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feat(FN-1048): add configurable agent prompts with built-in templates

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- Add AgentPromptTemplate and AgentPromptsConfig types to ProjectSettings
- Create agent-prompts module with 7 built-in prompt templates and role resolver
- Wire engine agents (executor, reviewer, merger, triage) to use resolved prompts
- Add 25 test cases covering template resolution, role assignment, and validation
- Export new types from @fusion/core package
- Document agentPrompts configuration and built-in templates in AGENTS.md
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gsxdsm
2026-04-07 12:31:28 -07:00
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AGENTS.md
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@@ -1090,6 +1090,56 @@ The dashboard Settings modal includes a "Backups" section where you can:
- View current backup count and total size
- Create manual backups with the "Backup Now" button
### `agentPrompts` (default: `undefined`)
Configurable agent role prompt templates and assignments. When set, allows per-project customization of system prompts for different agent roles (executor, triage, reviewer, merger).
**Configuration:**
```json
{
"settings": {
"agentPrompts": {
"templates": [
{
"id": "my-custom-executor",
"name": "My Custom Executor",
"description": "A custom executor with specific behavioral guidelines",
"role": "executor",
"prompt": "You are a custom task execution agent..."
}
],
"roleAssignments": {
"executor": "my-custom-executor",
"reviewer": "strict-reviewer"
}
}
}
}
```
**Built-in Templates:**
| Template ID | Role | Description |
|-------------|------|-------------|
| `default-executor` | executor | Standard task execution agent with full tooling and review support |
| `default-triage` | triage | Standard task specification agent producing detailed PROMPT.md files |
| `default-reviewer` | reviewer | Standard independent code and plan reviewer with balanced criteria |
| `default-merger` | merger | Standard merge agent for squash merges with conflict resolution |
| `senior-engineer` | executor | Autonomous executor with architectural awareness, performance focus, and minimal hand-holding |
| `strict-reviewer` | reviewer | Rigorous reviewer with stricter criteria for security, edge cases, backward compatibility, and type safety |
| `concise-triage` | triage | Shorter, more focused specification format with minimal prose |
**How It Works:**
- Set `roleAssignments` to map an agent role to a template ID (built-in or custom)
- Custom templates can override built-in templates by using the same ID
- When no assignment is configured for a role, the default built-in prompt is used (identical to pre-feature behavior)
- The merger prompt is used as a base — commit format instructions and build verification steps are always appended dynamically
**Notes:**
- Workflow step prompts and child agent prompts are NOT affected by this configuration (they are context-specific)
- The built-in prompt texts are derived from the engine's hardcoded prompts and should be kept in sync
- When `agentPrompts` is `undefined` (default), behavior is identical to before this feature existed
## Model Presets
The kb dashboard supports reusable model presets so teams can standardize AI model choices without manually selecting executor and validator models for every task.