---
title: "A2A AgentCard projection of the canonical alignment card."
method: GET
path: "/agents/{agent_id}/a2a-agent-card"
tags: ["A2A"]
---

# A2A AgentCard projection of the canonical alignment card.

`GET /agents/{agent_id}/a2a-agent-card`

## Request

- Base URL: `https://api.mnemom.ai/v1`
- URL: `https://api.mnemom.ai/v1/agents/{agent_id}/a2a-agent-card`
- Auth: none required

Public discovery surface. Returns the Mnemom-composed AgentCard in A2A v1.x envelope shape, with AAP alignment + attestation extensions. Gated per-agent by `agents.a2a_export_enabled` (opt-out agents return 404 to avoid enumeration). Unauthenticated; cacheable for 60 seconds; ETag = combined canonical content_hash. cards-as-primitive Phase 5 B2.

## Path parameters

- `agent_id` string, required

## Response `200`

A2A AgentCard.

- object
  - `schemaVersion` '1.0', required
  - `name` string, required
  - `description` string, required
  - `url` string, uri, required
  - `version` string, required
  - `capabilities` object, required
    - `streaming` boolean, required
    - `pushNotifications` boolean, required
  - `skills` object[], required
    - `id` string, required
    - `name` string, required
    - `description` string
    - `tags` string[]
  - `extensions` object[], required
    - `uri` string, uri, required
    - `required` boolean, required
    - `body` object, required
  - `metadata` object, required
    - `content_hash` string
    - `composed_at` string, date-time

## Other responses

- `400`: Bad request
- `404`: Resource not found
- `429`: Rate-limit exceeded. The global per-IP limiter (100 requests/minute, applied to every `/v1/*` route) rejected this request. Back off until the window resets — `Retry-After` carries the cooldown in seconds and `X-RateLimit-Reset` the absolute reset time.
- `500`: Server error — request was well-formed but the server failed to fulfill it. Typically a downstream dependency (DB / RPC / external API) returned an unexpected error.
- `503`: An upstream dependency is currently unavailable. The request was not processed; retry after the cooldown window.

---

[API](https://skmtc.dev/mnemom/apis/mnemom-api.md) · [All operations](https://skmtc.dev/mnemom/apis/mnemom-api/llms.txt) · [OpenAPI document](https://skmtc.dev/mnemom/apis/mnemom-api/revisions/274b7a6ea182?raw)