Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add preset-io/agent-skills --skill preset-guest-tokensgit clone --depth 1 https://github.com/preset-io/agent-skillsWrote 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/preset-io/agent-skills/preset-guest-tokens)<a href="https://agentmods.dev/skills/preset-io/agent-skills/preset-guest-tokens"><img src="https://agentmods.dev/badge/skills/preset-io/agent-skills/preset-guest-tokens/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/preset-io/agent-skills/preset-guest-tokens"><img src="https://agentmods.dev/badge/skills/preset-io/agent-skills/preset-guest-tokens.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 | $0.00054 | $0.00384 |
| Opus 5 | $0.00027 | $0.00192 |
| Sonnet 5 | $0.00011 | $0.00077 |
| Haiku 4.5 | $0.00005 | $0.00038 |
Grade A, and why
preset-guest-tokens 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 13d 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.
What it actually says
preset-guest-tokens
Use for security-sensitive guest-token payload review and creation.
Always
- Auth and conventions come from
preset-api(JWT exchange, base URLs, Rison); resolve the workspace hostname through the Management API when it is not already known. Consultpreset-embeddingfor embedded-config context when it is missing. - Use
preset-embedded-rlswhen row-level security clauses are present. - Require explicit confirmation before
POST /api/v1/security/guest_token/. - Confirm dashboard/resource UUID, user claims, RLS clauses, token handling, and expiration expectations.
- Do not invent RLS clauses, trusted domains, or authorization details; ask for missing authorization details.
- Never print signed guest tokens in logs, examples, PR comments, or handoff notes.
Decision Rules
- Classify guest token creation as token issuance.
- Require approval summary with dashboard, resource, user, RLS, audience, expiration, and handling.
- Never create or print a signed token before approval.
- Separate embedded config reads from token creation.
Workflow Order
- Inspect dashboard and embedded config metadata.
- Summarize token claims, resources, user payload, RLS, audience, and handling.
- Request explicit approval.
- Stop before creating or printing token.
Retrieve
- Guest-token claims, resources, user payload, RLS, token handling: references/guest-token-claims.md
- Approval policy: load
preset-apiand thenreferences/safety-policy.md.
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.
- 13d ago First seen · 37 lines · 54 tokens per session scan A b07dd2242380
preset-guest-tokens is a skill published in the GitHub repository preset-io/agent-skills (11 stars, last pushed yesterday), licensed Apache-2.0. It adds 54 tokens to every session and 384 once invoked, about $0.0003 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 2026-08-30.
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