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 blockmatic/basilic --skill plan-architecturegit clone --depth 1 https://github.com/blockmatic/basilicWrote 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/blockmatic/basilic/plan-architecture)<a href="https://agentmods.dev/skills/blockmatic/basilic/plan-architecture"><img src="https://agentmods.dev/badge/skills/blockmatic/basilic/plan-architecture.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00026 | $0.00278 |
| Opus 5 | $0.00013 | $0.00139 |
| Sonnet 5 | $0.00005 | $0.00056 |
| Haiku 4.5 | $0.00003 | $0.00028 |
Grade A, and why
plan-architecture 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.
What it actually says
Purpose and inputs
Produce an implementation-structure plan for the user's question. Durable system decomposition and ADRs belong to /f-architecture and ARCHITECTURE.md. Do not mint a second ADR tree.
Steps
- Load FIRST and read the architecture overlay plus matching technical MDX. If the change is a durable boundary, stop and use
/f-architecture. - State implementation goals vs nice-to-haves. Stay inside the existing architecture unless the user already authorized a station decision.
- List constraints, trade-offs, and alternatives that affect this change. Flag high-risk items for a human.
- Add Mermaid only when structure or flow is otherwise unclear.
- Save only if the user gave a path; otherwise return in chat. Include assumptions and References. Do not create a branch.
Verification
- The plan does not replace
ARCHITECTURE.mdor invent an ADR location. - Assumptions and deferrals are explicit.
- Commands and generated-source owners come from inspected docs.
Handoff
Return the plan location or chat body and whether /f-architecture is still required.
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 Changed · +12 lines · -4 tokens per session f573ffe8f777
- 4d ago First seen · 16 lines · 30 tokens per session scan A 611829c30ee5
plan-architecture is a skill published in the GitHub repository blockmatic/basilic (89 stars, last pushed yesterday), licensed MIT. It adds 26 tokens to every session and 278 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 2026-09-03.
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