check-changed-folders

check-changed-folders is a skill for Claude Code, Codex from RudderCode/Rudder. It costs 102 tokens per session (1,108 once invoked), scanned A, original, Apache-2.0.

A branch-checking workflow for Rudder, a software project with a core package and a plugin workspace. It compares the current branch with the main branch and runs the relevant type checks, tests, and builds.

In plain words
What is it for?
Validating changed code before a commit or pull request, checking Claude and Codex provider parity, confirming the shared agent-instruction layout, and verifying agent attribution.
Why use it?
It brings several pre-commit checks into one review and reports failures that could otherwise be found only later in code review or continuous integration.

Skill for Claude CodeCodex

Part of the rudder plugin — 6 skills, 2 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/ruddercode/rudder/check-changed-folders
Any agent
npx skills add RudderCode/Rudder --skill check-changed-folders
Clone the repo
git clone --depth 1 https://github.com/RudderCode/Rudder

Made for: Claude Code, Codex.

Or install rudder, the plugin that ships this one along with the rest of its 6 skills, 2 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 check-changed-folders

README.md
[![agentmods](https://agentmods.dev/badge/skills/ruddercode/rudder/check-changed-folders.svg)](https://agentmods.dev/skills/ruddercode/rudder/check-changed-folders)
Your own site
<a href="https://agentmods.dev/skills/ruddercode/rudder/check-changed-folders"><img src="https://agentmods.dev/badge/skills/ruddercode/rudder/check-changed-folders.svg" alt="Measured on agentmods" height="20"></a>
Per session 102 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,108 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 $0.00102 $0.01108
Opus 5 $0.00051 $0.00554
Sonnet 5 $0.00020 $0.00222
Haiku 4.5 $0.00010 $0.00111

Measured 4d ago against content hash 3f4fd015c111, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

check-changed-folders 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 4d 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.

.agents/skills/check-changed-folders/SKILL.md · 84 lines

How it starts

The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Check Changed Folders

Identify what changed on the branch, verify provider parity, the centralized agent-instruction layout, and agent attribution, run the package checks, and report pass/fail status with actionable failure output. The root npm scripts validate the core package and the Rudder plugin workspace. Checks are therefore repo-wide rather than per-package.

Workflow

  1. Identify changed files against main, including local staged/unstaged changes:
git fetch origin main
git diff --name-only origin/main...HEAD
git diff --name-only
git diff --name-only --cached

If anything under src/, bin/, test/, ui/, .claude-plugin/, .codex-plugin/, hooks/, skills/, or a build/config file (package.json, tsconfig*.json, .mcp.json, .github/) changed, the package checks below apply.

  1. Verify the centralized agent-instruction layout before running checks:
  • AGENTS.md is the canonical repository guidance.
  • .agents/skills/ is the only reusable-workflow source. Do not add command aliases or edit tool-specific symlinks.
  • Ensure that every skill has a corresponding skills/<skill-name>/agents/openai.yaml detailing its Codex display name, short description, and default prompt.
  • Confirm the compatibility links resolve correctly:
    • .claude/skills -> ../.agents/skills
    • .codex/skills -> ../.agents/skills
  • If any link is missing or resolves outside .agents/, mark the check as failed and report the broken path.
  1. Verify provider parity.
  • Treat Claude and Codex as supported providers for the same Rudder plugin package.
  • When a change adds, removes, or modifies a provider-facing component—manifest metadata, skills, hooks, MCP servers, apps, UI, or packaged artifacts—inspect both provider manifests and runtime paths.
  • Require equivalent discovery, launch behavior, packaged resources, and user-facing capability across providers. Provider-specific schema or environment-variable differences are allowed, but they must remain explicit implementation details rather than functional gaps.
  • Add or update a regression assertion in test/plugin-package.test.ts or the relevant runtime test that exercises both provider paths. If provider-facing behavior changes without parity coverage, fail this check.
  • Permit a provider-specific exception only when the user explicitly requests it or the provider cannot support the capability. Report the reason, the affected provider, and the test that protects the supported behavior.

Read the full file on GitHub · 84 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. 4d ago First seen · 84 lines · 102 tokens per session scan A 3f4fd015c111

Subscribe to this mod's changes

check-changed-folders is a skill published in the GitHub repository RudderCode/Rudder (23 stars, last pushed today), licensed Apache-2.0. It adds 102 tokens to every session and 1,108 once invoked, about $0.0005 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 2026-08-30.

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