.

Local use

npm run check
npm test
npm run dev

Endpoints: GET /, GET /health, and stateless Streamable HTTP POST /mcp.

Boundary

This is an informational deterministic preflight, not a safety guarantee or legal, financial, or security advice. Deployment and any public endpoint require separate approval.

Nothing above is checked by us. What we check is on the safety report.

Guardrail MCP: common questions

Is Guardrail MCP server safe?
Mostly: it is graded B (77/100). Read the Guardrail MCP safety report
How do I install Guardrail MCP?
It runs remotely at guardrail-mcp.kadopi.workers.dev. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Guardrail MCP need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Guardrail MCP maintained?
The last commit was 62 days ago (2026-09-03). The latest release is v0.0.1.
Is Guardrail MCP up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Guardrail MCP?
Servers from other publishers that do the same job: paper-preflight MCP server, Agent-Native Analytics MCP server and Image MCP server.
How does Guardrail MCP compare with other AI and agents MCP servers?
safety score 77/100 (higher than 50% of 4,460 AI and agents servers); tools 2 (the typical AI and agents server has 6); tools that change things 50% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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