---
title: "A2A Agent Card Validator & Extension Checker"
method: POST
path: "/v1/tools/verify_a2a_agent_card"
tags: ["TODO_TAGS_REVIEW", "TODO_AP2_EXPORT_REVIEW"]
---

# A2A Agent Card Validator & Extension Checker

`POST /v1/tools/verify_a2a_agent_card`

## Request

- Base URL: `https://ainumbers.co`
- URL: `https://ainumbers.co/v1/tools/verify_a2a_agent_card`
- Auth: none declared

Validates an A2A agent-card.json against the v1.0 shape: identity fields, capabilities, extensions (AP2/x402), input/output modes, skills, provider, signed-card JWS block. Branch B, node 1 of the Agentic Rail Chain. Promoted from T283.

**Tool URL:** https://ainumbers.co/chaingraph/art-25-a2a-agent-card-validator.html

## Request body

- object
  - `agent_card` unknown, required

## Response `200`

Successful tool execution result

- object
  - `errors` integer
  - `findings` object[]
    - `level` string
    - `msg` string
  - `has_ap2_extension` boolean
  - `has_signed_card` boolean
  - `passes` integer
  - `score` integer
  - `verdict` string
  - `warnings` integer

---

[API](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite.md) · [All operations](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite/llms.txt) · [OpenAPI document](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite/revisions/b462e4f5bb28?raw)