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 agentmods add skills/gabonio/agent-operator-toolkit/builder-kitnpx skills add gabonio/agent-operator-toolkit --skill builder-kitgit clone --depth 1 https://github.com/gabonio/agent-operator-toolkitWhat 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 | $0.00071 | $0.00749 |
| Opus 5 | $0.00036 | $0.00375 |
| Sonnet 5 | $0.00014 | $0.00150 |
| Haiku 4.5 | $0.00007 | $0.00075 |
Grade A, and why
builder-kit 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 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.
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 — 48 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Builder Kit
Use this skill as a thin router. Do not load every reference.
Start
- Read profiles and resolve the communication and delivery profiles.
- Read task classification.
- Inspect repository instructions, neighboring code, tests, build files, documentation, branch, and uncommitted changes.
- Explain the classification and proposed lens set in language appropriate to the communication profile. Let the user override optional lenses and classification.
- Apply the authority order in authority and legacy guidance.
For a tiny fix, make the smallest coherent change when implementation is requested, then use verification. For planned work, read and follow the develop-from-spec instructions and stop at its approval gate.
Conditional routing
| Trigger | Read or invoke |
|---|---|
| Select expert concerns | lens routing, then only selected lens files |
| Data, APIs, search, lists, caches | data boundaries |
| Auth, integrations, external services | integration boundaries |
| Secrets, permissions, sensitive data | security and privacy |
| Frontend styling or components | frontend composition |
| Mutations, concurrency, migrations | reliability and evolution |
| Java, frontend, Python, C++, Jenkins | Only the matching file under ../../references/standards/ |
| Specialized platform or service work | external capability routing, then invoke an available owning skill |
| Prototype project | prototype delivery |
| New application | start-new-app instructions |
| Challenge assumptions or readiness | adversarial-review instructions |
| Standard code/design review | standard review |
| Repeated review of current changes | PR review loop instructions |
| Maintaining or releasing Builder Kit | release and update policy |
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.
- 2d ago First seen · 48 lines · 71 tokens per session scan A 00852fcdd199
builder-kit is a skill published in the GitHub repository gabonio/agent-operator-toolkit (1 stars, last pushed 28d ago), licensed MIT. It adds 71 tokens to every session and 749 once invoked, about $0.0004 per session on Opus 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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