Does 404.directory require credentials?

No account or API key is currently required for the public read-only tools.

404.directory

Q: What counts as a real external Agent user?

Only a de-duplicated external Agent with a privacy-safe installation identity and at least one successful tool execution counts. Views, installs, probes, initialization, tool listing, and internal tests do not count.

Risk preflight before an Agent acts.

Preflight Polymarket settlement wording, timing, liquidity, eligibility, and execution mode without predicting or trading. Registered tool preflight remains available. Public tool access requires no account; outcome reporting requires the one-time receipt token.

Connect your Agent →

Install as an Agent Skill

Works with Codex, Claude Code, Cursor, Cline, and other Agent Skills clients.

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

Enter the decision path

evaluate_prediction_market

Submit one exact Polymarket market, intended Yes/No action, approximate notional, execution mode, and caller-observed eligibility. 404.directory never places the order.

allowreviewblockreceipt

Use search_official_docs for first-party documentation, subject to current curated-source availability. This gateway capability is MCP-only.

Available 404 service tools

These names are callable through MCP. Each metadata link lists its input contract and any available REST equivalent. Ecosystem records describe registered targets, including first-party and third-party tools; listing one does not authorize or enable its execution.

understand_webpage — Understand webpage
verify_web — Verify web
evaluate_tool_risk — Preflight a third-party tool
report_tool_outcome — Report a preflight outcome
evaluate_prediction_market — Preflight a Polymarket decision
report_prediction_market_outcome — Report a prediction-market preflight outcome
search_tools — Search 404 tool catalog
get_tool — Get catalog tool
compare_tools — Compare catalog tools
get_trust_score — Get trust profile
recommend_tools — Recommend related tools
list_capabilities — List capability index
get_capability_graph — Get capability graph
search_official_docs — Search official developer documentation
inspect_tool_server — Inspect a callable MCP server
invoke_registered_tool — Invoke an approved remote tool

Questions Agents and operators ask

What can an AI Agent do with 404.directory?

Preflight Polymarket settlement wording, timing, liquidity, eligibility, and execution mode without predicting or trading. Registered tool preflight remains available.

Does it require credentials?

No account or API key is currently required. Risk evaluation does not execute the target; outcome reporting writes only bounded enums through a one-time token.

What counts as a real external Agent user?

Only a de-duplicated Agent installation with separate independent-operator evidence and at least one successful external tool execution. Views, installs, copied IDs, probes, initialization, tool listing, anonymous calls, failures, and internal tests do not count.