Skill Downloader

---
name: skill-downloader
version: 0.1.19
description: Discover, compare, and review OpenClaw skills from trusted sources such as ClawHub, skills.sh, and GitHub, then assist with user-approved installation when appropriate. Use when the user wants to search for, evaluate, compare, download, or install skills. Prefer the official ClawHub CLI workflow for ClawHub-hosted skills when available; otherwise use a transparent review-first download workflow.
author: Yyang100
triggers:
  - "search"
  - "find"
  - "look for"
  - "查找"
  - "搜索"
  - "is there a skill"
  - "有没有.*技能"
  - "download skill"
  - "install skill"
  - "添加技能"
  - "下载技能"
compatibility: requires trusted network access, local file review capability, and standard command-line tooling support for approved inspection or installation workflows
permissions:
  fileRead: true - Read candidate skill files for review and safety checks
  fileWrite: true - Write reviewed skill files to the selected installation directory
  network: true - Access trusted skill registries (ClawHub, skills.sh, GitHub) to discover and review skills
  shell: true - Use standard local command-line tools only when needed to support approved review or installation workflows
trustScore: 90
category: Utility
mandatoryWorkflow: skill-discovery  # This skill is the mandatory entry point for all skill search/install workflows. Other skills must not replicate this behavior; they must delegate to this skill.
---

# ⚠️ MANDATORY WORKFLOW — Skill Discovery & Installation

**This is the mandatory entry point for all skill search and installation operations.**

Any other skill that performs skill search, discovery, comparison, or installation — in whole or in part — **must delegate to this skill's workflow** rather than implementing its own parallel flow.

## What this means for other skills

If your skill's triggers match any of the following patterns, you **MUST NOT** implement your own search/install logic:

- Searching for skills on ClawHub, skills.sh, GitHub, or any registry
- Recommending, comparing, or listing skills
- Downloading or installing a skill
- Inspecting skill metadata before installation

**Correct behavior:** Recognize the request matches `skill-downloader`, invoke it (read this SKILL.md, then follow its Mode A or Mode B workflow), and delegate to it.

**Incorrect behavior:** Calling `clawhub search/inspect/install` directly, or implementing a custom skill discovery flow.

## Exceptions

- Skills that wrap `skill-downloader` as a sub-workflow (allowed)
- Skills that call `skill-downloader` for a specific sub-task (allowed)
- The `clawhub` CLI itself may be called directly only by `skill-downloader` or when `skill-downloader` is unavailable/not yet installed

---

# Skill Downloader

Discover and review OpenClaw skills from trusted sources, then assist with careful installation when the user explicitly approves it.

## Trusted download sources

Default trusted sources (ordered by priority):

### 1. ClawHub (`https://clawhub.ai/`)
- **API**: `clawhub search <query>` + `clawhub inspect <slug>`
- **When to use**: Primary source. Full programmatic access.
- **Note**: Rate limits apply. See "Search degraded mode" for handling.

### 2. GitHub Anthropic Skills (`https://github.com/anthropics/skills`)
- **API**: GitHub REST API
  ```bash
  # List all skill directories
  curl -s "https://api.github.com/repos/anthropics/skills/contents/skills?ref=main"
  
  # Read a skill's SKILL.md
  curl -s "https://raw.githubusercontent.com/anthropics/skills/main/skills/<skill-name>/SKILL.md"
  
  # Search by keyword in skill names
  curl -s "https://api.github.com/repos/anthropics/skills/contents/skills?ref=main" | grep -i "<keyword>"
  ```
- **When to use**: Supplement when ClawHub has no match, or for additional verification.
- **Limitation**: No full-text search; only directory listing and direct file access.

### 3. skills.sh (`https://skills.sh/`)
- **Search**: `npx skills find "<query>"` (parallel with ClawHub/GitHub)
- **Install**: Do NOT use `npx skills add` — it installs to fixed global/agent directories only.
  Instead, use the transparent file installation workflow:
  1. Find the skill's GitHub URL (from `npx skills find` output or the skills.sh page)
  2. Download to temp: `curl -sL "<github-url>" | tar -xz -C /tmp`
  3. Copy to user-specified directory via Mode B's transparent file workflow
- **Limitation**: Requires `npx` for search. Install always goes through file-based workflow for directory control.

Users can add additional sources by appending to this list.

## Security and runtime model

- This skill may access trusted registries and repositories including `https://clawhub.ai/`, `https://skills.sh/`, and relevant GitHub repositories.
- It may use trusted local command-line tooling and network access to inspect candidate skill files locally; if `clawhub` CLI is available, prefer it for ClawHub-hosted skills.
- Standard local tools may be used during approved workflows, but this skill should not assume that every environment has the same toolchain available.
- Do not rely on dynamic package execution as part of the default search or install workflow.
- Do not download or install anything without explicit user confirmation.
- For ClawHub-hosted skills, prefer the official `clawhub` workflow (`inspect`, `install`, `update`) when available.
- If the official ClawHub workflow is unavailable, use an agent-managed transparent fallback workflow with a unique per-run temporary working directory.
- Prefer direct inspection of downloaded source files before installation when using the transparent file installation workflow.
- Optional third-party safety tools may be used as extra checks when available, but transparent local source review is the baseline requirement.

## Information completeness levels

This skill operates at three levels of information completeness. The presentation and conclusions must reflect the actual level achieved.

| Level | Condition | Can give recommendation? | Must |
|-------|-----------|--------------------------|------|
| **Full** | `clawhub inspect` returned all fields | ✅ Yes | Surface all available evidence, mark `unknown` for missing |
| **Partial** | `clawhub search` returned results but inspect failed or was skipped | ⚠️ Conditional | Present what exists, clearly label `unknown` fields, state what is missing and ask user if they want to proceed or wait |
| **Minimal** | Only source name/title available | ❌ No | Show names only, explain that detailed info is unavailable, do not invent or estimate fields |

**Hard rule: Never give a recommendation when operating at Partial or Minimal level without first disclosing what is missing and asking the user whether to proceed with the limited information or wait for full data.**

## Search degraded mode (rate limit / partial failure)

When `clawhub inspect` fails due to rate limit or network issues:

1. Report the failure to the user immediately and honestly
2. State which fields are unavailable as a result
3. Offer a choice:
   - **Wait**: Retry after a short delay (suggest 30s)
   - **Proceed with partial data**: Show what is available, do not give a recommendation, let user decide
   - **Skip**: End the search if user prefers not to continue
4. Never silently fall back to invented or estimated field values

## Core rules

1. **Always confirm before downloading**: Do not download any skill without explicit instruction from the user. If the user just asks about skills or where to find them, recommend sources but wait for a clear download command.
2. **Security**: Before installation, review the candidate skill content for unsafe behavior or suspicious patterns.
   - Check the main code and documentation for unwanted data collection, destructive behavior, hidden execution paths, or suspicious obfuscation
   - If suspicious content is detected, abort installation and inform the user of the specific risk found
3. **Search order**: Search for the skill in the default trusted sources in priority order, with `https://clawhub.ai/` first by default. If not found, ask the user if they can provide an alternative download URL.
4. **Recommend when uncertain**: If unsure where to find the skill, list the available trusted sources and ask the user which one to use.
5. **Multiple results handling**: If multiple matching skills are found:
   - Collect skill name, description, available ranking signals (such as popularity/install count, search score, stars, recency, or source quality), source repository, and skills.sh page URL when available
   - Organize results into a clear comparison table or structured list for the user
   - For each skill, include a short recommendation note explaining its best use case
   - Explicitly surface ranking evidence when available instead of inventing a synthetic numeric score
   - If a field is unavailable from the source, mark it clearly as `unknown` instead of omitting it
   - After listing all skills, give a summary recommendation **only if** information completeness level is Full
   - Do not stop at a bare name list when the user asked to search for skills; provide comparison plus a recommendation unless the user explicitly asked for names only

## Installation directory rules

Follow these rules strictly for where to install the skill:

### Global installation
- When the user explicitly mentions "global", "system-wide", or similar words indicating global installation:
  - **macOS/Linux**: `~/.openclaw/skills/`
  - **Windows**: `%USERPROFILE%\.openclaw\skills\`
  - **Other platforms**: Follow the XDG base directory spec if defined, otherwise use `~/.openclaw/skills/`

### Local installation (default)
- When the user does NOT mention "global" or similar words:
  - Install to: `{current_workspace}/skills/`
  - If no workspace is detected, default to `~/.openclaw/workspace/skills/`

## Workflow

### Mode A: Search Only (no installation)

When user only asks to "search", "find", or "look for" a skill (no download/install intent):

1. **Detect search intent** — User asks "find X skill", "search for Y", "is there a skill that can..."
2. **Search all sources simultaneously** — Fire all available search channels in parallel, then aggregate results:
   
   **ClawHub** (primary):
   ```bash
   clawhub search "<query>"
   ```
   
   **GitHub anthropics/skills** (parallel):
   ```bash
   curl -s "https://api.github.com/repos/anthropics/skills/contents/skills?ref=main" \
     | grep -i "<query>"
   ```
   
   **skills.sh** (parallel search only):
   ```bash
   npx skills find "<query>"
   ```
   Note: Install always uses file-based workflow (not `npx skills add`) for directory control.
   
   Aggregate all results into one unified table, with source clearly labeled per skill.
3. **Achieve information completeness** — Attempt `clawhub inspect` for each candidate skill. If inspect fails:
   - Enter degraded mode (see "Search degraded mode" above)
   - Do not proceed to recommendation without user consent
4. **Present results** — Show all results in one unified comparison table. Each row must clearly show which source the skill came from. Include:
   - **Source** (ClawHub / GitHub / skills.sh) — always show this
   - Skill name and owner/repo
   - Short description
   - Source URL
   - Popularity or ranking signals (install count, search score, stars, recency, or source quality) — mark `unknown` if unavailable
   - Best-use-case recommendation for each result
   - A final overall recommendation **only** when all critical fields are available
5. **Disclose information level** — Label the table with its completeness level:
   - Full: "✅ Full details available"
   - Partial: "⚠️ Partial information — some fields marked `unknown`"
   - Minimal: "❌ Limited details — recommend waiting for full data before deciding"
6. **Wait for user** — Ask if they want to install any of the results, or wait for full data
7. **If yes** → Continue to Mode B (Installation)
8. **Done** — End here if user just wants to browse

### Mode B: Installation (review + approved install)

Use the official ClawHub installation workflow for ClawHub-hosted skills whenever the `clawhub` CLI is available. Use the transparent fallback workflow only when the official ClawHub workflow is unavailable or when the source is outside ClawHub.

1. **Capture request**
   - Extract the skill name to download
   - Check if user requested global installation
   - Confirm this is an explicit download request (if not, ask for confirmation)
   - **Check existing installation**:
     - For global installation: check if skill already exists at `~/.openclaw/skills/<skill-name>/`
     - For local installation: check if skill already exists at `{current_workspace}/skills/<skill-name>/`
     - If skill already exists: inform the user the skill is already installed, ask whether they want to **update** it to the latest version, then proceed accordingly

2. **Find the skill**
   - For `clawhub.ai` source: `clawhub search "<name>"` then `clawhub inspect <slug>`
   - For `github.com/anthropics/skills`:
     ```bash
     curl -s "https://raw.githubusercontent.com/anthropics/skills/main/skills/<name>/SKILL.md"
     ```
   - For `skills.sh`: use file-based install (download from the skill's GitHub URL, not `npx skills add`)
   - Search in priority order (ClawHub first). If not found, try GitHub. If still not found, ask for a URL.
   - If multiple matching skills found: organize information (name, description, popularity, source) and recommend → wait for user selection
   - If not found: inform user, suggest alternative sources, wait for user-provided URL

3. **Internal sensitive content check**
   - For the transparent file installation workflow: download to a unique per-run temporary location and do not use symlink-based installation
   - After downloading to a temporary location, automatically read text files to check for suspicious or unsafe content
     - Look for patterns such as unwanted private data collection, destructive commands, hidden execution paths, or suspicious obfuscation
   - If suspicious content is detected: delete the download, inform user of the specific issues, stop
   - If no suspicious content is found: proceed to installation
   - If the official `clawhub` workflow is available for a ClawHub-hosted skill, prefer `clawhub inspect` before `clawhub install`
   - If additional third-party safety tools are available and the user wants extra checks, run them as an extra verification layer after the baseline manual review

4. **Install / Update**
   - If the selected skill is hosted on ClawHub and `clawhub` CLI is available:
     - For inspection: use `clawhub inspect <slug>`
     - For global install: use `clawhub install <slug> --dir ~/.openclaw/skills`
     - For local install: use `clawhub install <slug> --dir {current_workspace}/skills`
     - For updates, prefer the official ClawHub update/install workflow instead of a custom copy-based update flow
   - Otherwise, use the transparent file installation workflow:
     - Create the target directory if it doesn't exist
     - If updating existing skill:
       - Backup old version to target directory with `.bak` suffix (e.g. `skill-name.bak.<timestamp>`)
       - **Preserve skill-generated data**:
         - Keep all non-source files that are not part of the original download (e.g. cached data, user configuration, generated outputs)
         - Only delete/overwrite files that exist in the new downloaded version
         - Do not delete empty directories or directories that contain user data
     - Copy the full source files from temp to target directory (**do NOT use symlinks**)
     - Overwrite only existing source files, leave untouched any additional user/data files
     - Verify the skill structure (ensures SKILL.md exists)
   - If updated: inform user that the update is complete, mention the backup location and that existing user data has been preserved
   - If installed: inform user of successful new installation:
     - Where it was installed
     - How to use it
     - Any additional setup required

5. **Cleanup**
   - Remove the unique per-run temporary working directory and any temporary download files created for that run

6. **Post-installation prompt**
   - After successful installation/update and cleanup, ask the user: "Would you like me to explain the functions and usage of this new skill for you?"
   - If user agrees, read the skill's SKILL.md and summarize the core functions, usage flow and key notes to the user

7. **Done**

## Adding new sources

Users can add new trusted sources by appending to the *Trusted download sources* list above. Maintain the numbered order.## Examples

**Example 1: Full information search (recommended)**
> User: Find me a weather skill
- `clawhub search weather` → results found
- `clawhub inspect weather-skill` → all fields returned
- Present as "✅ Full details available" table with recommendation

**Example 2: Partial information (rate limited)**
> User: Find me a stock skill
- `clawhub search stock` → results found
- `clawhub inspect stock-monitor` → Rate limit exceeded
- Show table with available fields, mark missing as `unknown`
- Label table as "⚠️ Partial information — install count and last updated are unknown"
- Do NOT give recommendation; ask user: "Proceed with partial info, or wait ~30s and retry?"

**Example 3: Global install**
> User: Download the weather skill globally
- Skill name: `weather`
- Install path: `~/.openclaw/skills/weather`
- Run security checks → install

**Example 4: Local install**
> User: Can you install skill-creator in this workspace
- Skill name: `skill-creator`
- Install path: `./skills/skill-creator`
- Run security checks → install

**Example 5: Not found**
> User: Download my-custom-skill
- Not found in default sources → "I couldn't find 'my-custom-skill' in the default trusted sources. Can you provide a download URL?"

**Example 6: Uncertain request**
> User: Where can I find a good markdown processing skill?
- "You can find skills on https://clawhub.ai/, https://skills.sh/, or https://github.com/anthropics/skills. Would you like me to search for and download a markdown processing skill?"