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 sanghyun-io/plan-subdivider --skill plan-subdividegit clone --depth 1 https://github.com/sanghyun-io/plan-subdividerWrote 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/sanghyun-io/plan-subdivider/plan-subdivide)<a href="https://agentmods.dev/skills/sanghyun-io/plan-subdivider/plan-subdivide"><img src="https://agentmods.dev/badge/skills/sanghyun-io/plan-subdivider/plan-subdivide/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/skills/sanghyun-io/plan-subdivider/plan-subdivide"><img src="https://agentmods.dev/badge/skills/sanghyun-io/plan-subdivider/plan-subdivide.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 | $0.00023 | $0.02551 |
| Opus 5 | $0.00012 | $0.01275 |
| Sonnet 5 | $0.00005 | $0.00510 |
| Haiku 4.5 | $0.00002 | $0.00255 |
Grade A, and why
subdivide 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 407 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Plan Subdivide Skill
A skill that breaks down an existing plan file into detailed task files.
⚠️ Plan Mode Check (Top Priority)
IMPORTANT: If you are in Plan mode, exit it first before running this skill.
Behavior When Plan Mode is Detected
- Run ExitPlanMode: Exit Plan mode first
- Then run
/subdividenormally: Proceed from Step 1 after exiting
Why Is Exiting Plan Mode Necessary?
- In Plan mode, file creation (Write) is interpreted as a plan file
- During plan analysis, the system attempts to write a new plan
- After exiting Plan mode, subdivision work can proceed normally
Usage
/subdivide # Subdivide the most recent plan file
/subdivide ~/.claude/plans/my-plan.md # Subdivide a specific plan file
Execution Steps
Step 0: Exit Plan Mode
- Check if currently in Plan mode
- If in Plan mode, run
ExitPlanModeto exit - After exiting, proceed to Step 1
Step 1: Locate Plan File
- If a path is provided as an argument, use that file
- Search the current conversation context for the Plan file:
- If the context contains Plan content (plan title, file path, etc.), use that file
- If immediately after ExitPlanMode, prioritize the plan file just created
- If the Plan filename cannot be extracted from context, proceed to next step
- If neither of the above applies, select the most recently modified
.mdfile from~/.claude/plans/ - If the plan is already subdivided (folder exists), warn and request confirmation
Step 2: Analyze Plan
Read the plan file and extract:
- Overall objective: The main purpose of the plan
- Task list: Tasks to be performed
- Dependencies: Order/dependencies between tasks
- Reference sections: Section numbers in the original plan
Analysis criteria (Rules reference: @~/.claude/rules/plan-structure.md):
- Separate by independent deliverable units
- Consider logical ordering
- Compose into verifiable units
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.
- 8d ago First seen · 407 lines · 23 tokens per session scan A aab7e3647044
subdivide is a skill published in the GitHub repository sanghyun-io/plan-subdivider (2 stars, last pushed 6mo ago), licensed MIT. It adds 23 tokens to every session and 2,551 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 2026-08-31.
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