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/authentication-portal-jwks/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/authentication-portal-jwks)<a href="https://agentmods.dev/skills/greenpau/go-authcrunch/authentication-portal-jwks"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/authentication-portal-jwks/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/authentication-portal-jwks"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/authentication-portal-jwks.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 | $0.00062 | $0.02381 |
| Opus 5.5 | $0.00025 | $0.00952 |
| Sonnet 5.5 | $0.00012 | $0.00476 |
| Haiku 4.5 | $0.00006 | $0.00238 |
Grade A, and why
authentication-portal-jwks 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 12d ago.
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 — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Authentication Portal JWKS
Ownership
pkg/authn/serve_http.go routes public discovery to
pkg/authn/handle_http_jwks.go. pkg/kms/jwks.go owns CryptoKeyStore.GetJWKS
and public-key serialization. Keep signing-key selection aligned with
CryptoKeyStore.SignToken(nil, nil, user) in pkg/kms/crypto_keystore.go.
Legacy portal access-token issuance paths use this default selection.
Selected external access signing uses the shared strict boundary and publishes
its captured public profile instead; read the
selected access signing contract
when changing that mode.
pkg/authn/handle_api_private_keys.go owns the explicitly enabled admin export
route. pkg/kms/jwks_private_keys.go owns GetJWKSPrivateKeys. Both public
and private exports use getJWKSSigningKeys for identical selection, ordering,
and deduplication; keep private encoding separate from GetJWKS.
This is portal-issued JWT discovery. Upstream OAuth key consumption belongs to
oauth-identity-provider and
pkg/idp/oauth/jwks.go; its JwksKey model includes shared secrets and must
not be reused as a public export model. JWTs here use signatures, not
asymmetric payload encryption.
HTTP Contract
The public endpoint is <mount>/.well-known/jwks.json. Root, /auth/,
/xauth/, and /tenant/xauth/ mounts expose,
respectively, /.well-known/jwks.json, /auth/.well-known/jwks.json,
/xauth/.well-known/jwks.json, and
/tenant/xauth/.well-known/jwks.json.
Portal.ServeHTTPAt first checks the explicit mount boundary, then recognizes
only the exact discovery endpoint with its canonical escaped spelling. Encoded
mount aliases, outside paths and neighbor prefixes cannot reach discovery. A
JWKS suffix inside an API/provider/resource path stays with that owner. Follow
the shared mount contract
for pure portalpath.Validate rules and feature agreement. The standalone host
uses this entry point.
What ships with it
4 files 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.
- 12d ago Changed · +21 lines e1a97ac93189
- 1mo ago Changed · -250 lines 7e08806eed7d
- 1mo ago Changed · +75 lines · +6 tokens per session 0b41ce9dda76
- 1mo ago First seen · 343 lines · 56 tokens per session scan A a62a87c27640
authentication-portal-jwks is a skill published in the GitHub repository greenpau/go-authcrunch (60 stars, last pushed 10d ago), licensed Apache-2.0. It adds 62 tokens to every session and 2,381 once invoked, about $0.0002 per session on Opus 5.5. 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.
authentication-portal-jwks compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| authentication-portal-jwksgreenpau/go-authcrunch | Skill | 60 | 10d ago | Apache-2.0 | A | 62 | Codex |
| mem0-oss-to-platformmem0ai/mem0 | Skill | 68k | 2d ago | Apache-2.0 | A | 217 | Claude Code, Codex |
| azure-mgmt-botservice-dotnetmicrosoft/skills | Skill | 3.2k | yesterday | MIT | A | 78 | Claude Code |
| fastapi-router-pymicrosoft/skills | Skill | 3.2k | yesterday | MIT | A | 46 | Claude Code |
| dev-runtimelangwatch/langwatch | Skill | 5.0k | yesterday | Apache-2.0 | A | 172 | Claude Code |
| api-designericrisco/rsc-harness | Skill | 503 | 2d ago | MIT | A | 105 | Claude Code, Codex |
| migrate-segw-to-raparc-mcp/arc-1 | Skill | 252 | yesterday | MIT | A | 106 | Claude Code |