list-agent-tools
List available tools for custom agent configuration. Use as reference when defining agent tool access.
What this skill does
# List Agent Tools
List available tools for custom agent configuration.
## Instructions
Display the default Claude Code tools and guidance for tool access configuration.
## Output
```markdown
## Claude Code Default Tools
### File Operations
| Tool | Purpose | Common Use |
| --- | --- | --- |
| `Read` | Read file contents | Codebase exploration |
| `Write` | Write new files | File creation |
| `Edit` | Edit existing files | Code modification |
| `Glob` | Find files by pattern | File discovery |
| `Grep` | Search file contents | Code search |
### Execution
| Tool | Purpose | Common Use |
| --- | --- | --- |
| `Bash` | Execute shell commands | Build, test, deploy |
### Web
| Tool | Purpose | Common Use |
| --- | --- | --- |
| `WebFetch` | Fetch web content | Documentation |
| `WebSearch` | Search the web | Research |
### Agent
| Tool | Purpose | Common Use |
| --- | --- | --- |
| `Task` | Spawn subagents | Parallel work |
| `TodoWrite` | Track tasks | Progress tracking |
---
## Tool Access Configuration
### Whitelist (allowed_tools)
Use when agent needs only specific tools:
```python
allowed_tools=["Read", "Write", "Bash"]
```
### Blacklist (disallowed_tools)
Use when agent needs most tools except some:
```python
disallowed_tools=["WebFetch", "WebSearch", "Task"]
```
### Disable All Default Tools
For agents with only custom tools:
```python
disallowed_tools=["*"]
```
### Custom Tools
Add via MCP server:
```python
mcp_servers={"my_server": my_mcp_server}
allowed_tools=["mcp__my_server__my_tool"]
```
Tool naming: `mcp__<server>__<tool>`
---
## Tool Access Patterns
### Minimal Agent
For focused, single-purpose agents:
```python
allowed_tools=["Read"] # Read-only exploration
```
### Code Agent
For agents that modify code:
```python
allowed_tools=["Read", "Write", "Edit", "Glob", "Grep", "Bash"]
```
### Research Agent
For agents that gather information:
```python
allowed_tools=["Read", "Glob", "Grep", "WebFetch", "WebSearch"]
```
### Pure Custom Tools
For agents with only custom functionality:
```python
mcp_servers={"domain": domain_server}
allowed_tools=["mcp__domain__tool1", "mcp__domain__tool2"]
disallowed_tools=["*"]
```
### Parallel Agent
For agents that spawn subagents:
```python
allowed_tools=["Task", "Read", "Glob", "Grep"]
```
---
## Token Overhead Warning
> "15 extra tools consume space in your agent's mind."
Each tool definition consumes context window space even if never used. Strip unnecessary tools for:
- Better context utilization
- Reduced confusion
- Clearer agent focus
---
## Related Commands
- `/create-agent` - Scaffold new custom agent
- `/create-tool` - Generate custom tool boilerplate
## Related Skills
- @custom-agent-design - Agent design workflow
- @tool-design - Tool creation workflow
## Related Memory
- @core-four-custom.md - Tools in Core Four
- @custom-tool-patterns.md - Tool patterns
## Notes
- Use /context command to understand tool overhead
- Strip tools your agent doesn't need
- Custom tools require ClaudeSDKClient (not query())
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