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gemini

gemini is a skill for Claude Code from tonydzi/second-brain-starter-kit. It costs 74 tokens per session (1,402 once invoked), scanned B, original, MIT.

A coding helper that uses Google Gemini as an independent third reviewer alongside other AI reviewers. It can inspect code changes and act as a testing critic after a build.

In plain words
What is it for?
Use it for repository diff reviews, architecture or plan reviews, and breaking-test checks that return a clear accept, counter, or block verdict.
Why use it?
It provides another perspective when reviewers disagree, one reviewer is unavailable, or the work needs an additional safety check.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions Codex; mentions Gemini CLI.

Part of the second-brain-skills plugin — 248 skills, 3 agents, 1 plugin shipped together

not rated 12repo +3 changed 2d ago B scan 74 tokens original MIT

Good fit Use it for repository diff reviews, architecture or plan reviews, and breaking-test checks that return a clear accept, counter, or block verdict.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/tonydzi/second-brain-starter-kit/gemini
View source ↗ tonydzi/second-brain-starter-kit
Install

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.

Any agent
npx skills add tonydzi/second-brain-starter-kit --skill gemini
Clone the repo
git clone --depth 1 https://github.com/tonydzi/second-brain-starter-kit

Made for: Claude Code.

Or install second-brain-skills, the plugin that ships this one along with the rest of its 248 skills, 3 agents, 1 plugin.

Wrote 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.

agentmods badge for gemini

README.md
[![agentmods](https://agentmods.dev/badge/skills/tonydzi/second-brain-starter-kit/gemini/github.svg)](https://agentmods.dev/skills/tonydzi/second-brain-starter-kit/gemini)
Your own site
<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.

agentmods 80×15 button for gemini

Your own site · 80×15
<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>
Per session 74 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,402 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00074 $0.01402
Opus 5.5 $0.00030 $0.00561
Sonnet 5.5 $0.00015 $0.00280
Haiku 4.5 $0.00007 $0.00140

Measured 2d ago against content hash b1e5e4d809fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2d 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"`).
skills/gemini/SKILL.md · 79 lines

How it starts

The opening of the file, as written. The whole thing — 79 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 is ACCEPT (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 explicit log-skip).
  • review: VERDICT: APPROVE | REQUEST_CHANGES + a report review-gemini-<ts>.md next to the repo.
  • The rail did not answer → the script writes a skip into usage.jsonl itself and prints ⚠️: the /tt verdict is then ⚠️ PARTIAL at best, never ✅. A missed call ≠ a green test.

Read the full file on GitHub · 79 lines

Changes

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.

  1. 2d ago Changed b1e5e4d809fd
  2. 15d ago Changed · -1 lines 0bb6cba2fba3
  3. 20d ago Changed · -24 lines · -74 tokens per session 35df1229de21
  4. 21d ago Changed f521d43441e7
  5. 29d ago Changed · +22 lines · +74 tokens per session 9f16e9e8d702
  6. 1mo ago Changed · +1 lines · -31 tokens per session 92ab8015f722
  7. 1mo ago First seen · 81 lines · 105 tokens per session scan B dd4945b362bf

Subscribe to this mod's changes

gemini is a skill published in the GitHub repository tonydzi/second-brain-starter-kit (12 stars, last pushed today), licensed MIT. It adds 74 tokens to every session and 1,402 once invoked, about $0.0003 per session on Opus 5.5. 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.

Claude CodeCode reviewTestingai-agentsknowledge-managementobsidianpersonal-knowledge-managementsecond-brain
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