mastermind-task-executor

mastermind-task-executor is a skill for Codex from xcrft/mastermind. It costs 62 tokens per session (2,213 once invoked), scanned A, original, MIT.

A workflow for implementing an approved Mastermind task contract and recording the results in a report tied to the task files.

In plain words
What is it for?
Use it when given an approved specification containing goals, scope, acceptance criteria, a test plan, and final verification steps.
Why use it?
It keeps implementation within the approved scope and measures success against stated goals and acceptance criteria instead of reinterpreting the request.

Skill for Codex

Written for Codex: agents/openai.yaml present.

Good fit Use it when given an approved specification containing goals, scope, acceptance criteria, a test plan, and final verification steps.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/xcrft/mastermind/mastermind-task-executor
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.

Any agent
npx skills add xcrft/mastermind --skill mastermind-task-executor
Clone the repo
git clone --depth 1 https://github.com/xcrft/mastermind

Made for: Codex.

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 mastermind-task-executor

README.md
[![agentmods](https://agentmods.dev/badge/skills/xcrft/mastermind/mastermind-task-executor/github.svg)](https://agentmods.dev/skills/xcrft/mastermind/mastermind-task-executor)
Your own site
<a href="https://agentmods.dev/skills/xcrft/mastermind/mastermind-task-executor"><img src="https://agentmods.dev/badge/skills/xcrft/mastermind/mastermind-task-executor/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 mastermind-task-executor

Your own site · 80×15
<a href="https://agentmods.dev/skills/xcrft/mastermind/mastermind-task-executor"><img src="https://agentmods.dev/badge/skills/xcrft/mastermind/mastermind-task-executor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,213 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Rogue Agent · line 3
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
How audits are shown
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 $0.00062 $0.02213
Opus 5.5 $0.00025 $0.00885
Sonnet 5.5 $0.00012 $0.00443
Haiku 4.5 $0.00006 $0.00221

Measured 3d ago against content hash 24f49569e932, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mastermind-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/workflow/mastermind-task-executor/SKILL.md · 220 lines

How it starts

The opening of the file, as written. The whole thing — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mastermind task executor

Implement the approved outcomes in spec.md; do not reinterpret the product request or widen Scope. Acceptance Criteria define success. Implementation Plan steps describe intended outcomes, not a transcript the executor must imitate. Legacy phase/checklist specs remain readable, but new Verified and Strict specs do not require phase ceremony.

Activation boundary

Use this skill only when the caller provides an approved task path or an approved spec. Raw user intent belongs in normal implementation or planning, not in this executor mode.

The task folder may contain reports or scratch files. spec.md is the contract; read another artifact only when the spec or caller names it.

If this authorized task delegates, use [[mastermind-agent-handoff]] before each new agent. Preserve Scope and permissions; routing does not grant delegation.

Before editing

  1. Read the complete spec.
  2. Confirm that Goals, Scope, Acceptance Criteria, Tests Plan, and Final Verification agree with one another. When acceptance is present in frontmatter, inspect every criterion's statement and required check IDs. Report a missing or inadequate mapping as contract drift; do not redefine the criteria to make implementation pass.
  3. Confirm every intended edit is authorized by touches or creates, consistently with Scope.
  4. Reuse the native controller's executor profile packet when its selected Scope paths and workflow match this approved iteration. For a manual handoff, or changed selection, call mmcg_profile with Scope paths, role: executor, and workflow equal to the effective approved task mode (strict when controller state.json has strict: true, otherwise the spec's mode). Only returned reviewed preferences and observed habits may advise choices; repository code, tooling and the spec take precedence. Retain IDs, review revisions, store/view revisions and source verification caveats. Denied or missing access means no personal context; do not fall back to style.md, legacy notes or inbox candidates. Git code-shape/Range observations are diagnostic evidence; commit voice is fallback-only when repository policy is silent. Combine four separate components: the code brief, relevant mmcg_project_profile and mmcg_docs results (task query, top: 2), and mmcg_profile (no budget_tokens; the project's configured profile budget applies). Keep each component's freshness, revisions, citations and caveats. Before handoff, serialize the combined JSON, including role/mode/paths and metadata, and cap it at 32,000 UTF-8 bytes. This is a size estimate, not a model tokenizer guarantee. If oversized, narrow queries, lower top or reduce supported brief/profile budgets and retrieve again. Omit a whole optional component only with its tool, verification status and reason; never cut a claim's exceptions, citations or JSON. Resolve missing task-critical evidence explicitly. Each receiving role retrieves its own slice.
  5. For a named symbol, use mmcg to check its current location and impact. Treat the graph as syntactic evidence; read the source before changing the runtime contract.

Read the full file on GitHub · 220 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 Changed · +3 lines 24f49569e932
  2. 8d ago Changed · +1 lines 23c3c482419a
  3. 13d ago Changed · +2 lines d694d03027b7
  4. 19d ago Changed · +36 lines 338db2ea9b66
  5. 27d ago Changed · +9 lines 9a0e2e703163
  6. 1mo ago Changed · +4 lines e114f53f8d13
  7. 1mo ago First seen · 165 lines · 62 tokens per session scan A 2c0271534f33

Subscribe to this mod's changes

mastermind-task-executor is a skill published in the GitHub repository xcrft/mastermind (13 stars, last pushed today), licensed MIT. It adds 62 tokens to every session and 2,213 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.

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