mcp-authorization SKILL.md skillA
mcp-authorization from sigistry/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sigistry/marketplace/mcp-authorization@git:20260826.571bc2fPins git:20260826.571bc2f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sigistry/marketplace
- Path
plugins/mcp-server-smith/skills/mcp-authorization/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260826.571bc2f, committed Aug 26, 2026
- First version recorded
- Aug 2, 2026
- Size
- 4,510 bytes
- Repository stars
- 3
- License
- MIT
This skill should be used when the user mentions "MCP auth", "MCP OAuth", "MCP authorization", "OAuth 2.1", "OIDC", "access token validation", "audience", "resource server", "protected resource metadata", "token passthrough", "confused deputy", "Entra", "Okta", or securing a remote MCP server's identity and access. It provides the 2026-07-28 OAuth 2.1 / OIDC model for MCP servers as OAuth resource servers.
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
# MCP Authorization ## Purpose The MCP 2026-07-28 spec aligns authorization with production **OAuth 2.1 and OIDC**, so a remote MCP server plugs into enterprise identity (Microsoft Entra, Okta, Auth0, Keycloak) without custom workarounds. The model is simple to state and easy to get dangerously wrong: the **MCP server is an OAuth 2.1 resource server**. It does not mint tokens and it does not log users in; it **validates** an access token on every request and serves only what that token authorizes. This skill covers correct validation and the two highest-severity anti-patterns, token passthrough and the confused deputy. (stdio/local servers do not use OAuth, skip this for them.) ## The roles | Role | Who | Responsibility | |---|---|---| | Authorization server (AS) | Entra / Okta / Auth0 / your IdP | authenticates the user, issues access tokens | | Resource server (RS) | **your MCP server** | validates the token, enforces scope, serves tools | | Client | Claude Code / the host app | obtains a token from the AS, sends it to the RS | Your job is the RS. You never see the user's password; you receive a bearer access token and must prove it is valid **and minted for you**. …
Read the whole file at its exact version.
How to install
mdr add sigistry/marketplace/mcp-authorization@sha256:52c1a1738420117eThe line at the top of this page pins the label git:20260826.571bc2f, 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_fmhyiemaib2znygm)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Aug 2, 2026 and Aug 26, 2026, about one every 23 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.571bc2f latest | 2026-08-26 | 571bc2f | 4,510 B | A | view · diff |
| git:20260802.9f9bd44 | 2026-08-02 | 9f9bd44 | 4,510 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 (4510 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
sigistry/marketplace · 3 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_fmhyiemaib2znygm GET https://markdownregistry.com/api/v1/resolve?ref=sigistry/marketplace/mcp-authorization GET https://markdownregistry.com/api/v1/blob/52c1a1738420117ee5fac16c0448d354e8ec7394bba68185f0e75c6c677a3004
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.