Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add stellarshenson/claude-code-plugins/plugin install autobuildWrote 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/stellarshenson/claude-code-plugins/autobuild)<a href="https://agentmods.dev/skills/stellarshenson/claude-code-plugins/autobuild"><img src="https://agentmods.dev/badge/skills/stellarshenson/claude-code-plugins/autobuild/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/stellarshenson/claude-code-plugins/autobuild"><img src="https://agentmods.dev/badge/skills/stellarshenson/claude-code-plugins/autobuild.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 | $0.00080 | $0.02279 |
| Opus 5.5 | $0.00032 | $0.00912 |
| Sonnet 5.5 | $0.00016 | $0.00456 |
| Haiku 4.5 | $0.00008 | $0.00228 |
Grade A, and why
autobuild 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 20d 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.
How it starts
The opening of the file, as written. The whole thing — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Autobuild - Autonomous Iteration Orchestrator
Breaks improvement work into phases. Spawns agent panels per stage. Enforces quality via two independent gates. Use for iteration, quality improvement, bug fixes, refactors, GC, feature implementation.
Solves:
- Shallow fixes - forces research and hypothesis before implementation
- Scope creep - plan locks scope, review catches deviations
- Benchmark overfit - guardian agent blocks benchmark-specific tuning
- Lost context - hypothesis catalogue persists across iterations
- Unchecked quality - two independent gates catch incomplete work
- No accountability - every phase logs agents, outputs, verdicts in YAML
Phase instructions, agent definitions, exit criteria live in resources/. Run start to see what each phase requires.
Pre-flight install (MANDATORY - run every session, no asking)
Always run this single line BEFORE invoking orchestrate. No-op when the package is already importable; auto-installs when missing OR when a stale shim is on PATH but the package is uninstalled in the active Python:
python3 -m pip install --user --upgrade stellars-claude-code-plugins 2>&1 | tail -1
LIB=$(python3 -c "import importlib.metadata as m;print(m.version('stellars-claude-code-plugins'))" 2>/dev/null) || { echo "FATAL: toolkit unavailable"; exit 1; }
PLUG=$(grep -m1 '"version"' "${CLAUDE_PLUGIN_ROOT}/.claude-plugin/plugin.json" 2>/dev/null | cut -d'"' -f4)
OLDER=$(printf '%s\n%s\n' "$LIB" "$PLUG" | sort -V | head -1)
[ -n "$PLUG" ] && [ "$LIB" != "$PLUG" ] && [ "$OLDER" = "$LIB" ] && { echo "STALE: library $LIB older than plugin $PLUG - refusing to run on an outdated CLI; re-run the upgrade"; exit 1; }
echo "toolkit $LIB"
Run the CLI without touching the caller's project. The gate above puts it on PATH, so the bare command name is the whole invocation. uv run instead resolves whatever project the working directory sits in and writes uv.lock and .venv into it, so if you reach for uv pass --no-project (uv run --no-project <cli> ...) - it skips project discovery, leaves the tree untouched and still finds the same PATH binary. --no-sync and --frozen are not substitutes; both still create .venv.
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.
- 20d ago Changed 7fe32c571d0b
- 1mo ago First seen · 195 lines · 80 tokens per session scan A e58900489383
autobuild is a skill published in the GitHub repository stellarshenson/claude-code-plugins (4 stars, last pushed today), licensed MIT. It adds 80 tokens to every session and 2,279 once invoked, about $0.0003 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 2026-08-31.
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