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 mtvrkan/senior-dev-kit/plugin install 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/kit-doctor)<a href="https://agentmods.dev/skills/mtvrkan/senior-dev-kit/kit-doctor"><img src="https://agentmods.dev/badge/skills/mtvrkan/senior-dev-kit/kit-doctor/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/mtvrkan/senior-dev-kit/kit-doctor"><img src="https://agentmods.dev/badge/skills/mtvrkan/senior-dev-kit/kit-doctor.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 | $0.00028 | $0.00551 |
| Opus 5 | $0.00014 | $0.00275 |
| Sonnet 5 | $0.00006 | $0.00110 |
| Haiku 4.5 | $0.00003 | $0.00055 |
Grade A, and why
kit-doctor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
kit-doctor
Diagnose the installation. Read-only — propose fixes, never apply them unasked.
- LOCATE: is the kit installed as a plugin (
claude plugin list), copied into~/.claude/, or both? Does the project.claude/exist? Report every scope found, and print the absolute plugin root (${CLAUDE_PLUGIN_ROOT}) when installed that way — that is wherepresets/lives for plugin users. If the plugin is present but~/.claude/rules/is not, say that path-scoped rules are inactive and/kit-setupfixes it. - COUNT: every directory component the installer copies —
agents/ skills/ commands/ rules/ agent_docs/ presets/, i.e. the directory-shaped entries ofCOMPONENTSinscripts/lib/install-core.mjs— against the shipped counts in the kit README. Flag shortfalls (truncated copy) and extras (user additions, not errors). - SETTINGS:
settings.jsonparses as JSON? Ispermissions.denypresent, with at least as many rules asSECURITY.mdstates? Read that number fromSECURITY.mdat run time — it is pinned tosettings-template.jsonbycheck-consistency.ts, so it is always the live count. Never hardcode a floor here. - VERSION:
CLAUDE.md/.claude/stack-rules.mdpresent? compare installed content markers against the kit's currentpackage.jsonversion. - ROUTING: every agent named in global-CLAUDE.md's AGENT ROUTING section (prose with
signal → agentarrows, not a table) exists asagents/<name>.mdon disk.
Output
COMPONENT | EXPECTED | FOUND | ✓/⚠/✗ (one row per component, per scope)
VERDICT: healthy | degraded — [list] | broken — [list]
FIX: [exact re-copy command for the missing/stale component per ✗]
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.
- 8d ago First seen · 29 lines · 28 tokens per session scan A 7f518a071cfe
kit-doctor is a skill published in the GitHub repository mtvrkan/senior-dev-kit (5 stars, last pushed yesterday), licensed MIT. It adds 28 tokens to every session and 551 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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