> ## Documentation Index
> Fetch the complete documentation index at: https://agentheya.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# a2a_card

> The discovery card other agents see when this agent is exposed over the A2A protocol — its description, example prompts, tags, and documentation URL.…

# `a2a_card` — Agent-to-agent card

The discovery card other agents see when this agent is exposed over the A2A protocol — its description, example prompts, tags, and documentation URL. These override the defaults derived from `public_details`.

**Section key** `a2a_card` · **Shape** object · **Tier** Business only (not in the free trial)\
**Edit in the dashboard:** [Details page](/sidebar-menu/details)\
**Related:** [A2A protocol & endpoint](/a2a)

## Fields

| Field               | Required | Type           | Allowed values / constraints | Default | Description                                                                                          |
| ------------------- | -------- | -------------- | ---------------------------- | ------- | ---------------------------------------------------------------------------------------------------- |
| `a2a_description`   | no       | string \| null | —                            | —       | Custom agent description for A2A discovery (max 2000 chars). Null = use public\_details.description. |
| `examples`          | no       | array \| null  | —                            | —       | Example queries other agents can send (max 10, each max 200 chars).                                  |
| `extra_tags`        | no       | array \| null  | —                            | —       | Additional discovery tags (lowercase, alphanumeric + \_ -, max 10).                                  |
| `documentation_url` | no       | string \| null | —                            | —       | URL to the agent's documentation (https\:// required). Null = no docs link.                          |