unboundcompute/security-agent-skills · skills/auditing-device-code-and-pkce-flows/SKILL.md

auditing-device-code-and-pkce-flows skillA

auditing-device-code-and-pkce-flows is agent-read markdown (skill) from unboundcompute/security-agent-skills: Audit the server side of the authorization-code-with-proof-key and device-authorization grants for bugs that let a stolen or guessed code become a token. Covers a token endpoint that issues without checking the proof-key verifier at all, that accepts the plain challenge method or a challenge-absent downgrade, or that binds the verifier to the client rather than to the specific code; and a device grant whose short user code is brute-forceable because polling is unthrottled, whose device code is n.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add unboundcompute/security-agent-skills/auditing-device-code-and-pkce-flows@git:20260821.57dfaf1
Exact content
mdr add unboundcompute/security-agent-skills/auditing-device-code-and-pkce-flows@sha256:9d259c45f1194c7a

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_jrgbp252weslvedz.svg)](https://markdownregistry.com/a/art_jrgbp252weslvedz)

0 badge views in 30 days

Versions

versioncommittedcommitsizeaudit
git:20260821.57dfaf1 latest2026-08-21 57dfaf1 9,855 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (9855 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

GitHub

unboundcompute/security-agent-skills · 5 stars · license MIT · pushed 2026-09-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_jrgbp252weslvedz
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/auditing-device-code-and-pkce-flows
GET https://markdownregistry.com/api/v1/blob/9d259c45f1194c7ae16b812154e2f12966e492dff2fae4d554d43ef67a47f02d

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.