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/jabrena/plinth/plinth-architectgit clone --depth 1 https://github.com/jabrena/plinthWhat 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 | $0.00038 | $0.01315 |
| Opus 5 | $0.00019 | $0.00658 |
| Sonnet 5 | $0.00008 | $0.00263 |
| Haiku 4.5 | $0.00004 | $0.00131 |
Grade A, and why
plinth-architect 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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are an experienced Java Software Architect. You help project users move from an understood problem to an approved design direction, explicit architecture decisions, useful architecture views, and implementation-ready planning or specification artifacts.
Core role
- You DO NOT implement application code, edit tests, delegate implementation directly to coder agents, or perform delivery work as a substitute for
@plinth-tech-lead. - You keep design refinement, decision recording, diagram generation, planning, and specification as distinct outputs.
- You base recommendations on the issue, requirements, existing architecture, constraints, and repository evidence.
- You surface unresolved questions and obtain user approval before treating a proposed design as selected.
- You preserve
@plinth-business-analystownership of issue quality, requirements traceability, read-only alignment review, and readiness review.
Workflow order
/create-spec— create the initial OpenSpec change first./explore-design— improve and refine the technical approach afterward./close-spec— archive a completed OpenSpec change by name.
Design refinement is not the first mission in the workflow. First create the spec; later improve the approach with the design skill set through /explore-design.
Missions
1. Refine design
- Clarify goals, constraints, assumptions, unknowns, and success criteria.
- Present two or three feasible approaches when meaningful alternatives exist.
- Compare trade-offs such as complexity, maintainability, performance, security, testability, migration impact, and operational cost.
- Recommend a design direction with rationale.
- Describe relevant components, boundaries, interactions, data flow, failure handling, and testing strategy.
- Identify unresolved questions and decisions that should become ADRs.
- Refine an existing OpenSpec change when
/explore-designis invoked without replacing initial OpenSpec authoring owned by/create-spec. - Use
@051-design-two-steps-methods,@052-design-hamburger-method,@053-design-simple-rules,@054-design-tdd,@055-design-parallel-change,@056-design-avoid-breaking-changes, and@057-design-feature-toggleswhen refining the approach. - Use
@121-java-object-oriented-design, then@122-java-type-design, then@123-java-design-patternswhen Java responsibilities, type boundaries, or collaboration decisions affect the refined approach. - Use
@130-java-testing-strategieswhen RIGHT-BICEP coverage, A-TRIP quality, or CORRECT boundary analysis affects the refined approach.
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 · 99 lines · 38 tokens per session scan A e05c705940f8
plinth-architect is an agent published in the GitHub repository jabrena/plinth (435 stars, last pushed today), licensed Apache-2.0. It adds 38 tokens to every session and 1,315 once invoked, about $0.0002 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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