exec

exec is a skill for Claude Code from umputun/cc-thingz. It costs 41 tokens per session (7,540 once invoked), scanned A, original, MIT.

A command that carries out an implementation plan one task at a time using separate coding agents.

In plain words
What is it for?
Use it when the user asks to execute a plan file or implement its tasks sequentially.
Why use it?
It provides an organised way to work through a plan while keeping each task isolated.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions subagents.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the planning plugin — 1 skill, 1 command, 1 agent, 1 hook shipped together

Good fit Use it when the user asks to execute a plan file or implement its tasks sequentially.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add umputun/cc-thingz
Claude Code
/plugin install planning

Made for: Claude Code.

Or install planning, the plugin that ships this one along with the rest of its 1 skill, 1 command, 1 agent, 1 hook.

Wrote 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.

agentmods badge for exec

README.md
[![agentmods](https://agentmods.dev/badge/skills/umputun/cc-thingz/exec/github.svg)](https://agentmods.dev/skills/umputun/cc-thingz/exec)
Your own site
<a href="https://agentmods.dev/skills/umputun/cc-thingz/exec"><img src="https://agentmods.dev/badge/skills/umputun/cc-thingz/exec/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.

agentmods 80×15 button for exec

Your own site · 80×15
<a href="https://agentmods.dev/skills/umputun/cc-thingz/exec"><img src="https://agentmods.dev/badge/skills/umputun/cc-thingz/exec.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,540 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00041 $0.07540
Opus 5.5 $0.00016 $0.03016
Sonnet 5.5 $0.00008 $0.01508
Haiku 4.5 $0.00004 $0.00754

Measured 1mo ago against content hash f1cfd7238fb7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

exec 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 1mo ago.

The scan reads SKILL.md. This mod also ships 11 executable files (scripts/append-progress.sh, scripts/create-branch.sh, scripts/customize-file.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

plugins/planning/skills/exec/SKILL.md · 307 lines

How it starts

The opening of the file, as written. The whole thing — 307 lines — stays where its author put it; the contents beside it link to each section on GitHub.

exec

Execute plan file tasks sequentially, each in an isolated subagent.

Arguments

  • $ARGUMENTS — path to plan file (optional; if omitted, ask user to pick from plans_dir userConfig directory, default: docs/plans/)

File Resolution

ALWAYS use the resolve script to read prompt and agent files. NEVER construct the override chain manually:

bash ${CLAUDE_PLUGIN_ROOT}/skills/exec/scripts/resolve-file.sh prompts/task.md ${CLAUDE_PLUGIN_DATA}
bash ${CLAUDE_PLUGIN_ROOT}/skills/exec/scripts/resolve-file.sh agents/quality.txt ${CLAUDE_PLUGIN_DATA}

The script checks project overrides, user overrides, and bundled defaults automatically.

Placeholder Substitution

After reading a prompt file, replace ALL placeholders with actual values before passing to a subagent. Subagents run in fresh contexts without plugin env vars.

Always substitute: PLAN_FILE_PATH, PROGRESS_FILE_PATH, DEFAULT_BRANCH, ${CLAUDE_PLUGIN_ROOT} (resolve to actual absolute path), RESOLVE_SCRIPT (absolute path to ${CLAUDE_PLUGIN_ROOT}/skills/exec/scripts/resolve-file.sh), PLUGIN_DATA_DIR (resolved ${CLAUDE_PLUGIN_DATA} path — passed as second argument to resolve-file.sh so it can find user overrides), USER_RULES (resolved custom rules content from the rules loading step, or empty string if no rules found), and phase-specific values (FINDINGS_LIST, REVIEW_PHASE, DIFF_COMMAND).

Custom Rules Loading

Before starting execution, run this command via Bash tool to check for user-provided custom rules:

bash ${CLAUDE_PLUGIN_ROOT}/scripts/resolve-rules.sh planning-rules.md ${CLAUDE_PLUGIN_DATA}

If the output is non-empty, store it as the resolved custom rules content. When substituting USER_RULES in task prompts, wrap the content with a label so the subagent understands it: use "ADDITIONAL CUSTOM RULES:\n" as the substitution. If the output is empty, substitute an empty string for USER_RULES. See ${CLAUDE_PLUGIN_ROOT}/references/custom-rules.md for full documentation on the rules mechanism.

Read the full file on GitHub · 307 lines

Changes

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.

  1. 1mo ago Changed f1cfd7238fb7
  2. 1mo ago First seen · 307 lines · 41 tokens per session scan A 62ca4eb287f7

Subscribe to this mod's changes

exec is a skill published in the GitHub repository umputun/cc-thingz (486 stars, last pushed 10d ago), licensed MIT. It adds 41 tokens to every session and 7,540 once invoked, about $0.0002 per session on Opus 5.5. 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.