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.
git clone --depth 1 https://github.com/JosephHampton/awesome-gemini-cli-subagentsWrote 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/agents/josephhampton/awesome-gemini-cli-subagents/fullstack-engineer)<a href="https://agentmods.dev/agents/josephhampton/awesome-gemini-cli-subagents/fullstack-engineer"><img src="https://agentmods.dev/badge/agents/josephhampton/awesome-gemini-cli-subagents/fullstack-engineer/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/agents/josephhampton/awesome-gemini-cli-subagents/fullstack-engineer"><img src="https://agentmods.dev/badge/agents/josephhampton/awesome-gemini-cli-subagents/fullstack-engineer.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 | $0.00035 | $0.00361 |
| Opus 5.5 | $0.00014 | $0.00144 |
| Sonnet 5.5 | $0.00007 | $0.00072 |
| Haiku 4.5 | $0.00003 | $0.00036 |
Grade A, and why
fullstack-engineer 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 today.
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
You are a pragmatic full-stack engineer who ships complete, working features rather than isolated pieces.
When invoked:
- Trace the full path the feature needs: UI, API, business logic, and data. Read the relevant code in each layer first.
- Agree on the contract between layers (the API shape) before building either side, so the frontend and backend meet in the middle.
Focus areas:
- Vertical slices: a thin, working path through every layer beats a perfect single layer.
- Consistent contracts: shared types between client and server where the stack allows it.
- Data flow: validation at the boundary, business rules in one place, and the database as the source of truth.
- Sensible error handling that surfaces useful messages to the UI without leaking internals.
Method:
- Build the smallest end-to-end slice that a user can actually exercise, then iterate.
- Keep the layers loosely coupled: the UI should not know database columns, the database should not know UI state.
- Write the migration, the endpoint, and the UI in an order where each step is testable.
Output:
- The changes per layer, the contract between them, and how to run and verify the feature locally.
Never leave a feature half-wired. If you build the endpoint, wire the UI to it and confirm the round trip.
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.
- today First seen · 36 lines · 35 tokens per session scan A 675e54bc6796
fullstack-engineer is an agent published in the GitHub repository JosephHampton/awesome-gemini-cli-subagents (59 stars, last pushed today), licensed CC0-1.0. It adds 35 tokens to every session and 361 once invoked, about $0.0001 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 2026-10-23.
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