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-transports/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-transports)<a href="https://agentmods.dev/skills/greenpau/go-authcrunch/refresh-token-transports"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/refresh-token-transports/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-transports"><img src="https://agentmods.dev/badge/skills/greenpau/go-authcrunch/refresh-token-transports.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 | $0.00037 | $0.00982 |
| Opus 5 | $0.00018 | $0.00491 |
| Sonnet 5 | $0.00007 | $0.00196 |
| Haiku 4.5 | $0.00004 | $0.00098 |
Grade A, and why
refresh-token-transports 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 — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Refresh Token Transports
HTTP Ownership
pkg/authn/handle_api_refresh_token.go owns refresh and logout parsing,
transport checks, response delivery, cookie creation/deletion, and revocation of
an earlier browser family. respond_api.go dispatches these reserved routes
before ordinary access authorization so expired access tokens can renew or log
out. Preserve authorization and access-expiry checks on all other APIs.
Routes are POST <mount>/api/refresh_token and <mount>/api/logout.
Require the exact configured HTTPS origin, effective host, and canonical mount.
Browser requests require matching Origin, X-Authcrunch-Refresh: 1, JSON,
and compatible Fetch Metadata. Reject query parameters, unknown/duplicate JSON
fields, trailing data, bodies over 1 KiB, duplicate refresh cookies, and mixed
cookie/body credentials. Embedding servers still own forwarded-host/protocol
normalization; never broaden trust merely to make a proxy setup pass.
Cookie transport returns session/expiry metadata only. Refresh cookies are
Secure, HttpOnly, host-only, SameSite=Lax, and mount-scoped; __Host- requires
root scope. Access cookies retain configured domain/path with bounded access
expiry. Refresh cookie lifetime is independent of access cookie configuration.
Responses use Cache-Control: no-store.
Native body transport requires explicit config and refresh_transport: body
at initial JSON login and every sandbox checkpoint. Pin that choice through
issuance and rotation. Reject browser Origin, Fetch Metadata, and Cookie
headers for native requests; return credentials in JSON and set no cookies.
Never accept a cookie-family token through body transport or vice versa.
API key JSON /login is a separate access-only path owned by
authentication-client. It does not enter sandbox refresh issuance, sets no
cookies, and rejects refresh_transport: body, even in a refresh-enabled realm.
Do not treat possession of an API key as completed password/MFA login evidence.
Use the status contract: 400 malformed/ambiguous request, 401 login required, 403 origin/transport violation, 404 disabled/wrong mount, 405 wrong method, 415 wrong content type, and 503 transient signing/storage/backend failure. No response delivers credentials before the store commits.
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 · 85 lines · 37 tokens per session scan A 6f9291e6e685
refresh-token-transports is a skill published in the GitHub repository greenpau/go-authcrunch (59 stars, last pushed yesterday), licensed Apache-2.0. It adds 37 tokens to every session and 982 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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