update-changelog

update-changelog is a skill for Claude Code from eveld/claude. It costs 17 tokens per session (665 once invoked), scanned A, original, MIT.

A procedure for recording implementation progress and final results in a project's changelog.md file. It records what was completed, changed, discovered, and left for later.

In plain words
What is it for?
Use it after implementation phases and at project completion to document changes, deviations, discoveries, lessons, and technical debt.
Why use it?
It prevents project history from losing the difference between the original plan and the work actually completed.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the workflows plugin — 29 skills, 5 commands, 17 agents shipped together

Good fit Use it after implementation phases and at project completion to document changes, deviations, discoveries, lessons, and technical debt.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/eveld/claude/update-changelog
View source ↗ eveld/claude
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.

Any agent
npx skills add eveld/claude --skill update-changelog
Clone the repo
git clone --depth 1 https://github.com/eveld/claude

Made for: Claude Code.

Or install workflows, the plugin that ships this one along with the rest of its 29 skills, 5 commands, 17 agents.

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 update-changelog

README.md
[![agentmods](https://agentmods.dev/badge/skills/eveld/claude/update-changelog/github.svg)](https://agentmods.dev/skills/eveld/claude/update-changelog)
Your own site
<a href="https://agentmods.dev/skills/eveld/claude/update-changelog"><img src="https://agentmods.dev/badge/skills/eveld/claude/update-changelog/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.

agentmods 80×15 button for update-changelog

Your own site · 80×15
<a href="https://agentmods.dev/skills/eveld/claude/update-changelog"><img src="https://agentmods.dev/badge/skills/eveld/claude/update-changelog.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 665 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00017 $0.00665
Opus 5 $0.00009 $0.00332
Sonnet 5 $0.00003 $0.00133
Haiku 4.5 $0.00002 $0.00067

Measured 9d ago against content hash a298c3b0c6f3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

update-changelog 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 9d 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.

skills/update-changelog/SKILL.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Update Changelog

Append phase tracking or final summary to thoughts/NNNN-description/changelog.md.

When to Use

During Implementation (after each phase):

  • Document what was actually done vs planned
  • Note deviations and reasons
  • List files changed
  • Capture discoveries

At Completion (after all phases):

  • Append FINAL SUMMARY section
  • Summarize key deviations
  • Document lessons learned
  • Note technical debt and follow-up work

Phase Update Format

Use template from templates/changelog-document.md Phase section:

## Phase {N}: {Phase Name}
**Completed**: {ISO_DATE}
**Status**: ✅ Complete

### What We Did
- Created slug determination skill
- Added interactive prompting with suggestions

### Deviations from Plan
- **Planned**: Create bash script only
- **Actually**: Created both skill and script
- **Reason**: Skill needed for integration with commands

### Files Changed
- `skills/determine-feature-slug/SKILL.md` - New skill file
- `scripts/next-feature-slug.sh` - Helper script

### Discoveries
- Bash parameter expansion handles leading zeros: `10#$NUM`
- Kebab-case validation regex: `^[a-z0-9-]+$`

Final Summary Format

Use template from templates/changelog-document.md FINAL SUMMARY section:

## 🎯 FINAL SUMMARY
**Completion Date**: 2026-02-05
**Overall Status**: ✅ Complete

### What Was Built
Full plugin restructuring with feature directories, changelog tracking,
milestone grouping, and agent orchestration.

### Key Deviations
1. Added interactive slug prompting (not in original plan)
2. Kept thoughts/notes/ unchanged instead of moving

### Impact on Original Plan
- Plan estimated 11 phases, completed 11
- Added 2 skills not in plan (prompting helpers)
- Simplified 3 phases by combining related changes

[... rest of sections ...]

Important Guidelines

  • Read plan first to understand what was intended
  • Compare actual vs planned - be specific about deviations
  • Capture learnings - what would you do differently?
  • Note technical debt - what was compromised for speed?
  • Append only - never modify previous phase entries
  • Be concise - focus on what matters, skip obvious details

Read the full file on GitHub · 101 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. 9d ago First seen · 101 lines · 17 tokens per session scan A a298c3b0c6f3

Subscribe to this mod's changes

update-changelog is a skill published in the GitHub repository eveld/claude (10 stars, last pushed 7mo ago), licensed MIT. It adds 17 tokens to every session and 665 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.