plan-change

A planning step for designing one classified CloudX code change before implementation begins.

In plain words
What is it for?
It produces a typed plan containing the task and commit details, affected areas, risk, analogous code locations, expected behavior, negative cases, allowed paths, and exact verification commands.
Why use it?
It ties the proposed work to the current source, repository rules, ownership boundaries, and tests instead of relying on guesses. It also defines what must be checked and which files may or may not change.

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

Made for: Claude Code, Codex.

Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 332 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 $0.00019 $0.00332
Opus 5 $0.00010 $0.00166
Sonnet 5 $0.00004 $0.00066
Haiku 4.5 $0.00002 $0.00033

Measured yesterday against content hash c773f8993495, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

plan-change 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 yesterday.

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.

.agents/skills/plan-change/SKILL.md · 44 lines

What it actually says

Plan Change

Responsibility

Design the change at the correct owner and define proof before code is written. Do not edit code, review the plan, or mutate GitHub.

Inputs

  • Original task, base/head SHA, and policy digest.
  • Classification from .agents/pr-review-policy.toml.
  • Root and all applicable scoped AGENTS.md files.
  • Policy-selected area skills and current source/tests.

Run in a fresh context. Research the current code and read every proposed file. Trace at least two analogous repository implementations.

Required Plan

Produce JSON that validates against .agents/schemas/plan.schema.json with:

  • exact task, SHAs, policy digest, and selected skill digests;
  • type, areas, risk, skills, human-review requirement and automerge eligibility;
  • at least two path/line anchors and why each is analogous;
  • behavioral claims with owner/seam, production-path test, and negative cases;
  • explicit allowed and forbidden paths;
  • exact verification commands from docs/architecture/testing-map.md.

Place behavior at the owner in docs/architecture/module-ownership.md. Account for every affected invariant in docs/architecture/state-invariants.md. If the task requires a compatibility layer, record the break and stop for explicit user approval before planning compatibility.

Stop Conditions

Return a blocking gap instead of guessing when ownership, behavior, external requirements, or a safe proof strategy is unresolved. Scope outside allowed paths requires a new complete plan.

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. yesterday First seen · 44 lines · 19 tokens per session scan A c773f8993495

Subscribe to this mod's changes

plan-change is a skill published in the GitHub repository davidomil/cloudx (1 stars, last pushed 9d ago), licensed MIT. It adds 19 tokens to every session and 332 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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