design-a2a-agent-card SKILL.md skillA
design-a2a-agent-card from pjt222/agent-almanac is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add pjt222/agent-almanac/design-a2a-agent-card@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- pjt222/agent-almanac
- Path
i18n/caveman-lite/skills/design-a2a-agent-card/SKILL.md- Versions recorded
- 3
- Latest version
- v1.0, committed Aug 17, 2026
- First version recorded
- Apr 19, 2026
- Size
- 11,008 bytes
- Repository stars
- 43
- License
- MIT
Design an A2A Agent Card (.well-known/agent.json) manifest describing agent capabilities, skills, authentication requirements, and supported content types. Use when building an agent that must be discoverable by other A2A-compliant agents, exposing capabilities for multi-agent orchestration, migrating an existing agent to the A2A protocol, defining the public contract for an agent before implementation, or integrating with agent registries that consume Agent Cards.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Design A2A Agent Card
Create a standards-compliant A2A Agent Card that advertises an agent's identity, skills, authentication requirements, and capabilities for discovery by other agents.
## When to Use
- Building an agent that must be discoverable by other A2A-compliant agents
- Exposing agent capabilities for multi-agent orchestration
- Migrating an existing agent to the A2A (Agent-to-Agent) protocol
- Defining the public contract for an agent before implementation
- Integrating with agent registries or directories that consume Agent Cards
## Inputs
- **Required**: Agent name and description
- **Required**: List of skills the agent can perform (name, description, input/output schemas)
- **Required**: Base URL where the agent will be hosted
- **Optional**: Authentication method (`none`, `oauth2`, `oidc`, `api-key`)
- **Optional**: Supported content types beyond `text/plain` (e.g., `image/png`, `application/json`)
- **Optional**: Capability flags (streaming, push notifications, state transition history)
- **Optional**: Provider organization name and URL
## Procedure
### Step 1: Define Agent Identity and Description
1.1. Choose the agent identity fields:
```json
{
…Read the whole file at its exact version.
How to install
mdr add pjt222/agent-almanac/design-a2a-agent-card@sha256:5627a081eda66b93The line at the top of this page pins the label v1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_22ayfhtcwh6sguxu)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Apr 19, 2026 and Aug 17, 2026, about one every 60 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0 latest | 2026-08-17 | a784899 | 11,008 B | A | view · diff |
| v1.0 | 2026-04-23 | eb36d45 | 10,979 B | A | view · diff |
| v1.0 | 2026-04-19 | e334ebd | 11,026 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11008 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
pjt222/agent-almanac · 43 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_22ayfhtcwh6sguxu GET https://markdownregistry.com/api/v1/resolve?ref=pjt222/agent-almanac/design-a2a-agent-card GET https://markdownregistry.com/api/v1/blob/5627a081eda66b93f7fce6f433d401875c4759ba3fe1a37f1d9dc87a69c99e08
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.