Mmcp.market

404.directory MCP server

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by MM-sheng·io.github.MM-sheng/404-directory·v0.10.3·1 stars
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Risk preflight for AI Agent tool actions and Polymarket settlement and execution checks.

B71/100grade B
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Safety scan
B71/100

full report

Adoption
Growing

1 stars41 downloads/wk

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

404.directory tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Public scan report

scanner v0.1.9 · 2026-09-20 · same rubric, same numbers if you re-run it

1 high
  • Code scan2 source files scanned25/25
  • Live reliabilityremote unreachable: HTTP 5000/20
  • –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 15 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Findings (1)

  • highRemote endpoint did not respondreliability.unreachable

    HTTP 500

Overall 71/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Install 404.directory in Claude Code, Cursor or VS Code

claude mcp add --transport http 404-directory https://404.directory/mcp
Add to Cursor

What the publisher says

From the 404.directory repository's README, as published. We do not edit it. Read it on GitHub

404.directory

Risk preflight for AI Agent actions.

404.directory gives AI Agents an evidence-backed allow, review, or block decision before they install or invoke a third-party tool. Discovery, provider verification, live checks, privacy-safe usage evidence, and a curated read-only MCP gateway support that decision.

The first vertical decision workflow evaluates Polymarket settlement wording, timing, public order-book liquidity, caller-observed eligibility, and execution mode before an Agent contemplates a Yes/No action. It never predicts the winner or places an order.

Connect a real Agent in under a minute (Codex, Cursor, Claude Code, or MCP SDK): https://404.directory/connect?source=github

External users can join the first-10 activation pilot and report only the client, task category, and failure stage: https://github.com/MM-sheng/404-directory/issues/1

Agent-readable installation instructions: llms-install.md

Install the Agent Skill in Codex, Claude Code, Cursor, Cline, or another Agent Skills client:

npx skills add MM-sheng/404-directory --skill use-404-directory -g -y

The repository also conforms to Agent Plugins 1.0: compatible clients discover the Agent Skill from skills/ and an identity-preserving bridge to the hosted Streamable HTTP server from the root mcp.json. The bridge creates one random ID in the client-managed PLUGIN_DATA directory. The raw ID stays local; the service stores only an HMAC digest after a successful tool call.

Claude Code and Cowork use the native manifest in .claude-plugin/. It loads the same Skill and identity-preserving bridge with Claude's persistent plugin data directory, so updates keep the installation identity stable.

Install it directly in Claude Code while the official directory submission is under review:

/plugin marketplace add MM-sheng/404-directory
/plugin install 404-directory@404-directory

Product layers

The current product is intentionally narrow: preflight one prediction-market decision or one registered third-party tool action, then capture a bounded outcome. Future identity, reputation, guarantee, and insurance layers remain hypotheses until real external Agent usage validates them.

Current first-party tools

Shortened. The full README is on GitHub.

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

404.directory: common questions

Is 404.directory MCP server safe?
Mostly: it is graded B (71/100). Read the 404.directory safety report
How do I install 404.directory?
It runs remotely at 404.directory. 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 404.directory need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is 404.directory maintained?
The last commit was 22 days ago (2026-09-06). The latest release is v0.10.3.
Is 404.directory up?
0% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of 404.directory?
Servers from other publishers that do the same job: Decionis MCP server, IWE MCP server and Agent-Native Chat MCP server. Compare all 404.directory alternatives.

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