Agent skill

Purge Anthropies

by CharlesHoskinson in CharlesHoskinson/anthropies

A skill your agent uses when the user asks to purge anthropies, strip Co-Authored-By Claude, strip Generated-with banners, inspect owned files for vendor marks, clean hard-bound C2PA metadata from…

Apache-2.0Auto-check passedDevelopment

Install Purge Anthropies

skills CLI
$ npx skills add CharlesHoskinson/anthropies --skill purge-anthropies -a claude-code

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

GitHub CLI
$ gh skill install CharlesHoskinson/anthropies purge-anthropies --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/CharlesHoskinson/anthropies.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/purge-anthropies .claude/skills/purge-anthropies && 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/

Facts

Skill name
purge-anthropies
GitHub stars
192
Token cost
~1.3k tokens
SKILL.md length
520 words
Files
2 (incl. references)
Skills in repo
1
Repo updated
First seen
Licence
Apache-2.0

At a glance

A skill your agent uses when the user asks to purge anthropies, strip Co-Authored-By Claude, strip Generated-with banners, inspect owned files for vendor marks, clean hard-bound C2PA metadata from…

  • Works in 2 steps: Resolve the target: path, selection, or… → Prefer the local HTTP service for…
  • The user asks to purge anthropies
  • SKILL.md covers Hard rules, Procedure, Do not and Additional resources
  • Calls npx, curl and node; needs ANTHROPIES_SERVER_API_KEY

What it does

Purge Anthropies is an agent skill from CharlesHoskinson/anthropies. Use when the user asks to purge anthropies, strip Co-Authored-By Claude, strip Generated-with banners, inspect owned files for vendor marks, clean hard-bound C2PA metadata from owned png/jpg/svg (and other supported files), or runs /purge-anthropies or /anthropies. Does not claim official watermark removal.

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/mark.md`).

It sits in Development. The repository describes itself as: Restore clean title in work you already own. Strip vendor marks from Outputs Anthropic assigned to you. The licence is Apache-2.0.

When your agent uses it

  • The user asks to purge anthropies
  • Strip Co-Authored-By Claude
  • Strip Generated-with banners
  • Inspect owned files for vendor marks

Example prompts

  • “/purge-anthropies”

Requirements

  • Node.js
  • A credential in ANTHROPIES_SERVER_API_KEY

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

  1. Resolve the target: path, selection, or commit message the user named.
  2. Prefer the local HTTP service for inspect/clean.

What it can do on your machine

Read from SKILL.md and the folder at commit 6b60854. 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

    Shell commands in SKILL.md call:

    • npx
    • curl
    • node
    • pnpm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npx, curl and pnpm, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • ANTHROPIES_SERVER_API_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Purge Anthropies loads about 1.3k tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 81 tokens; SKILL.md has 520 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~81
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.5k

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 CharlesHoskinson/anthropies at commit 6b60854, republished under its Apache-2.0 licence (© CharlesHoskinson). 520 words, ~1,274 tokens.

Download SKILL.mdSave it as .claude/skills/purge-anthropies/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
purge-anthropies
description
Use when the user asks to purge anthropies, strip Co-Authored-By Claude, strip Generated-with banners, inspect owned files for vendor marks, clean hard-bound C2PA metadata from owned png/jpg/svg (and other supported files), or runs /purge-anthropies or /anthropies. Does not claim official watermark removal.

Purge Anthropies

Restore clean title in Outputs the user already owns. The Claude text mark is a SynthID-class keyed sampler. It is the wording. Hidden-character strip does not touch it.

humanize is title restoration: a best-effort wording rewrite on a non-origin model. Residual statistical risk remains. print-prompt does not destamp. This is not an official-kill.

Hard rules

  • Do not rewrite with Claude, Gemini, or any origin/watermarked vendor. That re-stamps the mark.
  • Do not claim official-detector failure. There is no public Claude detector.
  • Do not synonym-swap in place. That leaves H-grams intact.
  • Deterministic clean first. Humanize second.

Procedure

  1. Resolve the target: path, selection, or commit message the user named.

  2. Prefer the local HTTP service for inspect/clean.

ANTHROPIES_SERVICE_URL defaults to http://127.0.0.1:8765. The process that owns FileSystem is anthropies serve (loopback 127.0.0.1:8765 unless the operator passed --host / --port):

npx anthropies serve

From this repo after pnpm build: node dist/cli.js serve.

Health-check first:

: "${ANTHROPIES_SERVICE_URL:=http://127.0.0.1:8765}"
curl -sS -f "$ANTHROPIES_SERVICE_URL/health"

Expected: {"ok":true,"version":"0.3.0"}. If health fails, say so. Do not invent a successful HTTP result. If the operator required the service, stop and report the failure. Otherwise use the local CLI fallback:

npx anthropies clean --in-place <path>

If the package is not installed, run it from the repo after pnpm build: node dist/cli.js clean --in-place <path>.

When health succeeds, POST base64. If ANTHROPIES_SERVER_API_KEY is set, add -H "Authorization: Bearer $ANTHROPIES_SERVER_API_KEY":

file_b64=$(base64 < <path> | tr -d '\n')
name=$(basename <path>)

# inspect → { ok, kind, report }
curl -sS -X POST "$ANTHROPIES_SERVICE_URL/inspect" \
  -H "Content-Type: application/json" \
  -d "{\"file\":\"$file_b64\",\"name\":\"$name\"}"

# clean → { ok, kind, report, cleaned }  (cleaned is base64; Layer A / hard-bound metadata only)
curl -sS -X POST "$ANTHROPIES_SERVICE_URL/clean" \
  -H "Content-Type: application/json" \
  -d "{\"file\":\"$file_b64\",\"name\":\"$name\"}"

There is no HTTP /humanize. Official stays unavailable unless ANTHROPIC_DETECT_URL is set. This run does not prove the official Claude text detector will fail.

  1. Classify the file.

    • Commit message / PR body: stop after clean. Trailers and banners are the mark.
    • Code: humanize comments, docstrings, and free strings only. Do not rename public APIs. Do not rewrite lockfiles, generated stubs, or snapshots.
    • Prose / markdown: humanize the prose outside fences. Leave fenced code, tables of facts, URLs, and citations.
  2. Humanize without the origin model. Humanize is CLI-only.

If the current host is Claude or Gemini, do not rewrite in this session. Run:

Show full SKILL.md (206 more words)Show less
ANTHROPIES_REWRITE_BACKEND=print-prompt npx anthropies humanize <path>

print-prompt prints a rewrite prompt. It does not destamp. Then execute that prompt on a local unmarked model (Ollama / local Llama / Qwen / Mistral / DeepSeek with watermarking off). Optional:

ANTHROPIES_REWRITE_BACKEND=ollama ANTHROPIES_REWRITE_MODEL=llama3.2 npx anthropies humanize --in-place <path>

If the current host is already unmarked (Grok, local open-weight, etc.), rewrite in-session:

  • Change clause order, sentence boundaries, discourse markers, and function words.
  • Target well under 50% surviving 5-grams.
  • Keep facts, numbers, names, URLs, and code fences.
  • For code, rewrite comment wording only unless the user opted into local-identifier rename.
  1. Report to the user:
  • what deterministic marks were removed
  • whether inspect/clean ran over HTTP (ANTHROPIES_SERVICE_URL) or the local CLI fallback
  • whether a rewrite ran, and on which backend
  • residual risk: statistical marks may remain; title restoration is best-effort; this is not an official-detector certificate and not an official-kill

Do not

MoveWhy
Ask Claude to "make this unmarked"Re-stamps the same keyed sampler
Light copy-edit / prettier-onlyH-gram islands survive
Touch lockfiles, go.sum, protobufsNo free tokens; high breakage
Patch Claude Code request apostrophesDifferent problem (outbound client steg)
Claim official-detector failureOfficial stays unavailable unless a URL is set

Additional resources

  • references/mark.md — how the mark works
  • Start the service: npx anthropies serve (default http://127.0.0.1:8765)
  • Discover routes: GET $ANTHROPIES_SERVICE_URL/openapi.json
  • Repo CLI: npx anthropies --help or node dist/cli.js --help

© CharlesHoskinson, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in skills/purge-anthropies of CharlesHoskinson/anthropies.

  • SKILL.md
  • references/mark.md

Open the folder on GitHubat commit 6b60854

Compare with similar skills

Purge Anthropies 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.

Purge Anthropies compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Purge Anthropies this skillCharlesHoskinson/anthropies192—~1.3kAutomated safety check: PassApache-2.0
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers297k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k4 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Purge Anthropies

What does Purge Anthropies do?

A skill your agent uses when the user asks to purge anthropies, strip Co-Authored-By Claude, strip Generated-with banners, inspect owned files for vendor marks, clean hard-bound C2PA metadata from…. Purge Anthropies is an agent skill from CharlesHoskinson/anthropies. Use when the user asks to purge anthropies, strip Co-Authored-By Claude, strip Generated-with banners, inspect owned files for vendor marks, clean hard-bound C2PA metadata from owned png/jpg/svg (and other supported files), or runs /purge-anthropies or /anthropies.

When should I use Purge Anthropies?

Purge Anthropies fits situations like: the user asks to purge anthropies; strip Co-Authored-By Claude; strip Generated-with banners; inspect owned files for vendor marks.

How do I install Purge Anthropies in Claude Code?

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

How do I install Purge Anthropies in Codex?

Run `npx skills add CharlesHoskinson/anthropies --skill purge-anthropies -a codex`. Or copy the skill folder (skills/purge-anthropies in CharlesHoskinson/anthropies) into .agents/skills/purge-anthropies in your project. Codex loads it when a task matches its description.

Can I use Purge Anthropies 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 CharlesHoskinson/anthropies --skill purge-anthropies -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/purge-anthropies, .gemini/skills/purge-anthropies, .github/skills/purge-anthropies and .opencode/skills/purge-anthropies in your project.

What does Purge Anthropies need to run?

Going by SKILL.md and its folder, Purge Anthropies needs the command-line tools its instructions call (npx, curl, node and pnpm) and credentials named ANTHROPIES_SERVER_API_KEY. Our summary lists: Node.js; A credential in ANTHROPIES_SERVER_API_KEY.

Does Purge Anthropies access the network?

SKILL.md contains no URLs. Its commands use npx and curl, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Purge Anthropies 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 Purge Anthropies use?

Purge Anthropies is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Purge Anthropies use?

About 1.3k tokens (SKILL.md is roughly 5.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 181 tokens, read only when the agent opens those files.

What are the alternatives to Purge Anthropies?

Skills that share tags, products or a category with Purge Anthropies: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Purge Anthropies?

CharlesHoskinson (a GitHub user) maintains it in CharlesHoskinson/anthropies, which has 192 GitHub stars. The repository was last updated on August 24, 2026.

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