a2a-gateway SKILL.md skillB
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
a2a-gateway from opencrabs/opencrabs is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add opencrabs/opencrabs/a2a-gateway@git:20260503.68c0c2aPins git:20260503.68c0c2a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- opencrabs/opencrabs
- Path
src/docs/reference/templates/skills/a2a-gateway/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260503.68c0c2a, committed May 3, 2026
- Size
- 1,380 bytes
- Repository stars
- 1,000
- License
- MIT
Agent-to-Agent (A2A) protocol gateway reference. JSON-RPC 2.0 peer-to-peer agent communication. (/a2a-gateway, a2a, agent protocol).
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 Gateway Reference OpenCrabs exposes an A2A Protocol HTTP gateway for peer-to-peer agent communication. ## What it does Other A2A-compatible agents send tasks via JSON-RPC 2.0. OpenCrabs processes them using its full tool suite and returns results. ## Endpoints - `GET /.well-known/agent.json` — Agent Card discovery (skills, capabilities) - `POST /a2a/v1` — JSON-RPC 2.0 (`message/send`, `tasks/get`, `tasks/cancel`) - `GET /a2a/health` — Health check ## Setup Enable in `~/.opencrabs/config.toml`: ```toml [a2a] enabled = true bind = "127.0.0.1" port = 18790 ``` ## Bee Colony Debate Multi-agent structured debate with knowledge-enriched context from QMD memory search. Configurable rounds, confidence-weighted consensus based on ReConcile (ACL 2024). ## Tool: a2a_send | Param | Required | What | |-------|----------|------| | `action` | Yes | `discover`, `send`, `get`, `cancel` | | `url` | Yes | Base URL of remote agent (e.g. http://127.0.0.1:18790) | | `message` | For `send` | Text to send | | `task_id` | For `get`/`cancel` | Task ID to check/cancel | | `context_id` | Optional | Continue a conversation | | `api_key` | Optional | Bearer token for authenticated endpoints |
Read the whole file at its exact version.
How to install
mdr add opencrabs/opencrabs/a2a-gateway@sha256:ba5aa84db99f0f68The line at the top of this page pins the label git:20260503.68c0c2a, 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_2ntz2gg54pxgzu4p)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on May 3, 2026.
Audit of the latest version
- fail: No link to a raw IP address (matched: http://127.0.0.1:18790)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (1380 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 script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
opencrabs/opencrabs · 1,000 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_2ntz2gg54pxgzu4p GET https://markdownregistry.com/api/v1/resolve?ref=opencrabs/opencrabs/a2a-gateway GET https://markdownregistry.com/api/v1/blob/ba5aa84db99f0f684322c9c47d41a54b4f395089a5e7762de6912538c884da7d
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.
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