MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Check that an Open Knowledge Format (OKF) bundle is conformant with the v0.2 spec (§11).
MITAuto-check: notes
Install Validate
$ npx skills add scaccogatto/okf-skills --skill validate -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install scaccogatto/okf-skills validate --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/scaccogatto/okf-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/validate .claude/skills/validate && rm -rf skills-srcUse ~/.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/
Install the "validate" agent skill from https://github.com/scaccogatto/okf-skills/tree/main/skills/validate into .claude/skills/validate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate", 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 install https://github.com/scaccogatto/okf-skills/tree/main/skills/validateType 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.
$ npx skills add scaccogatto/okf-skills --skill validate -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install scaccogatto/okf-skills validate --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/scaccogatto/okf-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/validate .agents/skills/validate && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "validate" agent skill from https://github.com/scaccogatto/okf-skills/tree/main/skills/validate into .agents/skills/validate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate", 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.
$ npx skills add scaccogatto/okf-skills --skill validate -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install scaccogatto/okf-skills validate --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/scaccogatto/okf-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/validate .cursor/skills/validate && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "validate" agent skill from https://github.com/scaccogatto/okf-skills/tree/main/skills/validate into .cursor/skills/validate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate", 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 https://github.com/scaccogatto/okf-skills.git --path skills/validate--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add scaccogatto/okf-skills --skill validate -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install scaccogatto/okf-skills validate --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/scaccogatto/okf-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/validate .gemini/skills/validate && rm -rf skills-srcUse ~/.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/
Install the "validate" agent skill from https://github.com/scaccogatto/okf-skills/tree/main/skills/validate into .gemini/skills/validate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate", 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.
$ gh skill install scaccogatto/okf-skills validateInstalls 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).
$ npx skills add scaccogatto/okf-skills --skill validate -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/scaccogatto/okf-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/validate .github/skills/validate && rm -rf skills-srcUse ~/.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/
Install the "validate" agent skill from https://github.com/scaccogatto/okf-skills/tree/main/skills/validate into .github/skills/validate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate", 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.
$ npx skills add scaccogatto/okf-skills --skill validate -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install scaccogatto/okf-skills validate --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/scaccogatto/okf-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/validate .opencode/skills/validate && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "validate" agent skill from https://github.com/scaccogatto/okf-skills/tree/main/skills/validate into .opencode/skills/validate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate", 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
validate- GitHub stars
- 408
- Token cost
- ~941 tokens
- SKILL.md length
- 463 words
- Files
- 2 (incl. scripts)
- Skills in repo
- 4
- Repo updated
- First seen
- Licence
- MIT
At a glance
Check that an Open Knowledge Format (OKF) bundle is conformant with the v0.2 spec (§11).
- Asked to validate
- SKILL.md covers Migrating a v0.1 bundle and Exit codes
- Runs Python scripts from its folder; calls uv, python3 and npx
- Check an OKF bundle
What it does
Validate is an agent skill from scaccogatto/okf-skills. Check that an Open Knowledge Format (OKF) bundle is conformant with the v0.2 spec (§11). Use when asked to validate, lint, or check an OKF bundle, or before committing changes to one. Runs a deterministic Python checker — not an eyeball pass. Also migrates a v0.1 bundle to v0.2 in place with --migrate.
Its SKILL.md is about 940 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including scripts (for example `scripts/okf_validate.py`).
It works with Python. The repository describes itself as: The OKF toolkit for Claude Code — author, maintain, validate & visualize Open Knowledge Format bundles. Plugin, agent skills, and a GitHub Action. The licence is MIT.
When your agent uses it
- Asked to validate
- Check an OKF bundle
- Before committing changes to one
Example prompts
- “/validate”
Requirements
- Python 3
- Node.js
- Pre-approved tools (allowed-tools): Bash
What it can do on your machine
Read from SKILL.md and the folder at commit 8e31878. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
Bash
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
uvpython3npx
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use uv and npx, 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 no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Validate loads about 941 tokens when it runs. Until then it costs about 79 tokens; SKILL.md has 463 words of instructions outside code blocks.
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: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Bash
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); the scripts in this folder are not scanned.
SKILL.md
The full file from scaccogatto/okf-skills at commit 8e31878, republished under its MIT licence (© scaccogatto). 463 words, ~941 tokens.
Download SKILL.mdSave it as
.claude/skills/validate/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- validate
- description
- Check that an Open Knowledge Format (OKF) bundle is conformant with the v0.2 spec (§11). Use when asked to validate, lint, or check an OKF bundle, or before committing changes to one. Runs a deterministic Python checker — not an eyeball pass. Also migrates a v0.1 bundle to v0.2 in place with `--migrate`.
- allowed-tools
- Bash
- user-invocable
- true
- argument-hint
- [bundle-dir] [--strict | --max-warnings N] [--migrate]
Validate an OKF bundle
Run the deterministic conformance checker against the target bundle. Default to
the project's .okf/ directory when no path is given.
uv run "${CLAUDE_SKILL_DIR}/scripts/okf_validate.py" $ARGUMENTSIf uv is unavailable, fall back to:
python3 -m pip install --quiet pyyaml && \
python3 "${CLAUDE_SKILL_DIR}/scripts/okf_validate.py" $ARGUMENTS${CLAUDE_SKILL_DIR} resolves whether this skill runs as part of the okf
plugin or is installed standalone (e.g. via npx skills add), so the checker is
always found alongside the skill.
Interpret the result:
- ERROR → a hard §11 conformance failure (no parseable frontmatter, a
missing/empty
type, or a file the checker cannot read as UTF-8). The bundle is non-conformant. Fix every one.
Only index.md and log.md are reserved: §11.1 makes every other .md in
the tree a concept, convention files included. An AGENTS.md or README.md
dropped next to a bundle is therefore an ERROR until it carries frontmatter with
a type (Document reads well), which is the fix; a skip-list would put the
checker out of conformance. Move the file above the bundle root if it is not
knowledge.
- warn → soft guidance (missing recommended field, non-ISO log date, broken
cross-link, a malformed v0.2 family, a footnote naming no source, an actor
that misses the §7 shapes, an Attested Computation missing
runtime, a computation path that resolves nowhere, frontmatter in a reserved file (§8, §9), a rootindex.mdcarrying extra keys or declaring a differentokf_version(§12)). Never blocks; broken links in particular are explicitly tolerated by the spec (§6.1). Fix when cheap.
One warning is worth more than the others: a §7 near-miss such as Human:dana
or human/dana. §5.3 keys trust tiers off the exact lowercase human: prefix,
so the concept silently reads as machine-confirmed when a person did review it.
Fix that one on sight.
v0.1 bundles validate too: a legacy timestamp or # Citations section is
reported as a warning naming its v0.2 replacement (generated.at, sources),
never as an error (§13.1). Under --strict those warnings do fail the run —
that is the migration nudge, and --migrate is the door.
Show full SKILL.md (143 more words)Show less
Migrating a v0.1 bundle
--migrate rewrites the bundle in place before validating — the one mode of
this skill that is not read-only, so say what it will touch before running it on
a bundle the user has not asked to migrate. It is textual (comments, key order
and quoting survive) and idempotent.
uv run "${CLAUDE_SKILL_DIR}/scripts/okf_validate.py" .okf --migrate --strictIt hoists timestamp to generated: { by: process:okf-migrate, at }, lifts a
# Citations list into sources, and bumps okf_version. Two limits worth
repeating to the user: generated.by cannot be recovered for pre-v0.2 content
(hence the process: actor — the concept stays correctly unverified under
§5.3), and per-claim [^id] attribution was never encoded in v0.1, so only the
source list moves up.
Exit codes
Non-zero if any error is present, or if warnings exceed the gate:
--strict allows none, --max-warnings N allows N, the default allows any.
Add --json for machine-readable output (useful in CI).
© scaccogatto, MIT. 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 (scripts) in skills/validate of scaccogatto/okf-skills.
- SKILL.md
- scripts/okf_validate.py
Open the folder on GitHubat commit 8e31878
Compare with similar skills
Validate 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Validate this skillscaccogatto/okf-skills | 408 | — | ~941 | Automated safety check: Notes | MIT | |
| MCP Server Builderanthropics/skills | 180k | 64 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| PDF Processinganthropics/skills | 180k | 48 repos | ~2k | Automated safety check: Pass | Proprietary | |
| NotebookLM Research AssistantPleasePrompto/notebooklm-skill | 7.8k | 14 repos | ~2.4k | Automated safety check: Notes | MIT | |
| Manim Video Productionbrowser-use/video-use | 28k | 6 repos | ~3k | Automated safety check: Pass | MIT | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT |
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Works with
Questions about Validate
What does Validate do?
Check that an Open Knowledge Format (OKF) bundle is conformant with the v0.2 spec (§11). Validate is an agent skill from scaccogatto/okf-skills.2 spec (§11).
When should I use Validate?
Validate fits situations like: asked to validate; check an OKF bundle; before committing changes to one.
How do I install Validate in Claude Code?
Run `npx skills add scaccogatto/okf-skills --skill validate -a claude-code`. Or copy the skill folder (skills/validate in scaccogatto/okf-skills) into .claude/skills/validate in your project. Claude Code loads it when a task matches its description.
How do I install Validate in Codex?
Run `npx skills add scaccogatto/okf-skills --skill validate -a codex`. Or copy the skill folder (skills/validate in scaccogatto/okf-skills) into .agents/skills/validate in your project. Codex loads it when a task matches its description.
Can I use Validate 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 scaccogatto/okf-skills --skill validate -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/validate, .gemini/skills/validate, .github/skills/validate and .opencode/skills/validate in your project.
What does Validate need to run?
Going by SKILL.md and its folder, Validate needs Python for the scripts in its folder and the command-line tools its instructions call (uv, python3 and npx). Our summary lists: Python 3; Node.js. Its frontmatter pre-approves these tools: Bash.
Does Validate access the network?
SKILL.md contains no URLs. Its commands use uv and npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Validate safe to install?
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Validate use?
Validate is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Validate use?
About 941 tokens (SKILL.md is roughly 3.8k 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 Validate?
Skills that share tags, products or a category with Validate: MCP Server Builder (anthropics/skills, 180k stars), PDF Processing (anthropics/skills, 180k stars), NotebookLM Research Assistant (PleasePrompto/notebooklm-skill, 7.8k stars) and Manim Video Production (browser-use/video-use, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Validate?
scaccogatto (a GitHub user) maintains it in scaccogatto/okf-skills, which has 408 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on September 28, 2026.
Source: scaccogatto/okf-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.