a2a-authentication SKILL.md skillA
a2a-authentication 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-authentication@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-authentication/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260309.786511c, committed Mar 9, 2026
- Size
- 4,511 bytes
- Repository stars
- 40
- License
- MIT
Implement A2A authentication — API keys, Bearer tokens, OAuth 2.0, OpenID Connect, and mutual TLS. Use when securing agent-to-agent communication and configuring Agent Card security schemes.
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 Authentication ## Before writing code **Fetch live docs**: 1. Fetch `https://a2a-protocol.org/latest/specification/` for the authentication and security section 2. Web-search `site:github.com a2aproject A2A authentication security schemes` for auth scheme details 3. Web-search `site:github.com a2aproject a2a-samples authentication` for auth implementation examples 4. Fetch SDK docs for authentication middleware and client credential handling ## Conceptual Architecture ### Why Authentication Matters In multi-agent systems, agents must verify each other's identity and authorize access: - **Server agents** need to know who's calling them and whether they're authorized - **Client agents** need to present valid credentials to access server agents - **Agent Cards** declare what authentication is required upfront ### Five Security Schemes A2A supports the same security scheme types as OpenAPI 3.0: #### 1. API Key (`apiKey`) A static key sent in a header or query parameter. - **Best for**: Internal agents, simple integrations, development - **Agent Card declares**: Header name and location - **Client provides**: The key value in the specified header …
Read the whole file at its exact version.
How to install
mdr add orcaqubits/agentic-commerce-skills-plugins/a2a-authentication@sha256:2411bf030d7cf827The 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_br5ghw6nll675xyl)
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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 (4511 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_br5ghw6nll675xyl GET https://markdownregistry.com/api/v1/resolve?ref=orcaqubits/agentic-commerce-skills-plugins/a2a-authentication GET https://markdownregistry.com/api/v1/blob/2411bf030d7cf8270e99d1104cada8f5b0b662d70a4bc74d92efa935b5e556b5
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.