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 jdrhyne/agent-skills --skill geminigit clone --depth 1 https://github.com/jdrhyne/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/jdrhyne/agent-skills/gemini)<a href="https://agentmods.dev/skills/jdrhyne/agent-skills/gemini"><img src="https://agentmods.dev/badge/skills/jdrhyne/agent-skills/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/jdrhyne/agent-skills/gemini"><img src="https://agentmods.dev/badge/skills/jdrhyne/agent-skills/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 | $0.00053 | $0.02608 |
| Opus 5 | $0.00026 | $0.01304 |
| Sonnet 5 | $0.00011 | $0.00522 |
| Haiku 4.5 | $0.00005 | $0.00261 |
Grade A, and why
gemini 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 9d 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.
This is a copy
95% identical to gemini — 15 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 233 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Gemini Skill Guide
When to Use Gemini
- WHEN ASKED TO BE ACTIVATED
- Code Review: Comprehensive code reviews across multiple files
- Plan Review: Analyzing architectural plans, technical specifications, or project roadmaps
- Big Context Processing: Tasks requiring >200k tokens of context (entire codebases, documentation sets)
- Multi-file Analysis: Understanding relationships and patterns across many files
⚠️ Critical: Background/Non-Interactive Mode Warning
NEVER use --approval-mode default in background or non-interactive shells (like Claude Code tool calls). It will hang indefinitely waiting for approval prompts that cannot be provided.
For automated/background reviews:
- ✅ Use
--approval-mode yolofor fully automated execution - ✅ OR wrap with timeout:
timeout 300 gemini ... - ❌ NEVER use
--approval-mode defaultwithout interactive terminal
Symptoms of hung Gemini:
- Process running 20+ minutes with 0% CPU usage
- No network activity
- Process state shows 'S' (sleeping)
Fix hung process:
# Check if hung
ps aux | grep gemini | grep -v grep
# Kill if necessary
pkill -9 -f "gemini.*gemini-3-pro-preview"
Running a Task
-
Ask the user (via
AskUserQuestion) which model to use in a single prompt. Available models:gemini-3-pro-preview⭐ (flagship model, best for coding & complex reasoning, 35% better at software engineering than 2.5 Pro)gemini-3-flash(sub-second latency, distilled from 3 Pro, best for speed-critical tasks)gemini-2.5-pro(legacy option, strong all-around performance)gemini-2.5-flash(legacy option, cost-efficient with thinking capabilities)gemini-2.5-flash-lite(legacy option, fastest processing)
-
Select the approval mode based on the task:
default: Prompt for approval (⚠️ ONLY for interactive terminal sessions)auto_edit: Auto-approve edit tools only (for code reviews with suggestions)yolo: Auto-approve all tools (✅ REQUIRED for background/automated tasks)
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.
- 9d ago First seen · 233 lines · 53 tokens per session scan A c701e3c038ff
gemini is a skill published in the GitHub repository jdrhyne/agent-skills (241 stars, last pushed 10d ago), licensed MIT. It adds 53 tokens to every session and 2,608 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 95% identical to gemini, differing in 15 lines, and is treated as a copy.
Other skills, from other repositories
auto-review
A code-review skill that examines changed code using the TRUST 5 criteria and automated checks. It can review files, commit ranges, or changes assigned a risk level, with optional review strategies and providers.
ax-annotation
@AX code annotation workflow skill for agent-driven tag application.
ddd
A development method for improving existing code while preserving its current behavior. It follows an analyze, preserve, and improve cycle, using tests and small changes to reduce unintended effects.
verify
Answer "is this shippable / done?" with evidence before a commit or PR — fires on "verify", "is this done", "ready to ship?", pre-commit or pre-PR. Part of the Agentsmith harness; runs the project's verify phases and never claims "passing" without showing the output (R5).
review
A structured checklist for reviewing software code. It covers tests, readability, consistency, security, and whether changes can be tracked.
refactoring
A set of techniques for improving code structure while keeping its existing behavior unchanged. Refactoring means reorganizing code without intentionally changing what it does.