Borrowing it
Nothing to install: this file belongs to greenpau/go-authcrunch. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/greenpau/go-authcrunch/main/.codex/skills/oauth-identity-provider/SKILL.mdgit clone --depth 1 https://github.com/greenpau/go-authcrunchWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/greenpau/go-authcrunch/oauth-identity-provider)<a href="https://agentmods.dev/skills/greenpau/go-authcrunch/oauth-identity-provider"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/oauth-identity-provider/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/greenpau/go-authcrunch/oauth-identity-provider"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/oauth-identity-provider.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00054 | $0.02042 |
| Opus 5 | $0.00027 | $0.01021 |
| Sonnet 5 | $0.00011 | $0.00408 |
| Haiku 4.5 | $0.00005 | $0.00204 |
Grade A, and why
oauth-identity-provider scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OAuth Identity Provider
Ownership and Entry Points
pkg/idp/config.go validates the shared provider parameter allowlist;
pkg/idp/provider.go constructs the concrete provider. OAuth behavior lives
under pkg/idp/oauth. Exercise this dispatcher as well as concrete helpers:
an OAuth Config field is not usable through the shared API until dispatch
accepts it and checks its type.
authenticate.go owns redirects and code exchange; validator.go owns token
roles and trust claims; jwt.go owns signature verification and bounded retry;
jwks.go owns key conversion; jwks_store.go owns remote ingestion, static
pins, candidate selection, and refresh. provider.go owns setup/discovery.
The provider verifies upstream credentials. The portal subsequently signs a separate credential using its existing KMS configuration. Keep upstream keys, algorithms, issuer metadata, and key refresh independent of portal signing selection, token settings, and portal JWKS publication. ES512 is the existing autogeneration fallback, not a mandatory portal signing algorithm.
Ed25519 Verification Contract
internal/jwtutil registers the exact Ed25519 JOSE name and recognizes the
two concrete supported methods. The pinned JWT library provides EdDSA.
Both use pure Ed25519 over the original JWS bytes. Preserve exact method names
and never rewrite a signed header, prehash the message, or duplicate registry
initialization. KMS also consumes this helper.
The key representation follows RFC 8037;
the fully specified JOSE name follows RFC 9864.
New OKP keys require crv: Ed25519 and canonical unpadded base64url x with
exactly 32 bytes. Return a typed ed25519.PublicKey, never an HMAC byte secret.
Reject encryption use, incompatible public parameters, private d, and other
curves. Ed448 and X25519 are unsupported. Unknown unrelated extensions can be
ignored. For key_ops, omission allows verification; an explicit list must
contain verify, may also contain sign, and cannot contain duplicates or
other operations. Empty, null, and malformed lists are rejected for OKP.
Present empty or null alg/use values are invalid in remote OKP entries;
Go struct zero values still represent omitted optional fields.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 171 lines · 54 tokens per session scan A 2be2adef80af
oauth-identity-provider is a skill published in the GitHub repository greenpau/go-authcrunch (59 stars, last pushed yesterday), licensed Apache-2.0. It adds 54 tokens to every session and 2,042 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-13.
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