Agent skill

Update Claude

by MillenniumDawn in MillenniumDawn/Millennium-Dawn

Summarize the current session and propose improvements to CLAUDE.md, rules, docs, and skills, applying them after user confirmation.

CC-BY-SA-4.0Auto-check passedAgent Workflows

Install Update Claude

skills CLI

$ npx skills add MillenniumDawn/Millennium-Dawn --skill update-claude -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install MillenniumDawn/Millennium-Dawn update-claude --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/MillenniumDawn/Millennium-Dawn.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/update-claude .claude/skills/update-claude && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "update-claude" agent skill from https://github.com/MillenniumDawn/Millennium-Dawn/tree/main/.claude/skills/update-claude into .claude/skills/update-claude/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-claude", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/MillenniumDawn/Millennium-Dawn/tree/main/.claude/skills/update-claude

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add MillenniumDawn/Millennium-Dawn --skill update-claude -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install MillenniumDawn/Millennium-Dawn update-claude --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MillenniumDawn/Millennium-Dawn.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/update-claude .agents/skills/update-claude && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "update-claude" agent skill from https://github.com/MillenniumDawn/Millennium-Dawn/tree/main/.claude/skills/update-claude into .agents/skills/update-claude/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-claude", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add MillenniumDawn/Millennium-Dawn --skill update-claude -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install MillenniumDawn/Millennium-Dawn update-claude --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MillenniumDawn/Millennium-Dawn.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/update-claude .cursor/skills/update-claude && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "update-claude" agent skill from https://github.com/MillenniumDawn/Millennium-Dawn/tree/main/.claude/skills/update-claude into .cursor/skills/update-claude/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-claude", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/MillenniumDawn/Millennium-Dawn.git --path .claude/skills/update-claude

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add MillenniumDawn/Millennium-Dawn --skill update-claude -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install MillenniumDawn/Millennium-Dawn update-claude --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MillenniumDawn/Millennium-Dawn.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/update-claude .gemini/skills/update-claude && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "update-claude" agent skill from https://github.com/MillenniumDawn/Millennium-Dawn/tree/main/.claude/skills/update-claude into .gemini/skills/update-claude/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-claude", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install MillenniumDawn/Millennium-Dawn update-claude

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add MillenniumDawn/Millennium-Dawn --skill update-claude -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/MillenniumDawn/Millennium-Dawn.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/update-claude .github/skills/update-claude && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "update-claude" agent skill from https://github.com/MillenniumDawn/Millennium-Dawn/tree/main/.claude/skills/update-claude into .github/skills/update-claude/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-claude", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add MillenniumDawn/Millennium-Dawn --skill update-claude -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install MillenniumDawn/Millennium-Dawn update-claude --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MillenniumDawn/Millennium-Dawn.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/update-claude .opencode/skills/update-claude && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "update-claude" agent skill from https://github.com/MillenniumDawn/Millennium-Dawn/tree/main/.claude/skills/update-claude into .opencode/skills/update-claude/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-claude", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: update-claude
GitHub stars: 139
Token cost: ~1k tokens
SKILL.md length: 445 words
Files: 1
Skills in repo: 24
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: CC-BY-SA-4.0

At a glance

Summarize the current session and propose improvements to CLAUDE.md, rules, docs, and skills, applying them after user confirmation.

Works in 5 steps: Summarize the session → Identify generalizable improvements → Check existing documentation for staleness → …
Tasks that involve Agent instruction files
SKILL.md covers Placement rules, Execution and Important Notes
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Update Claude is an agent skill from MillenniumDawn/Millennium-Dawn. Summarize the current session and propose improvements to CLAUDE.md, rules, docs, and skills, applying them after user confirmation. Use only when explicitly invoked.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Agent Workflows, covering Agent instruction files. The repository describes itself as: Millennium Dawn and it's codebase. The licence is CC-BY-SA-4.0.

When your agent uses it

Tasks that involve Agent instruction files

Example prompts

“/update-claude”

Workflow steps

5 steps, taken from the step headings in SKILL.md.

Summarize the session
Identify generalizable improvements
Check existing documentation for staleness
Propose changes
Apply changes (with confirmation)

What it can do on your machine

Read from SKILL.md and the folder at commit 5abce3e. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Update Claude loads about 1k tokens when it runs. Until then it costs about 45 tokens; SKILL.md has 445 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~45
When it runs · the whole SKILL.md, loaded when a task matches: ~1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from MillenniumDawn/Millennium-Dawn at commit 5abce3e, republished under its CC-BY-SA-4.0 licence (© MillenniumDawn). 445 words, ~1,010 tokens.

Download SKILL.mdSave it as .claude/skills/update-claude/SKILL.md (or your agent's skills folder).

name: update-claude
description: Summarize the current session and propose improvements to CLAUDE.md, rules, docs, and skills, applying them after user confirmation. Use only when explicitly invoked.
disable-model-invocation: true

Summarize the current conversation and propose improvements to CLAUDE.md, rules, and skills.

Syntax: /update-claude

Placement rules

One home per rule: grep .claude/ for an existing statement before adding anywhere; extend the existing home, and put at most a one-line pointer elsewhere.
Always-loaded files (CLAUDE.md, AGENTS.md, .claude/rules/*.md without paths: frontmatter) hold only high-frequency, broadly-applicable rules in <=2 lines; worked examples and niche topics go to .claude/docs/.
Every new .claude/docs file must be added to .claude/docs/documentation-references.md.
Backlogs, finding counts, and change history go in a GitHub issue or the commit message, never in a doc.
New skills need frontmatter (name + a trigger-quality description); never add tables duplicating harness-injected lists.
Topic guidance that should auto-load for certain files → .claude/rules/*.md with paths: glob frontmatter.

Execution

1. Summarize the session

Review the full conversation and extract:

What was built or changed — new files, refactored systems, validator additions, etc.
Patterns discovered — recurring issues, anti-patterns, common mistakes found during the work.
Rules applied or created — coding conventions, scripting patterns, or process rules that emerged.
Decisions made — architectural choices, tradeoffs, why something was done a certain way.

2. Identify generalizable improvements

For each pattern or rule, assess whether it applies broadly or only to the specific task:

Essential shared guardrails → AGENTS.md, with no implementation recipes
Scripting and tooling details → the existing domain reference or tools/README.md
Player/contributor guidance → the appropriate existing page under docs/src/content/
Task-based reading pointers → .claude/rules/ or AGENTS.md
Skill improvements → .claude/skills/*/SKILL.md
Project context (non-obvious, persists across sessions) → memory

Filter ruthlessly — only propose additions that:

Cannot be derived by reading the current codebase
Would prevent a future mistake or speed up future work
Are general enough to apply beyond the specific files touched

Show full SKILL.md (167 more words)Show less

3. Check existing documentation for staleness

Read the current state of:

CLAUDE.md and AGENTS.md routing: do their pointers still reach the right guidance?
Always-loaded files (AGENTS.md, unscoped .claude/rules/*.md): has implementation detail crept back in?
.claude/docs/localisation-rules.md — any gaps?
AGENTS.md — any conventions needing updates?

Flag anything outdated or contradicting current practice.

4. Propose changes

Lead with the recommended change in BLUF style. Include only applicable sections:

## Rules to add/update
- [file] — [what to add] — [why]

## Skills to add/update
- [skill name] — [what changed] — [why]

## Documentation to update
- [file] — [what's stale] — [what it should say]

## Memory to save
- [type] — [content] — [why it matters for future sessions]

5. Apply changes (with confirmation)

After presenting the proposals, ask the user which to apply. Then:

Edit the relevant files directly
Update the documentation index and task pointers when destinations change
Save any memory items

Important Notes

Do NOT add implementation details, file paths, or architecture derivable from reading the code.
Do NOT duplicate what's already in AGENTS.md or existing rules files.
Focus on why not what — rules should explain the reasoning so edge cases can be judged.
Keep rules concise — one pattern per entry, with a wrong/right example where helpful.
Check for conflicts before adding — grep the rules files to avoid contradictions.

Files

Just SKILL.md in .claude/skills/update-claude of MillenniumDawn/Millennium-Dawn.

Open the folder on GitHubat commit 5abce3e

Compare with similar skills

Update Claude next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Update Claude compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Update Claude this skillMillenniumDawn/Millennium-Dawn	139	—	~1k	Automated safety check: Pass	CC-BY-SA-4.0	today
Using Agent Skillsaddyosmani/agent-skills	103k	4 repos	~2.4k	Automated safety check: Pass	MIT	5 days ago
Claude ReflectBayramAnnakov/claude-reflect	1.7k	2 repos	~627	Automated safety check: Pass	MIT	6 days ago
Neat-Freak Knowledge CloseoutKKKKhazix/khazix-skills	21k	—	~1.9k	Automated safety check: Pass	MIT	8 days ago
Writing For Agentsbestofjs/bestofjs	3.1k	18 repos	~2.7k	Automated safety check: Pass	MIT	4 days ago
Task Observerrebelytics/one-skill-to-rule-them-all	3.2k	1 repos	~12k	Automated safety check: Pass	CC-BY-4.0	7 days ago

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Questions about Update Claude

What does Update Claude do?

Summarize the current session and propose improvements to CLAUDE.md, rules, docs, and skills, applying them after user confirmation. Update Claude is an agent skill from MillenniumDawn/Millennium-Dawn.md, rules, docs, and skills, applying them after user confirmation.

When should I use Update Claude?

Update Claude fits situations like: tasks that involve Agent instruction files.

How do I install Update Claude in Claude Code?

Run `npx skills add MillenniumDawn/Millennium-Dawn --skill update-claude -a claude-code`. Or copy the skill folder (.claude/skills/update-claude in MillenniumDawn/Millennium-Dawn) into .claude/skills/update-claude in your project. Claude Code loads it when a task matches its description.

How do I install Update Claude in Codex?

Run `npx skills add MillenniumDawn/Millennium-Dawn --skill update-claude -a codex`. Or copy the skill folder (.claude/skills/update-claude in MillenniumDawn/Millennium-Dawn) into .agents/skills/update-claude in your project. Codex loads it when a task matches its description.

Can I use Update Claude in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add MillenniumDawn/Millennium-Dawn --skill update-claude -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/update-claude, .gemini/skills/update-claude, .github/skills/update-claude and .opencode/skills/update-claude in your project.

What does Update Claude need to run?

SKILL.md names no scripts, command-line tools or credentials: Update Claude is instructions for the agent only.

Does Update Claude access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Update Claude safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Update Claude use?

Update Claude is published under the CC-BY-SA-4.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Update Claude use?

About 1k tokens (SKILL.md is roughly 4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Update Claude?

Skills that share tags, products or a category with Update Claude: Using Agent Skills (addyosmani/agent-skills, 103k stars), Claude Reflect (BayramAnnakov/claude-reflect, 1.7k stars), Neat-Freak Knowledge Closeout (KKKKhazix/khazix-skills, 21k stars) and Writing For Agents (bestofjs/bestofjs, 3.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Update Claude?

MillenniumDawn (a GitHub organization) maintains it in MillenniumDawn/Millennium-Dawn, which has 139 GitHub stars. The repository holds 24 skills in this directory. The repository was last updated on October 9, 2026.

Source: MillenniumDawn/Millennium-Dawn on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Update Claude

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Placement rules

Execution

1. Summarize the session

2. Identify generalizable improvements

3. Check existing documentation for staleness

4. Propose changes

5. Apply changes (with confirmation)

Important Notes

Files

Compare with similar skills

Similar skills

More from MillenniumDawn/Millennium-Dawn

Related

Questions about Update Claude