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/refresh-token-identity/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/refresh-token-identity)<a href="https://agentmods.dev/skills/greenpau/go-authcrunch/refresh-token-identity"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/refresh-token-identity/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/refresh-token-identity"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/refresh-token-identity.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 | $0.00036 | $0.00740 |
| Opus 5 | $0.00018 | $0.00370 |
| Sonnet 5 | $0.00007 | $0.00148 |
| Haiku 4.5 | $0.00004 | $0.00074 |
Grade A, and why
refresh-token-identity 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 — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Refresh Token Identity
Ownership and Evidence
pkg/authn/login_proof.go, sandbox_user.go, handle_http_sandbox.go, and
handle_json_login.go carry login evidence into the shared issuer.
pkg/authn/cache/sandbox.go owns Acquire, SandboxLease, and single-use
Redeem. Serialize a sandbox request through its lease; successful checkpoint
checks alone do not prevent two requests from minting two refresh families.
Capture immutable user ID, credential version, and backend reload epoch when
identification/authentication begins. Record actual successful authentication
time and method on the server and retain them through MFA. JSON input and
transformed claims cannot supply or upgrade this evidence. Keep
requests.AuthenticationEvidence and the private fields on user.User out of
JSON/XML/YAML; preserve the relevant fields when cloning a user.
Every required checkpoint must pass before redemption and issuance. MFA enrollment mutates credentials and is not proof of authentication with the new factor: require a new completed login. A reset or policy change between password verification and MFA must invalidate the pending evidence. Password, API key, TOTP, WebAuthn, SSH, and GPG paths must record only methods actually verified. Do not infer authentication strength from display/profile attributes.
Local Identity Contract
pkg/identity/refresh.go owns RefreshIdentity, WithRefreshIdentity, and
credential-version invalidation. pkg/ids/local/refresh.go is the adapter and
exposes RevokeUserSessions(ctx, immutableUserID). The persisted
identity.User.CredentialVersion defaults to zero for legacy files; new security
mutations advance it without rewriting every existing account in bulk.
In pkg/identity/database.go, password change/reset/update, MFA add/delete,
account disable/enable, and challenge-rule changes must invalidate captured
versions. Explicit session revocation uses the same boundary. Deletion denies
lookup; recreating a username must not reuse its immutable ID. Database reload
changes LoadedAt evidence so restoring an older file cannot restore refresh
eligibility.
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 · 68 lines · 36 tokens per session scan A 371c5c364d10
refresh-token-identity is a skill published in the GitHub repository greenpau/go-authcrunch (59 stars, last pushed yesterday), licensed Apache-2.0. It adds 36 tokens to every session and 740 once invoked, about $0.0002 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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