a2a SKILL.md skillA
a2a from razzant/ouroboroshub is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add razzant/ouroboroshub/a2a@v1.5.0Pins v1.5.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- razzant/ouroboroshub
- Path
skills/a2a/SKILL.md- Versions recorded
- 5
- Latest version
- v1.5.0, committed Oct 21, 2026
- First version recorded
- Sep 1, 2026
- Size
- 5,826 bytes
- Repository stars
- 10
- License
- none declared
Agent-to-Agent protocol bridge for Ouroboros. Provides a local A2A-compatible server plus client tools for discovering and messaging other A2A 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
# A2A skill
Note for reviewers: the companion daemon is declared in this manifest's
frontmatter under `companion_processes` (name `a2a_server`, argv
`[python3, scripts/a2a_daemon.py]`, runtime `python3`, restart policy
`on_failure`) and is registered at load via
`api.register_companion_process("a2a_server")`. The host's extension
loader resolves the descriptor from the frontmatter; review-prompt
manifest summaries may omit the `companion_processes` field, so consult
the frontmatter above for the authoritative declaration.
This skill moves Ouroboros's Agent-to-Agent protocol support out of the
core runtime. It exposes a small local A2A-compatible JSON-RPC server and
registers three client tools:
- `discover` — fetch another agent's Agent Card.
- `send` — send a message to another A2A agent.
- `status` — check a remote task status.
The companion process talks back to the host through the loopback Host
Service API using the reviewed `SkillToken` grant. It does not patch the
core runtime and stores task state under the skill state directory.
## Outbound peer credentials
The client tools (`discover`, `send`, `status`) send HTTP Basic credentials only
…Read the whole file at its exact version.
How to install
mdr add razzant/ouroboroshub/a2a@sha256:fa0940646cddbc63The line at the top of this page pins the label v1.5.0, 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_6idci6msapn2keox)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Sep 1, 2026 and Oct 21, 2026, about one every 12 days. Its first recorded version is graded B and its latest A.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.5.0 latest | 2026-10-21 | a3e22a5 | 5,826 B | A | view · diff |
| v1.4.0 | 2026-09-07 | a721551 | 8,152 B | B | view · diff |
| v1.4.0 | 2026-09-07 | e01b81c | 8,016 B | B | view · diff |
| v1.4.0 | 2026-09-07 | fe932f5 | 7,496 B | B | view · diff |
| v1.3.0 | 2026-09-01 | 5da2dae | 5,078 B | B | 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 (5826 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
razzant/ouroboroshub · 10 stars · license none declared · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_6idci6msapn2keox GET https://markdownregistry.com/api/v1/resolve?ref=razzant/ouroboroshub/a2a GET https://markdownregistry.com/api/v1/blob/fa0940646cddbc63005c5ce59f4fc68c1a418c1d22b8da30d57fac71a494166e
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.