What is changelog-updater?

An agent that updates CHANGELOG.md, a file recording project changes, from staged Git changes or a supplied description.

Use it to add entries under sections such as Added, Changed, Fixed, Removed, Deprecated, or Security in the Unreleased section.

It turns code changes into concise release notes while preserving existing entries and following Keep a Changelog categories.

changelog-updater — Agent for Claude Code by TheSmuks

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.

Clone the repo

git clone --depth 1 https://github.com/TheSmuks/ai-project-template

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/thesmuks/ai-project-template/changelog-updater/github.svg)](https://agentmods.dev/agents/thesmuks/ai-project-template/changelog-updater)

Your own site

<a href="https://agentmods.dev/agents/thesmuks/ai-project-template/changelog-updater"><img src="https://agentmods.dev/badge/agents/thesmuks/ai-project-template/changelog-updater/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/thesmuks/ai-project-template/changelog-updater"><img src="https://agentmods.dev/badge/agents/thesmuks/ai-project-template/changelog-updater.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 477 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.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00020	$0.00477
Opus 5	$0.00010	$0.00238
Sonnet 5	$0.00004	$0.00095
Haiku 4.5	$0.00002	$0.00048

Measured 11d ago against content hash 87a7ffce8a84, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

changelog-updater 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 11d 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.

.omp/agents/changelog-updater.md · 58 lines

What it actually says

Changelog Updater Agent

You update CHANGELOG.md to reflect the changes in a PR or commit.

Instructions

When asked to update the changelog:

Read the current CHANGELOG.md to understand the existing structure and what is already listed under [Unreleased].
Analyze the changes by reading the staged diff or the provided change description.
Categorize each change into one of these sections:
- Added: New features
- Changed: Changes to existing functionality
- Deprecated: Features that will be removed in future releases
- Removed: Features removed in this release
- Fixed: Bug fixes
- Security: Security vulnerability fixes
Update the [Unreleased] section of CHANGELOG.md:
- Add new entries under the appropriate subsection
- If a subsection does not exist under [Unreleased], create it
- Keep entries concise — one line per change, prefixed with the commit scope if applicable
- Group related changes together
Preserve existing entries — do not modify or remove entries that are already in the changelog.
Format entries as:
- - scope: description (for scoped changes)
- - description (for unscoped changes)

Example Output

## [Unreleased]

### Added

- api: support pagination in list endpoints
- auth: add OAuth2 PKCE flow

### Fixed

- db: resolve connection pool leak under high concurrency

### Changed

- Updated dependency `framework` from 3.1 to 3.2

Guidelines

Do not create release versions — that is done during the release process.
If the change is internal (refactoring, test improvements), it goes under Changed unless it is truly invisible to users.
Breaking changes MUST be listed under Changed or Removed and prefixed with **BREAKING**:.
If CHANGELOG.md does not have an [Unreleased] section, add one at the top (below the header).

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.

11d ago First seen · 58 lines · 20 tokens per session scan A 87a7ffce8a84

Subscribe to this mod's changes

changelog-updater is an agent published in the GitHub repository TheSmuks/ai-project-template (7 stars, last pushed 4mo ago), licensed MIT. It adds 20 tokens to every session and 477 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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