implement-a2a-server SKILL.md skillA
implement-a2a-server 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/implement-a2a-server@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/implement-a2a-server/SKILL.md- Versions recorded
- 4
- Latest version
- v1.0, committed Aug 17, 2026
- First version recorded
- Apr 19, 2026
- Size
- 16,209 bytes
- Repository stars
- 43
- License
- MIT
Implement a JSON-RPC 2.0 A2A server with full task lifecycle management (submitted/working/completed/failed/canceled/input-required), SSE streaming, and push notifications. Use when implementing an agent that participates in multi-agent A2A workflows, building a backend for an Agent Card, adding A2A protocol support to an existing agent or service, or deploying an agent that must interoperate with other A2A-compliant agents.
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
# Implement A2A Server Build a fully compliant A2A server that handles JSON-RPC 2.0 requests, manages task lifecycle states, supports SSE streaming for real-time updates, and serves an Agent Card for discovery. ## When to Use - Implementing an agent that participates in multi-agent A2A workflows - Building a backend for an Agent Card designed with `design-a2a-agent-card` - Adding A2A protocol support to an existing agent or service - Creating a reference A2A server implementation for testing - Deploying an agent that must interoperate with other A2A-compliant agents ## Inputs - **Required**: Agent Card (JSON) defining the agent's skills and capabilities - **Required**: Implementation language (TypeScript/Node.js or Python) - **Required**: Task execution logic for each skill defined in the Agent Card - **Optional**: Push notification webhook support (`true` or `false`) - **Optional**: Persistent task store (in-memory, Redis, PostgreSQL) - **Optional**: Authentication middleware matching the Agent Card's auth scheme - **Optional**: Maximum concurrent tasks limit ## Procedure ### Step 1: Set Up Project with JSON-RPC 2.0 Handler …
Read the whole file at its exact version.
How to install
mdr add pjt222/agent-almanac/implement-a2a-server@sha256:0a557fb0e05a28dfThe 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_tlyt4fw7l4l5vuyi)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Apr 19, 2026 and Aug 17, 2026, about one every 40 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0 latest | 2026-08-17 | a784899 | 16,209 B | A | view · diff |
| v1.0 | 2026-06-05 | 33b561c | 16,180 B | A | view · diff |
| v1.0 | 2026-04-24 | b4968e1 | 16,176 B | A | view · diff |
| v1.0 | 2026-04-19 | e334ebd | 16,238 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 (16209 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_tlyt4fw7l4l5vuyi GET https://markdownregistry.com/api/v1/resolve?ref=pjt222/agent-almanac/implement-a2a-server GET https://markdownregistry.com/api/v1/blob/0a557fb0e05a28df8a3bbfbd6eadb37d3dd3cefed567ce9307b1c65a7d1a7f4b
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.