A2A Agent Card · liars.town

AgentSearch

Find AI agents and MCP servers by natural-language query. AgentSearch indexes ~3,700 hosted agents daily, probes each for reachability, scores them on reputation + usability + functionality, and returns the best matches for your task with per-agent reasoning. Use it to answer 'is there an agent that does X?' or 'is this specific agent any good?'. Read-only, free, no auth.

Open the live agent card → Agent endpoint liars.town provider profile
Near-conformant. Correctly shaped against the A2A 1.0.0 AgentCard object, but omits optional fields an agent may expect.
Provider: liars.town Conformance: Near-Conformant Protocol: 0.3.0 Transport: JSONRPC Version: 0.1.0 Host: liars.town Skills: 5
Discovery

An A2A client finds this agent by fetching the well-known path on the provider's own host. That is what makes an agent card different from every other agent artifact in this catalog: it is provider-published by construction — it cannot be derived, generated, or reconstructed on a provider's behalf.

https://liars.town/.well-known/agent-card.json
Interfaces
https://agentsearch.luthersystems.com/api/a2a · transport jsonrpc · protocol
https://agentsearch.luthersystems.com/api/mcp · transport mcp-streamable-http · protocol
npx://-y/@luthersystems/agentsearch · transport mcp-stdio · protocol
Skills (5)

Search the agent index search

Take a natural-language query and return the top ranked agents/MCP servers from the index, with per-agent reasoning. Ranked by final_score = query_fit × agent_quality.

searchdiscoveryrankingagent-discoverymcp-discovery

Get a scored agent profile agent_details

Return the full scored profile for one named indexed agent: inventory data, layer-by-layer scores (Fame / Usability / Functionality / Call Graph), reasoning, and live blocker status.

detailsprofilescoring

Live-score an arbitrary agent URL found_agent

Crawl + probe + LLM-score an arbitrary agent URL using the same rubric the batch pipeline uses. Works for agents not (yet) in the index.

scoringliveprobeagent-evaluation

Browse the full index browse

Paginated list of every indexed agent, ranked by overall quality.

browselistrank

Index summary stats stats

Distributions, top categories, and the agent-to-agent call graph for the whole index.

statsrollupsgraph
Documentation
https://github.com/luthersystems/agentsearch
Evidence. Fetched 2026-09-19 from https://liars.town/.well-known/agent-card.json, HTTP 200. The body was saved verbatim and is the sole source for everything on this page — no field is inferred. View the captured card. Providers change what they serve; if this card has moved or changed shape, the provider profile carries the current state as of the last build.

Work with this as data

Every agent card here is available over the APIs.io API and to AI agents over MCP. A2A Agent Cards is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for a2a agent cards

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
Search the catalog 
curl "https://apis.io/api/v1/search?q=liars-town&limit=10"
Everything under a tag 
curl "https://apis.io/api/v1/tags/liars-town"

Discovery needs no key. Ratings and market analysis are Pro.

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