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docs: map custom_instructions to --append-system-prompt (#1480) #1484

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47 changes: 24 additions & 23 deletions docs/migration-guide.md
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Expand Up @@ -14,19 +14,19 @@ This guide helps you migrate from Claude Code Action v0.x to v1.0. The new versi

The following inputs have been deprecated and replaced:

| Deprecated Input | Replacement | Notes |
| --------------------- | ------------------------------------ | --------------------------------------------- |
| `mode` | Auto-detected | Action automatically chooses based on context |
| `direct_prompt` | `prompt` | Direct drop-in replacement |
| `override_prompt` | `prompt` | Use GitHub context variables instead |
| `custom_instructions` | `claude_args: --system-prompt` | Move to CLI arguments |
| `max_turns` | `claude_args: --max-turns` | Use CLI format |
| `model` | `claude_args: --model` | Specify via CLI |
| `allowed_tools` | `claude_args: --allowedTools` | Use CLI format |
| `disallowed_tools` | `claude_args: --disallowedTools` | Use CLI format |
| `claude_env` | `settings` with env object | Use settings JSON |
| `mcp_config` | `claude_args: --mcp-config` | Pass MCP config via CLI arguments |
| `timeout_minutes` | Use GitHub Actions `timeout-minutes` | Configure at job level instead of input level |
| Deprecated Input | Replacement | Notes |
| --------------------- | ------------------------------------- | ----------------------------------------------------------------------------------- |
| `mode` | Auto-detected | Action automatically chooses based on context |
| `direct_prompt` | `prompt` | Direct drop-in replacement |
| `override_prompt` | `prompt` | Use GitHub context variables instead |
| `custom_instructions` | `claude_args: --append-system-prompt` | Appends to the default prompt (v0 behavior); `--system-prompt` replaces it entirely |
| `max_turns` | `claude_args: --max-turns` | Use CLI format |
| `model` | `claude_args: --model` | Specify via CLI |
| `allowed_tools` | `claude_args: --allowedTools` | Use CLI format |
| `disallowed_tools` | `claude_args: --disallowedTools` | Use CLI format |
| `claude_env` | `settings` with env object | Use settings JSON |
| `mcp_config` | `claude_args: --mcp-config` | Pass MCP config via CLI arguments |
| `timeout_minutes` | Use GitHub Actions `timeout-minutes` | Configure at job level instead of input level |

## Migration Examples

Expand All @@ -52,7 +52,7 @@ The following inputs have been deprecated and replaced:
anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
claude_args: |
--max-turns 10
--system-prompt "Follow our coding standards"
--append-system-prompt "Follow our coding standards"
--allowedTools Edit,Read,Write
```

Expand Down Expand Up @@ -255,14 +255,15 @@ claude_args: |

### Common claude_args Options

| Option | Description | Example |
| ------------------- | ------------------------ | -------------------------------------- |
| `--max-turns` | Limit conversation turns | `--max-turns 10` |
| `--model` | Specify Claude model | `--model claude-4-0-sonnet-20250805` |
| `--allowedTools` | Enable specific tools | `--allowedTools Edit,Read,Write` |
| `--disallowedTools` | Disable specific tools | `--disallowedTools WebSearch` |
| `--system-prompt` | Add system instructions | `--system-prompt "Focus on security"` |
| `--mcp-config` | Add MCP server config | `--mcp-config '{"mcpServers": {...}}'` |
| Option | Description | Example |
| ------------------------ | ------------------------------------------------------------------------- | ------------------------------------------------------ |
| `--max-turns` | Limit conversation turns | `--max-turns 10` |
| `--model` | Specify Claude model | `--model claude-4-0-sonnet-20250805` |
| `--allowedTools` | Enable specific tools | `--allowedTools Edit,Read,Write` |
| `--disallowedTools` | Disable specific tools | `--disallowedTools WebSearch` |
| `--system-prompt` | Replace the entire default system prompt | `--system-prompt "Focus on security"` |
| `--append-system-prompt` | Append to the default system prompt (keeps Claude Code's built-in prompt) | `--append-system-prompt "Follow our coding standards"` |
| `--mcp-config` | Add MCP server config | `--mcp-config '{"mcpServers": {...}}'` |

## Provider-Specific Updates

Expand Down Expand Up @@ -330,7 +331,7 @@ You can also pass MCP configuration from a file:
- [ ] Remove `mode` input (auto-detected now)
- [ ] Replace `direct_prompt` with `prompt`
- [ ] Replace `override_prompt` with `prompt` using GitHub context
- [ ] Move `custom_instructions` to `claude_args` with `--system-prompt`
- [ ] Move `custom_instructions` to `claude_args` with `--append-system-prompt`
- [ ] Convert `max_turns` to `claude_args` with `--max-turns`
- [ ] Convert `model` to `claude_args` with `--model`
- [ ] Convert `allowed_tools` to `claude_args` with `--allowedTools`
Expand Down