task-executor

task-executor is a skill for Claude Code, Codex from nguyenvanphituoc/shapeup-sdlc-plugin. It costs 111 tokens per session (3,193 once invoked), scanned A, original, MIT.

An execution worker for a planner–implementer–reviewer workflow that carries out software tasks from a written work order.

In plain words
What is it for?
Reading assigned task specifications, changing only permitted files, implementing acceptance criteria, verifying the result, and reporting the work.
Why use it?
It keeps implementation tied to the stated requirements, allowed files, decisions, and acceptance checks instead of relying on unstated assumptions.

Skill for Claude CodeCodex

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the shapeup-sdlc-plugin plugin — 17 skills, 11 commands, 4 hooks shipped together

Install

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.

agentmods
npx agentmods add skills/nguyenvanphituoc/shapeup-sdlc-plugin/task-executor
Any agent
npx skills add nguyenvanphituoc/shapeup-sdlc-plugin --skill task-executor
Clone the repo
git clone --depth 1 https://github.com/nguyenvanphituoc/shapeup-sdlc-plugin

Made for: Claude Code, Codex.

Or install shapeup-sdlc-plugin, the plugin that ships this one along with the rest of its 17 skills, 11 commands, 4 hooks.

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 task-executor

README.md
[![agentmods](https://agentmods.dev/badge/skills/nguyenvanphituoc/shapeup-sdlc-plugin/task-executor.svg)](https://agentmods.dev/skills/nguyenvanphituoc/shapeup-sdlc-plugin/task-executor)
Your own site
<a href="https://agentmods.dev/skills/nguyenvanphituoc/shapeup-sdlc-plugin/task-executor"><img src="https://agentmods.dev/badge/skills/nguyenvanphituoc/shapeup-sdlc-plugin/task-executor.svg" alt="Measured on agentmods" height="20"></a>
Per session 111 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,193 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00111 $0.03193
Opus 5 $0.00056 $0.01597
Sonnet 5 $0.00022 $0.00639
Haiku 4.5 $0.00011 $0.00319

Measured 3d ago against content hash 9c8343153590, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

task-executor 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 3d 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.

skills/task-executor/SKILL.md · 209 lines

How it starts

The opening of the file, as written. The whole thing — 209 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Task Executor (pure worker, v2.0)

Implement exactly what the acceptance criteria specify. Prove it. Report it.

You are the doer in a planner → doer → judge harness. Your entire interface with the pipeline is two JSON envelopes: a WorkOrder in, a WorkResult out. You know nothing about boards, ledgers, run-state, rounds, or other workers — if the order doesn't carry it, it does not exist for you.


Input contract — the WorkOrder

You are invoked as --order <path> pointing at a schema-valid WorkOrder. Fields you may rely on (anything absent = unknown; never invent it):

Field What it is
payload.tasks[] The task(s) to implement: id, body_path (read it fully), acceptance_criteria[]
payload.scope_contract The active scope: affordance_manifest, e2e_verification_fixtures, topology
substrate.allowed / substrate.shared The ONLY globs you may write. A needed file outside them → ESCALATE, never a write (a sandbox hook blocks it anyway)
payload.decisions[] Adjudicated answers from prior escalations — binding precedent, apply them
payload.digested_errors[] {file, line, core_message} triples from the previous attempt's failed verification — your starting bug list
payload.trial_history[] Up to 8 prior attempts on this scope, oldest first, CROSSING the round boundary: {score, status, delta, digest}. status: "reverted" is a change that was tried and made things WORSE — do not re-propose it. status: "kept" with a still-red score is the tree you are building ON, not a failure to undo. Absent on the first attempt
payload.verify.test_cmd The command that verifies your work. No test_cmd → command-verifiable ACs still need some observable check; say what you used
payload.kb_rules_path Team guidelines (read if the file exists) — steering, never spec; conflict → the AC wins, note it in deviations
payload.constraints Non-Go items and freezes (e.g. ui_layers.layer3_frozen)
payload.bugs[] The previous round's FAIL verdict, addressed to files inside YOUR substrate: {severity, criterion, location, repro, expected, actual}. Fix exactly these and touch nothing else. They are spec-conformance defects, so verification is ALREADY green and will stay green whether or not you fix them — a passing test_cmd is not evidence you are done this round, and re-running it cannot tell you. Read the cited lines against the committed spec instead. An entry marked unowned cites a file no scope owns: fix it only if it falls inside your substrate. Absent unless the previous round failed
operation execute (fresh), fix (only the bugs in payload.bugs — touch nothing else), spike (produce a decision doc, not code). A build round whose predecessor returned FAIL arrives as fix with the same substrate as the execute that preceded it

Read the full file on GitHub · 209 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. 3d ago First seen · 209 lines · 111 tokens per session scan A 9c8343153590

Subscribe to this mod's changes

task-executor is a skill published in the GitHub repository nguyenvanphituoc/shapeup-sdlc-plugin (2 stars, last pushed 13d ago), licensed MIT. It adds 111 tokens to every session and 3,193 once invoked, about $0.0006 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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