changelog

changelog is a skill for Claude Code, OpenCode from TraftG/opencode-game-studio. It costs 29 tokens per session (1,104 once invoked), scanned A, original, MIT.

A changelog generator that turns Git commits, sprint reports, and design documents into internal and player-facing release notes. Git is the system used to record code changes over time.

In plain words
What is it for?
Use it to summarize changes for a version or sprint, including features, improvements, bug fixes, balance changes, and known issues.
Why use it?
It saves time when reconstructing what changed and presents the same release in a form suited to developers and players.

Skill for Claude CodeOpenCode

Written for Claude Code and OpenCode: allowed-tools in frontmatter, but also installed under .opencode/.

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/traftg/opencode-game-studio/changelog
Any agent
npx skills add TraftG/opencode-game-studio --skill changelog
Clone the repo
git clone --depth 1 https://github.com/TraftG/opencode-game-studio

Made for: Claude Code, OpenCode.

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

README.md
[![agentmods](https://agentmods.dev/badge/skills/traftg/opencode-game-studio/changelog.svg)](https://agentmods.dev/skills/traftg/opencode-game-studio/changelog)
Your own site
<a href="https://agentmods.dev/skills/traftg/opencode-game-studio/changelog"><img src="https://agentmods.dev/badge/skills/traftg/opencode-game-studio/changelog.svg" alt="Measured on agentmods" height="20"></a>
Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,104 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 $0.00029 $0.01104
Opus 5 $0.00015 $0.00552
Sonnet 5 $0.00006 $0.00221
Haiku 4.5 $0.00003 $0.00110

Measured 2d ago against content hash a6ac81374cdc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

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 2d 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.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

  • changelog — 100% identical, 0 lines differ
  • changelog — 100% identical, 0 lines differ
.opencode/skills/changelog/SKILL.md · 134 lines

How it starts

The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.

When this skill is invoked:

  1. Read the argument for the target version or sprint number. If a version is given, use the corresponding git tag. If a sprint number is given, use the sprint date range.

1b. Check git availability — Verify the repository is initialized:

  • Run git rev-parse --is-inside-work-tree to confirm git is available
  • If not a git repo, inform the user and abort gracefully
  1. Read the git log since the last tag or release:

    git log --oneline [last-tag]..HEAD
    

    If no tags exist, read the full log or a reasonable recent range (last 100 commits).

  2. Read sprint reports from production/sprints/ for the relevant period to understand planned work and context behind changes.

  3. Read completed design documents from design/gdd/ for any new features that were implemented during this period.

  4. Categorize every change into one of these categories:

    • New Features: Entirely new gameplay systems, modes, or content
    • Improvements: Enhancements to existing features, UX improvements, performance gains
    • Bug Fixes: Corrections to broken behavior
    • Balance Changes: Tuning of gameplay values, difficulty, economy
    • Known Issues: Issues the team is aware of but have not yet resolved
  5. Generate the INTERNAL changelog (full technical detail):

# Internal Changelog: [Version]
Date: [Date]
Sprint(s): [Sprint numbers covered]
Commits: [Count] ([first-hash]..[last-hash])

## New Features
- [Feature Name] -- [Technical description, affected systems]
  - Commits: [hash1], [hash2]
  - Owner: [who implemented it]
  - Design doc: [link if applicable]

## Improvements
- [Improvement] -- [What changed technically and why]
  - Commits: [hashes]
  - Owner: [who]

## Bug Fixes
- [BUG-ID] [Description of bug and root cause]
  - Fix: [What was changed]
  - Commits: [hashes]
  - Owner: [who]

## Balance Changes
- [What was tuned] -- [Old value -> New value] -- [Design intent]
  - Owner: [who]

## Technical Debt / Refactoring
- [What was cleaned up and why]
  - Commits: [hashes]

## Known Issues
- [Issue description] -- [Severity] -- [ETA for fix if known]

## Metrics
- Total commits: [N]
- Files changed: [N]
- Lines added: [N]
- Lines removed: [N]
  1. Generate the PLAYER-FACING changelog (friendly, non-technical):
# What is New in [Version]

## New Features
- **[Feature Name]**: [Player-friendly description of what they can now do
  and why it is exciting. Focus on the experience, not the implementation.]

## Improvements
- **[What improved]**: [How this makes the game better for the player.
  Be specific but avoid jargon.]

## Bug Fixes
- Fixed an issue where [describe what the player experienced, not what was
  wrong in the code]
- Fixed [player-visible symptom]

## Balance Changes
- [What changed in player-understandable terms and the design intent.
  Example: "Healing potions now restore 50 HP (up from 30) -- we felt
  players needed more recovery options in late-game encounters."]

## Known Issues
- We are aware of [issue description in player terms] and are working on a
  fix. [Workaround if one exists.]

---
Thank you for playing! Your feedback helps us make the game better.
Report issues at [link].
  1. Output both changelogs to the user. The internal changelog is the primary working document. The player-facing changelog is ready for community posting after review.

Guidelines

  • Never expose internal code references, file paths, or developer names in the player-facing changelog
  • Group related changes together rather than listing individual commits
  • If a commit message is unclear, check the associated files and sprint data for context
  • Balance changes should always include the design reasoning, not just the numbers
  • Known issues should be honest -- players appreciate transparency
  • If the git history is messy (merge commits, reverts, fixup commits), clean up the narrative rather than listing every commit literally

Read the full file on GitHub · 134 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. 2d ago First seen · 134 lines · 29 tokens per session scan A a6ac81374cdc

Subscribe to this mod's changes

changelog is a skill published in the GitHub repository TraftG/opencode-game-studio (38 stars, last pushed 4mo ago), licensed MIT. It adds 29 tokens to every session and 1,104 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 2026-09-03.

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