plan

A Hardproof planning skill for turning an approved software design into ordered implementation tasks. Each task includes dependencies, likely files, risks, and an acceptance check.

In plain words
What is it for?
Use it during the PLAN stage to create the task sequence and records needed before implementation begins.
Why use it?
It makes the work executable and reviewable, so required outcomes are covered and tasks can be verified independently.

Skill for Claude CodeCodex

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/asimons81/hardproof/plan
Any agent
npx skills add asimons81/hardproof --skill plan
Clone the repo
git clone --depth 1 https://github.com/asimons81/hardproof

Made for: Claude Code, Codex.

Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 280 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 $0.00023 $0.00280
Opus 5 $0.00012 $0.00140
Sonnet 5 $0.00005 $0.00056
Haiku 4.5 $0.00002 $0.00028

Measured 2d ago against content hash 06e76242f06c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

plan 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.

hardproof/skills/plan/SKILL.md · 35 lines

What it actually says

Plan the Implementation

Purpose

Create an executable task sequence that preserves the approved design and makes progress inspectable.

When to use

Use for the PLAN stage selected by the active run context.

Inputs

Read the design, design approval, repository conventions, affected files, tests, migrations, documentation, and risk profile.

Procedure

  1. Decompose work into coherent tasks with observable outcomes.
  2. Name dependencies, likely files, risk, and acceptance checks.
  3. Include documentation and migration work with the behavior they describe.
  4. Add each task through hardproof_task.
  5. Record the complete plan through hardproof_record.

Required records

Standard and Critical runs require a plan artifact, durable task records, and a separate human plan approval.

Exit criteria

Every required outcome maps to a task, dependencies are acyclic, and each task can be verified without relying on confidence.

Failure modes

Return to DESIGN if planning exposes a contract flaw. Do not create vague tasks, omit release work, or grant approval through a model tool.

Verification

Check task coverage and dependency order, then ask the human to use /hardproof approve plan. After approval exists, call hardproof_transition for IMPLEMENT.

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. 2d ago First seen · 35 lines · 23 tokens per session scan A 06e76242f06c

Subscribe to this mod's changes

plan is a skill published in the GitHub repository asimons81/hardproof (5 stars, last pushed 3d ago), licensed Apache-2.0. It adds 23 tokens to every session and 280 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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