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 | $0.00041 | $0.02039 |
| Opus 5.5 | $0.00016 | $0.00816 |
| Sonnet 5.5 | $0.00008 | $0.00408 |
| Haiku 4.5 | $0.00004 | $0.00204 |
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 17d 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 — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Refresh Token Identity
Read provider snapshot renewal when changing OAuth/OIDC-originated portal families, provider revalidation configuration, captured claims, or their persistence. That evidence has a separate typed source; local credential-version and profile authority must never be fabricated for it.
Canonical Identity and Transformed Claims
Keep backend identity independent of output claim transformations.
createSandboxUser captures user.User.LoginUsername and LoginEmail from
the identified backend before transformation, alongside LoginEvidence.
These fields are excluded from JSON/XML/YAML and retained by User.Clone and
single-use sandbox redemption. HTML and JSON checkpoints use this canonical
identity; neither transformed sub/email nor a caller-supplied alias may select
another account. JSON continuation compares the newly identified canonical
username with the sandbox, so username, email, and case aliases can refer to
the same record across checkpoints.
token_issuer.go revalidates local access-only proofs through
WithRefreshIdentity, holding the backend transaction through current claim
transformation, challenge-policy checks, and signing. Compare current username
and email with the canonical sandbox fields, never transformed claims. Security
version changes, reloads, deleted/recreated accounts, or newly required factors
deny issuance. Credential mutation during an outstanding login, including MFA
enrollment, requires a new completed login. The SQLite identity-store plugin
supplies the same optional transaction
capability with its own immutable IDs, versions and per-instance epochs.
Stores without that capability retain their IdentifyUser contract and canonical
username/email comparison; this fallback
does not promise transactional credential-version verification.
HTML and JSON access-only login both support email claim transformations.
Access-only token claims are transformed anew
from current attributes and retain the configured access lifetime. Renewable
access keeps its canonical sub; OIDC keeps its immutable derived subject and
backend UserInfo attributes. A transformed subject never becomes a backend
lookup key or an OIDC/refresh proof username.
What ships with it
2 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.
- 17d ago Changed · +26 lines fe4e0bf81453
- 26d ago Changed · +5 lines · +5 tokens per session a24096fefaeb
- 29d ago Changed · +3 lines 6040e2338a8f
- 1mo ago Changed · +9 lines cc331353cf21
- 1mo ago Changed 8ce9b48d625a
- 1mo ago Changed · +2 lines 646d93b504dd
- 1mo ago Changed · +7 lines 148366688f85
- 1mo ago Changed · +9 lines 03ab2bb61b51
- 1mo ago Changed · +39 lines ef26bb90c63f
- 1mo ago 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 (60 stars, last pushed 10d ago), licensed Apache-2.0. It adds 41 tokens to every session and 2,039 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.
refresh-token-identity compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| refresh-token-identitygreenpau/go-authcrunch | Skill | 60 | 10d ago | Apache-2.0 | A | 41 | 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 |