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 skills/yarlson/yarstack/plan-updatenpx skills add yarlson/yarstack --skill plan-updategit clone --depth 1 https://github.com/yarlson/yarstackWhat 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 | $0.00036 | $0.00293 |
| Opus 5 | $0.00018 | $0.00147 |
| Sonnet 5 | $0.00007 | $0.00059 |
| Haiku 4.5 | $0.00004 | $0.00029 |
Grade A, and why
plan-update 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
Plan Update
Correct an implementation plan without making product, architecture, or behavior decisions.
Workflow
- Identify the authoritative plan, exact mechanical defect, evidence, and affected phases.
- Confirm that the correction is local. Use
plan-createwhen multiple phases require broad replanning. - Use
spec-updatewhen the defect concerns product behavior, architecture semantics, a public contract, or acceptance meaning. Usearchitecture-refinewhen runtime architecture remains unsettled. - For plans affecting long-running or distributed workloads, verify established guarantees cover restarts, rolling replacement, concurrent replicas, in-flight or duplicate work, partial failure, and recovery. Repair omissions only when repository evidence or a settled contract determines the behavior.
- Stop for user direction when the correction materially expands authorized scope.
- Apply the smallest correction in the plan's existing structure and style.
- Verify affected dependencies, cross-references, invariants, environmental and failure assumptions, acceptance evidence, and downstream phases remain consistent.
Do not use plans as progress logs, add speculative roadmap work, rewrite unrelated phases, or disguise scope expansion as maintenance.
Finish by reporting the defect, evidence, exact correction, affected phases, and whether implementation or validation can safely resume.
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 First seen · 23 lines · 36 tokens per session scan A c4bbb5c4b9da
plan-update is a skill published in the GitHub repository yarlson/yarstack (3 stars, last pushed 4d ago), licensed MIT. It adds 36 tokens to every session and 293 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 2026-08-31.
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