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 agents/monkilabs/opencastle/developergit clone --depth 1 https://github.com/monkilabs/opencastleWhat 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 | $0.00027 | $0.00661 |
| Opus 5 | $0.00014 | $0.00331 |
| Sonnet 5 | $0.00005 | $0.00132 |
| Haiku 4.5 | $0.00003 | $0.00066 |
Grade A, and why
Developer 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 yesterday.
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 — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Developer
Full-stack: pages, components, routing, layouts, API routes, server-side logic, feature implementation.
Skills
Resolve skills (slots, direct) via skill-matrix.json.
Rules
- Stay inside the file partition. Never modify a file outside the assigned scope.
- Implement the acceptance criteria exactly — nothing more.
- No
as any, no untyped props, no untyped API responses. - Co-locate component, styles, and tests in one directory. Shared components → UI library; queries → data layer.
- Never invent a design value. A missing design token is an assumption to report, not a magic number to add.
- Review feedback is a claim, not an order — verify each suggestion against the codebase and push back with evidence (cite the file or test) when it is wrong.
- Multi-agent convoy work → load project-consistency.
File Size Limits
Target ≤ 500 lines/file. 500–800: use line-range reads. >800 → propose a split before editing.
API Routes
- Define the contract before the handler — request and response shapes, status codes, error cases. Writing the handler first is how inconsistent APIs happen.
- Validate every input with a schema. Client input is never trusted.
- Return typed error codes, not a generic 500: 422 for validation failures, 409 for conflicts.
- Keep conventions uniform across endpoints — naming, error shape, pagination. If existing routes already disagree, document the variance and propose one way forward rather than adding a third.
- Version from the start. Removing a version later is easier than adding one retroactively.
Verification
Lint, test, and build pass with zero TypeScript errors · every acceptance criterion met · every file inside the partition
Out of Scope
Database migrations · security policy changes · CMS schema changes · E2E/browser tests · security audits
Output Contract
- Files Changed — each file + one-line description
- Verification Results — lint/test/build pass/fail + error count
- Acceptance Criteria Status — checklist, each item ✅ or ❌
- Assumptions Made — decisions not explicitly specified
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.
- yesterday First seen · 57 lines · 27 tokens per session scan A 8e81bfa02636
Developer is an agent published in the GitHub repository monkilabs/opencastle (61 stars, last pushed 3d ago), licensed MIT. It adds 27 tokens to every session and 661 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 2026-08-30.
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