changelog-manager

changelog-manager is a skill for Claude Code, Codex from armanzeroeight/fastagent-plugins. It costs 36 tokens per session (972 once invoked), scanned A, original, MIT.

A skill for maintaining changelogs in Keep a Changelog format, a common structure for recording software releases and changes.

In plain words
What is it for?
Reviewing changes, categorizing additions, fixes, removals, and other updates, and adding formatted entries to a CHANGELOG file.
Why use it?
It turns commit history and version information into consistently grouped release notes.

Skill for Claude CodeCodex

Part of the documentation-toolkit plugin — 3 skills 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/armanzeroeight/fastagent-plugins/changelog-manager
Any agent
npx skills add armanzeroeight/fastagent-plugins --skill changelog-manager
Clone the repo
git clone --depth 1 https://github.com/armanzeroeight/fastagent-plugins

Made for: Claude Code, Codex.

Or install documentation-toolkit, the plugin that ships this one along with the rest of its 3 skills.

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 changelog-manager

README.md
[![agentmods](https://agentmods.dev/badge/skills/armanzeroeight/fastagent-plugins/changelog-manager.svg)](https://agentmods.dev/skills/armanzeroeight/fastagent-plugins/changelog-manager)
Your own site
<a href="https://agentmods.dev/skills/armanzeroeight/fastagent-plugins/changelog-manager"><img src="https://agentmods.dev/badge/skills/armanzeroeight/fastagent-plugins/changelog-manager.svg" alt="Measured on agentmods" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 972 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 5.1 $0.00036 $0.00972
Opus 5 $0.00018 $0.00486
Sonnet 5 $0.00007 $0.00194
Haiku 4.5 $0.00004 $0.00097

Measured 5d ago against content hash 35d13932120d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

changelog-manager 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 5d 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.

plugins/documentation-toolkit/skills/changelog-manager/SKILL.md · 194 lines

How it starts

The opening of the file, as written. The whole thing — 194 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Changelog Manager

Quick Start

Create or update a changelog:

# Review recent commits
git log --oneline --since="2024-01-01"

# Check current version
cat package.json | grep version

Instructions

Step 1: Review Changes

Gather changes since last release:

# Get commits since last tag
git log $(git describe --tags --abbrev=0)..HEAD --oneline

# Or since specific date
git log --since="2024-01-01" --pretty=format:"%s"

Step 2: Categorize Changes

Group by type following Keep a Changelog:

Category Description Examples
Added New features New API endpoint, new command
Changed Changes to existing Updated algorithm, changed default
Deprecated Soon-to-be removed Old API marked deprecated
Removed Removed features Deleted unused function
Fixed Bug fixes Fixed crash, corrected calculation
Security Security fixes Patched vulnerability

Step 3: Format Entry

Follow Keep a Changelog format:

## [Version] - YYYY-MM-DD

### Added
- New feature description
- Another new feature

### Changed
- Modified behavior description

### Fixed
- Bug fix description

Step 4: Update CHANGELOG.md

Add new entry at the top (after "Unreleased"):

# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]

## [2.1.0] - 2024-01-15

### Added
- User authentication with JWT tokens
- Rate limiting for API endpoints

### Changed
- Updated database schema for better performance
- Improved error messages

### Fixed
- Fixed memory leak in background worker
- Corrected timezone handling in reports

## [2.0.0] - 2023-12-01

### Added
- Complete API rewrite
- GraphQL support

### Changed
- **BREAKING**: New authentication system

### Removed
- Legacy v1 API endpoints

Read the full file on GitHub · 194 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. 5d ago First seen · 194 lines · 36 tokens per session scan A 35d13932120d

Subscribe to this mod's changes

changelog-manager is a skill published in the GitHub repository armanzeroeight/fastagent-plugins (29 stars, last pushed 1mo ago), licensed MIT. It adds 36 tokens to every session and 972 once invoked, about $0.0002 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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