a2a-dev-patterns SKILL.md skillA
a2a-dev-patterns from orcaqubits/agentic-commerce-skills-plugins is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add orcaqubits/agentic-commerce-skills-plugins/a2a-dev-patterns@git:20260309.786511cPins git:20260309.786511c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- orcaqubits/agentic-commerce-skills-plugins
- Path
a2a-multi-agent/skills/a2a-dev-patterns/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260309.786511c, committed Mar 9, 2026
- Size
- 5,780 bytes
- Repository stars
- 40
- License
- MIT
Apply A2A cross-cutting development patterns — orchestration topologies, idempotency, observability, agent registries, versioning, and production deployment. Use when architecting multi-agent systems or solving cross-cutting concerns.
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 Development Patterns
## Before writing code
**Fetch live docs**:
1. Fetch `https://a2a-protocol.org/latest/specification/` for the latest protocol details
2. Web-search `a2a protocol best practices multi-agent architecture` for community patterns
3. Web-search `site:github.com a2aproject A2A samples patterns` for reference architectures
4. Web-search `multi-agent system design patterns` for general multi-agent architecture guidance
## Conceptual Architecture
### Orchestration Topologies
#### Hub-and-Spoke (Orchestrator)
A central coordinator agent delegates subtasks to specialist agents:
```
┌→ Research Agent
Coordinator Agent ──┼→ Analysis Agent
└→ Writing Agent
```
- **Pros**: Centralized control, clear task routing, easy to monitor
- **Cons**: Single point of failure, coordinator bottleneck
- **Use when**: Well-defined subtask decomposition, need for aggregation
#### Peer-to-Peer (Mesh)
Agents discover and communicate directly with each other:
```
Agent A ←→ Agent B
↕ ↕
Agent C ←→ Agent D
```
- **Pros**: No single point of failure, flexible
- **Cons**: Complex routing, harder to monitor, potential loops
…Read the whole file at its exact version.
How to install
mdr add orcaqubits/agentic-commerce-skills-plugins/a2a-dev-patterns@sha256:5a9c06a8906156f5The line at the top of this page pins the label git:20260309.786511c, 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_as6ebdgz2t6penfl)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Mar 9, 2026.
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 (5780 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
orcaqubits/agentic-commerce-skills-plugins · 40 stars · license MIT · pushed 2026-09-14 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_as6ebdgz2t6penfl GET https://markdownregistry.com/api/v1/resolve?ref=orcaqubits/agentic-commerce-skills-plugins/a2a-dev-patterns GET https://markdownregistry.com/api/v1/blob/5a9c06a8906156f597a0f47a7723bf3d5454ea1f511bbd98d7671039897bce33
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.