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 mtvrkan/senior-dev-kit --skill feature-buildgit clone --depth 1 https://github.com/mtvrkan/senior-dev-kitWrote 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/mtvrkan/senior-dev-kit/feature-build)<a href="https://agentmods.dev/skills/mtvrkan/senior-dev-kit/feature-build"><img src="https://agentmods.dev/badge/skills/mtvrkan/senior-dev-kit/feature-build.svg" alt="Measured on agentmods" 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 | $0.00023 | $0.00351 |
| Opus 5 | $0.00012 | $0.00176 |
| Sonnet 5 | $0.00005 | $0.00070 |
| Haiku 4.5 | $0.00002 | $0.00035 |
Grade A, and why
feature-build 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 6d 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.
What it actually says
feature-build
-
2 files → 3-line inline plan (goal / files / approach) first. New file → read 1 similar file, match patterns exactly. Check it doesn't already exist.
- UI work: read
DESIGN-SPEC.md+PROJECT-CONTRACTS.mdif present (project root — written by thefrom-scratchskill; absent on projects not bootstrapped with it, skip). Independent file edits → single parallel message. - Auto-test: backend (service/controller/handler/repo) →
jest [file].spec.ts --no-coverage, no spec → add 3 tests (happy+edge+error). Mobile/API route → targeted test. Pure UI → TEST: skipped. - Hard stop: auth/payment/DB schema/migrations/secrets/CI → escalate, don't implement. No new deps without justification.
Do not use for: bug fixes (bug-fix), pure UI tweaks (ui-change), large/architectural features (feature-plan first), or greenfield projects (from-scratch).
Output
· [file:line — what changed]
TEST: [command — ✓ N passed | skipped (UI-only)]
VERIFY: [lint or build — ✓] | RISK: low | medium · feature-build
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.
- 6d ago First seen · 25 lines · 23 tokens per session scan A 47495c68920f
feature-build is a skill published in the GitHub repository mtvrkan/senior-dev-kit (5 stars, last pushed 6d ago), licensed MIT. It adds 23 tokens to every session and 351 once invoked, about $0.0001 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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