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 tonydzi/second-brain-starter-kit --skill geminigit clone --depth 1 https://github.com/tonydzi/second-brain-starter-kitWrote 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/tonydzi/second-brain-starter-kit/gemini)<a href="https://agentmods.dev/skills/tonydzi/second-brain-starter-kit/gemini"><img src="https://agentmods.dev/badge/skills/tonydzi/second-brain-starter-kit/gemini/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/tonydzi/second-brain-starter-kit/gemini"><img src="https://agentmods.dev/badge/skills/tonydzi/second-brain-starter-kit/gemini.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 | $0.00105 | $0.01323 |
| Opus 5 | $0.00053 | $0.00661 |
| Sonnet 5 | $0.00021 | $0.00265 |
| Haiku 4.5 | $0.00011 | $0.00132 |
Grade B, and why
gemini scanned grade B with 1 finding 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 8d 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
(`~/.gemini/settings.json` → `security.auth.selectedType: "gemini-api-key"`). How it starts
The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
gemini — the third vendor in the "second pair of eyes"
Its siblings: Codex (secondop.py / codex_review.py, the default) and Grok
(grok_review.py, a CLI on the hub). Gemini is the third independent vendor: it rescues the
verdict when Codex has burned through its quota, and as a hetero-pair it breaks what the other two
never saw.
When I call it
- In /tt Step 2.5, rail 3: Codex unavailable/quota-blocked · a contested COUNTER · a safety-critical artifact (call two or three of them) · the operator says "ask Gemini".
- Diff review alongside
cc_review.py/codex_review.py/grok_review.py. - A third voice on architecture/plan review when Claude and Codex disagree.
How (headless, no browser)
The breaker for /tt (the verdict is logged into secondop automatically, no manual log-ext needed):
python "%USERPROFILE%\.claude\scripts\cc-review\gemini_review.py" break --task <task-id> --context "<what we built + what has already been checked>"
Diff review:
python "%USERPROFILE%\.claude\scripts\cc-review\gemini_review.py" review --repo "<path to the repo>"
Is the rail alive (before the ritual leans on it):
python "%USERPROFILE%\.claude\scripts\cc-review\gemini_review.py" doctor
Flags: --range "HEAD~1 HEAD" · --diff <patch> · --task <task.md> (what was asked for) ·
--model <model> · --engine cli|rest · --timeout S · --no-log (break without writing to usage.jsonl).
How to read the answer
break: the first line isACCEPT(agreement) ·COUNTER/BLOCK(a finding → that is /tt Step 4: root cause → fix → re-run, not "an opinion noted for the record"). An unrecognized verdict → exit 3, the external eye does NOT count (ask again in the right format, or log an explicitlog-skip).review:VERDICT: APPROVE | REQUEST_CHANGES+ a reportreview-gemini-<ts>.mdnext to the repo.- The rail did not answer → the script writes a skip into
usage.jsonlitself and prints ⚠️: the /tt verdict is then ⚠️ PARTIAL at best, never ✅. A missed call ≠ a green test.
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.
- 8d ago First seen · 81 lines · 105 tokens per session scan B dd4945b362bf
gemini is a skill published in the GitHub repository tonydzi/second-brain-starter-kit (5 stars, last pushed 9d ago), licensed MIT. It adds 105 tokens to every session and 1,323 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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