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Validates the context file for a Nucleus V2 workflow run, discovers standalone context from explicit input, and writes a blocked result when required context is missing.
SKILL.md written in Chinese; this summary is our English description.
Install Nucleus Context Validator
$ npx skills add protect-my-hair/nucleus-marketplace --skill nucleus-context -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace nucleus-context --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/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/nucleus/skills/nucleus-context .claude/skills/nucleus-context && 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 "nucleus-context" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/nucleus-context into .claude/skills/nucleus-context/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nucleus-context", 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/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/nucleus-contextType 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 protect-my-hair/nucleus-marketplace --skill nucleus-context -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace nucleus-context --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/nucleus/skills/nucleus-context .agents/skills/nucleus-context && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "nucleus-context" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/nucleus-context into .agents/skills/nucleus-context/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nucleus-context", 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 protect-my-hair/nucleus-marketplace --skill nucleus-context -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace nucleus-context --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/nucleus/skills/nucleus-context .cursor/skills/nucleus-context && 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 "nucleus-context" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/nucleus-context into .cursor/skills/nucleus-context/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nucleus-context", 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/protect-my-hair/nucleus-marketplace.git --path plugins/nucleus/skills/nucleus-context--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 protect-my-hair/nucleus-marketplace --skill nucleus-context -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace nucleus-context --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/nucleus/skills/nucleus-context .gemini/skills/nucleus-context && 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 "nucleus-context" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/nucleus-context into .gemini/skills/nucleus-context/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nucleus-context", 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 protect-my-hair/nucleus-marketplace nucleus-contextInstalls 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 protect-my-hair/nucleus-marketplace --skill nucleus-context -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/nucleus/skills/nucleus-context .github/skills/nucleus-context && 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 "nucleus-context" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/nucleus-context into .github/skills/nucleus-context/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nucleus-context", 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 protect-my-hair/nucleus-marketplace --skill nucleus-context -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace nucleus-context --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/nucleus/skills/nucleus-context .opencode/skills/nucleus-context && 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 "nucleus-context" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/nucleus-context into .opencode/skills/nucleus-context/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nucleus-context", 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
nucleus-context- GitHub stars
- 164
- Token cost
- ~576 tokens
- SKILL.md length
- 90 words
- Files
- 7 (incl. scripts, references, assets)
- Skills in repo
- 18
- Repo updated
- First seen
- Licence
- MIT
At a glance
Validates the context file for a Nucleus V2 workflow run, discovers standalone context from explicit input, and writes a blocked result when required context is missing.
- Validating the Nucleus context file before a workflow continues
- SKILL.md covers 边界, 子命令, 输出 and 失败策略
- Runs Python scripts from its folder; calls python3
- Generating a local context candidate from explicit standalone input
What it does
The SKILL.md is in Chinese. This skill runs inside a coding agent such as Claude Code or Codex and is neither a backend nor a service. It limits process artifacts to the target repository's .nucleus folder, treats docs/requirement as a protected read-only source of requirements, and blocks any planned write to legacy risk paths. Discovery accepts only explicit input, with no free-form language parsing, no deep knowledge base scan and no invented product, repository or run. Without a workflow run ID it may only produce a local diagnostic blocked result.
A Python script, nucleus_context.py, has three subcommands: validate, discover and build-blocked-result. Success writes a validation gate file or a context file with a discovery report. A missing primary feature produces a context candidate and a blocked result, and an unsafe repository root prints a blocked payload with a non-zero exit and writes nothing. Every failure defaults to alert and block, and a natural-language summary never replaces the result package. A candidate template and three reference files are bundled.
When your agent uses it
- Validating the Nucleus context file before a workflow continues
- Generating a local context candidate from explicit standalone input
- Getting a structured blocked result when required context fields are absent
- Checking that planned writes avoid protected and legacy paths
Example prompts
- “Validate the Nucleus context file for the current workflow run in this repository.”
- “Run standalone discovery for this repo using the feature name and goal I give you.”
- “The context is missing the primary feature; produce the blocked result package.”
- “Check whether any planned writes in this run touch the legacy paths.”
Requirements
- Python 3 to run nucleus_context.py
- A target repository using the .nucleus folder layout
What it can do on your machine
Read from SKILL.md and the folder at commit 3c82085. 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
Ships 1 file in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
python3
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
Nucleus Context Validator loads about 576 tokens when it runs, and up to ~1.1k if it reads all its reference files. Until then it costs about 57 tokens; SKILL.md has 90 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 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); the scripts in this folder are not scanned.
SKILL.md
The full file from protect-my-hair/nucleus-marketplace at commit 3c82085, republished under its MIT licence (© protect-my-hair). 90 words, ~576 tokens.
Download SKILL.mdSave it as
.claude/skills/nucleus-context/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.- name
- nucleus-context
- description
- Nucleus V2 baseline context validation and explicit standalone context discovery. Use when a workflow needs .nucleus/context validation, local candidate generation, or a blocked result for missing context fields.
Nucleus Context
本 Skill 负责 Nucleus V2 baseline 的 context 入口能力。它安装在 Claude Code / Codex 等 coding agent 内部使用，不是 PMS 后端，也不是独立服务。
边界
- 只使用目标仓库
.nucleus/**作为过程产物路径。 docs/requirement/**是受保护需求事实源；本 Skill 只读引用，不正式写入。.autocode/**、.claude/notepads/**、docs/bugfix/**是 legacy risk path，命中 plannedWrites 必须阻塞。- baseline
discover只接受显式输入，不做自然语言自由解析、不深扫知识库、不伪造 PMS product/repo/run。 - 缺
workflowRunId时只能生成 local diagnostic blocked result；不得写.nucleus/context/<synthetic>.json，不得让后续 workflow 用 synthetic id 继续。
子命令
python3 skills/nucleus-context/scripts/Nucleus_context.py validate \
--repo-root <target-repo> \
--context <target-repo>/.nucleus/context/<workflowRunId>.jsonpython3 skills/nucleus-context/scripts/Nucleus_context.py discover \
--repo-root <target-repo> \
--mode standalone-assistant \
--workflow-run-id <workflowRunId> \
--workflow-id feature-development-prepare \
--workflow-step context-validation \
--provider codex \
--primary-feature docs/features/<path>/feature.md \
--requirement-solution docs/requirement/<req>/solution.mdpython3 skills/nucleus-context/scripts/Nucleus_context.py build-blocked-result \
--repo-root <target-repo> \
--workflow-run-id <workflowRunId> \
--workflow-id feature-development-prepare \
--workflow-step context-validation \
--blocker-code SCHEMA_VALIDATION_FAILED \
--message "context 缺少必需字段"输出
validate成功：写.nucleus/runs/<workflowRunId>/context-validation-gate.json。discover成功：写.nucleus/context/<workflowRunId>.json和.nucleus/runs/<workflowRunId>/context-discovery-report.json。- 缺 primary feature：写
.nucleus/runs/<workflowRunId>/context-candidate.json和 blocked.nucleus/runs/<workflowRunId>/result.json，不写正式 context。 - 缺
workflowRunId且 repo root 安全：写.nucleus/runs/wf-local-blocked-<timestamp>-<hash>/result.json，contextPath=null。 - repo root 不安全：stdout 输出 machine-readable blocked payload，非零退出，不写目标仓库。
失败策略
所有失败默认 ALERT_AND_BLOCK。不要用自然语言总结替代 result package。
© protect-my-hair, 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 6 other files (scripts, references, assets) in plugins/nucleus/skills/nucleus-context of protect-my-hair/nucleus-marketplace.
- SKILL.md
- agents/openai.yaml
- assets/context-candidate-template.json
- references/blocker-matrix.md
- references/context-contract.md
- references/mode-policy.md
- scripts/nucleus_context.py
Open the folder on GitHubat commit 3c82085
Compare with similar skills
Nucleus Context Validator 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 |
|---|---|---|---|---|---|---|
| Nucleus Context Validator this skillprotect-my-hair/nucleus-marketplace | 164 | — | ~576 | Automated safety check: Pass | MIT | |
| Claude Statusbarleeguooooo/claude-code-usage-bar | 378 | — | ~2.6k | Automated safety check: Pass | MIT | |
| Cognee Session Memory and Improvetopoteretes/cognee | 32k | — | ~3.2k | Automated safety check: Pass | Apache-2.0 | |
| MoAI Foundation Coremodu-ai/moai-adk | 1.2k | — | ~5k | Automated safety check: Pass | Apache-2.0 | |
| RlmBowTiedSwan/rlm-skill | 182 | — | ~928 | Automated safety check: Pass | None | |
| File-Based Planning in ArabicOthmanAdi/planning-with-files | 27k | — | ~3.2k | Automated safety check: Notes | MIT |
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Related
Works with
Categories
Questions about Nucleus Context Validator
What does Nucleus Context Validator do?
Validates the context file for a Nucleus V2 workflow run, discovers standalone context from explicit input, and writes a blocked result when required context is missing. md is in Chinese. This skill runs inside a coding agent such as Claude Code or Codex and is neither a backend nor a service.
When should I use Nucleus Context Validator?
Nucleus Context Validator fits situations like: validating the Nucleus context file before a workflow continues; generating a local context candidate from explicit standalone input; getting a structured blocked result when required context fields are absent; checking that planned writes avoid protected and legacy paths.
How do I install Nucleus Context Validator in Claude Code?
Run `npx skills add protect-my-hair/nucleus-marketplace --skill nucleus-context -a claude-code`. Or copy the skill folder (plugins/nucleus/skills/nucleus-context in protect-my-hair/nucleus-marketplace) into .claude/skills/nucleus-context in your project. Claude Code loads it when a task matches its description.
How do I install Nucleus Context Validator in Codex?
Run `npx skills add protect-my-hair/nucleus-marketplace --skill nucleus-context -a codex`. Or copy the skill folder (plugins/nucleus/skills/nucleus-context in protect-my-hair/nucleus-marketplace) into .agents/skills/nucleus-context in your project. Codex loads it when a task matches its description.
Can I use Nucleus Context Validator 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 protect-my-hair/nucleus-marketplace --skill nucleus-context -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/nucleus-context, .gemini/skills/nucleus-context, .github/skills/nucleus-context and .opencode/skills/nucleus-context in your project.
What does Nucleus Context Validator need to run?
Going by SKILL.md and its folder, Nucleus Context Validator needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3 to run nucleus_context.py; A target repository using the .nucleus folder layout.
Does Nucleus Context Validator 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 Nucleus Context Validator 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Nucleus Context Validator use?
Nucleus Context Validator 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 Nucleus Context Validator use?
About 576 tokens (SKILL.md is roughly 2.3k 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 493 tokens, read only when the agent opens those files.
What are the alternatives to Nucleus Context Validator?
Skills that share tags, products or a category with Nucleus Context Validator: Claude Statusbar (leeguooooo/claude-code-usage-bar, 378 stars), Cognee Session Memory and Improve (topoteretes/cognee, 32k stars), MoAI Foundation Core (modu-ai/moai-adk, 1.2k stars) and Rlm (BowTiedSwan/rlm-skill, 182 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Nucleus Context Validator?
protect-my-hair (a GitHub user) maintains it in protect-my-hair/nucleus-marketplace, which has 164 GitHub stars. The repository holds 18 skills in this directory. The repository was last updated on July 23, 2026.
Source: protect-my-hair/nucleus-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.