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-oidc/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-oidc)<a href="https://agentmods.dev/skills/greenpau/go-authcrunch/authentication-portal-oidc"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/authentication-portal-oidc/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-oidc"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/authentication-portal-oidc.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 | $0.00072 | $0.02470 |
| Opus 5 | $0.00036 | $0.01235 |
| Sonnet 5 | $0.00014 | $0.00494 |
| Haiku 4.5 | $0.00007 | $0.00247 |
Grade A, and why
authentication-portal-oidc 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 — 185 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Authentication Portal OpenID Provider
Ownership
pkg/oidc owns the reusable provider. Provider is an exported concrete type;
OpenIDProvider is its public HTTP and browser-lifecycle interface. NewProvider
validates and snapshots Config, requires an IdentityVerifier, and accepts
runtime Options. The package has no dependency on the authn portal runtime.
config.go: publicConfig,ClientConfig, and validation.provisioning.go: public client constructors, credential generation,Config.AddClient, and dedicated signing-key generation in PEM or a new file.client_config_parser.go:NewClientConfigFromDirectives(nickname, statements)parses an OAuth application block body with the crypto-stylecfg.DecodeArgsencoding. Caddy adapters collect statements usingcfg.EncodeArgs.identity.go: publicAuthentication,Identity,IdentityVerifier, andOpenIDProvidercontracts.options.go: construction, configurable login URL, cookie names, and excluded signing keys;provider.go: bounded sessions, consent, and browser lifecycle.keys.go: dedicated RSA PEM loading, thumbprints, publicJWKS, signing, hints.http.go: publicServeHTTP,HandleHTTP,ValidateLoginRequest, andDiscovery, guarded issuer routing, parsing, CORS, and buffered responses.authorization.go,request_object.go,token.go: code/PKCE, consent, unsigned Request Objects, client authentication, UserInfo, and revocation.
pkg/authn/oidc_runtime.go supplies portalOIDCIdentityVerifier, local-realm
validation, key/cookie isolation, and sandbox/browser adapters. configureOIDC
runs after portal keys and optional refresh configuration. Portal.Close closes
the provider; Portal.GetOIDCProvider exposes its public interface.
pkg/authn/oidc_config.go retains OIDCProviderConfig and OIDCClientConfig as
aliases; PortalConfig.OIDCProvider keeps its oidc_provider serialization.
Read reusing the Go provider when embedding
pkg/oidc independently or changing its public API and identity boundary.
Read configuration and clients for
setup and operational constraints. Read conformance
for the targeted certification profiles, supported features, test evidence,
and the OpenID Foundation test-plan configuration.
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.
- yesterday First seen · 185 lines · 72 tokens per session scan A 3e659ad1dc8a
authentication-portal-oidc is a skill published in the GitHub repository greenpau/go-authcrunch (59 stars, last pushed yesterday), licensed Apache-2.0. It adds 72 tokens to every session and 2,470 once invoked, about $0.0004 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.
Other skills, from other repositories
mem0-oss-to-platform
Plan and then execute a migration of a project from the mem0 open-source / self-hosted SDK (the local Memory class) to the mem0 Platform / hosted / managed SDK (the MemoryClient class). Use this whenever a developer wants to move, switch, or migrate their mem0 usage off OSS/self-hosted to the hosted API — e.g.…
agui-dotnet-protobuf
Use the protobuf wire transport (instead of the default Server-Sent Events) for an AG-UI connection with the AG-UI .NET SDK — a compact binary event stream negotiated via the Accept header. USE FOR: making an AGUIChatClient prefer protobuf by wiring an AGUIEventStreamHandler with ProtobufEventStreamFormatter (then…
azure-mgmt-botservice-dotnet
Azure Resource Manager SDK for Bot Service in .NET. Management plane operations for creating and managing Azure Bot resources, channels (Teams, DirectLine, Slack), and connection settings. Triggers: "Bot Service", "BotResource", "Azure Bot", "DirectLine channel", "Teams channel", "bot management .NET", "create bot".
fastapi-router-py
Create FastAPI routers with CRUD operations, authentication dependencies, and proper response models. Use when building REST API endpoints, creating new routes, implementing CRUD operations, or adding authenticated endpoints in FastAPI applications.
aws-sdk-java-v2-core
Provides AWS SDK for Java 2.x client configuration, credential resolution, HTTP client tuning, timeout, retry, and testing patterns. Use when creating or hardening AWS service clients, wiring Spring Boot beans, debugging auth or region issues, or choosing sync vs async SDK usage.
telnyx-messaging-hosted-curl
Set up hosted SMS numbers, toll-free verification, and RCS messaging. Use when migrating numbers or enabling rich messaging features. This skill provides REST API (curl) examples.