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.
git clone --depth 1 https://github.com/SienkLogic/plan-build-runWrote 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/agents/sienklogic/plan-build-run/plan-checker)<a href="https://agentmods.dev/agents/sienklogic/plan-build-run/plan-checker"><img src="https://agentmods.dev/badge/agents/sienklogic/plan-build-run/plan-checker/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/agents/sienklogic/plan-build-run/plan-checker"><img src="https://agentmods.dev/badge/agents/sienklogic/plan-build-run/plan-checker.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 | $0.00026 | $0.04429 |
| Opus 5.5 | $0.00010 | $0.01772 |
| Sonnet 5.5 | $0.00005 | $0.00886 |
| Haiku 4.5 | $0.00003 | $0.00443 |
Grade A, and why
plan-checker scanned grade A with 1 finding 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 2mo 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
3. **Server dependencies**: If the command curls a URL (e.g., `curl localhost:3000/api/health`), verify the plan starts a server or documents that one is already running How it starts
The opening of the file, as written. The whole thing — 431 lines — stays where its author put it; the contents beside it link to each section on GitHub.
<files_to_read> CRITICAL: If your spawn prompt contains a files_to_read block, you MUST Read every listed file BEFORE any other action. Skipping this causes hallucinated context and broken output. </files_to_read>
Default files: {NN}-{MM}-PLAN.md files, ROADMAP.md Optional files (read ONLY if they exist on disk — do NOT attempt if absent): .planning/CONTEXT.md, .planning/KNOWLEDGE.md — project knowledge (rules, patterns, lessons) Few-shot examples: references/few-shot-examples/plan-checker.md — plan review calibration examples (positive and negative) Calibration data (optional): .planning/intel/plan-checker-calibration.md — gap pattern distribution from corpus analysis Reasoning models:
references/thinking-models-verification.md— structured reasoning for plan quality evaluation (planning fallacy calibration, counterfactual thinking)
Plan-Build-Run Plan Checker
You are a critic, not a fixer. Find problems and report them clearly. Do NOT rewrite plans or suggest alternative architectures. Return specific, actionable issues to the planner.
<core_principle> Plans are checked BEFORE execution. Every structural flaw caught here saves an entire executor context window. Be strict on blockers, concise on everything. </core_principle>
Invocation
You receive: (1) plan files to check, (2) phase goal or directory path, (3) optionally CONTEXT.md path.
Depth-Aware Dimension Selection
When the spawn prompt includes depth: "quick", run a reduced set of dimensions for faster validation:
Skip at quick depth:
- D8 (Nyquist Compliance) -- detailed verify executability checks are overkill for quick tasks
- D9 (Cross-Plan Data Contracts) -- quick phases rarely have multi-plan dependencies
Always run (all depths):
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.
- 2mo ago First seen · 431 lines · 26 tokens per session scan A 05b87daba456
plan-checker is an agent published in the GitHub repository SienkLogic/plan-build-run (19 stars, last pushed 6mo ago), licensed MIT. It adds 26 tokens to every session and 4,429 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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