# Verification Report: Deep Research Modes
**Spec:** `2026-01-11-deep-research-modes`
**Date:** 2026-01-11
**Verifier:** implementation-verifier
**Status:** Passed
---
## Executive Summary
The Deep Research Modes feature has been fully implemented and verified. All 22 tasks across 5 task groups are complete. The implementation adds a `model` parameter supporting four Perplexity Sonar tiers with model-specific timeouts, cost tier metadata, and backwards-compatible defaults. All 656 tests pass (637 unit + 19 integration), including 17 tests specifically for the Deep Research Modes feature.
---
## 1. Tasks Verification
**Status:** All Complete
### Completed Tasks
- [x] Task Group 1: Core Types and Model Configuration
- [x] 1.1 Write 4-6 focused tests for model types and constants
- [x] 1.2 Extend `PerplexityModelId` type in `src/types/openrouter.ts`
- [x] 1.3 Create model constants file `src/constants/models.ts`
- [x] 1.4 Add `costTier` and `timeout` fields to `SearchMetadata` interface
- [x] 1.5 Ensure type definition tests pass
- [x] Task Group 2: Input Validation and Schema Updates
- [x] 2.1 Write 4-6 focused tests for schema validation
- [x] 2.2 Update `SUPPORTED_MODELS` array in `src/schemas/search.ts`
- [x] 2.3 Update model enum in `SearchToolInputSchema`
- [x] 2.4 Add `timeout` parameter to `SearchToolInputSchema`
- [x] 2.5 Enhance validation error messages
- [x] 2.6 Ensure schema validation tests pass
- [x] Task Group 3: Search Tool and Client Integration
- [x] 3.1 Write 6-8 focused tests for search tool behavior
- [x] 3.2 Add model name resolution in `SearchTool.search()` method
- [x] 3.3 Implement model-specific timeout logic
- [x] 3.4 Update `performActualSearch()` to handle dynamic timeouts
- [x] 3.5 Enhance response metadata in `formatSearchResponseWithMetrics()`
- [x] 3.6 Update response formatting in `src/index.ts` CallToolRequestSchema handler
- [x] 3.7 Ensure search tool tests pass
- [x] Task Group 4: MCP Tool Schema and Documentation Updates
- [x] 4.1 Write 2-4 focused integration tests
- [x] 4.2 Update search tool inputSchema in `src/index.ts`
- [x] 4.3 Update search tool description
- [x] 4.4 Ensure integration tests pass
- [x] Task Group 5: Test Review and Critical Gap Coverage
- [x] 5.1 Review tests from Task Groups 1-4
- [x] 5.2 Analyze test coverage gaps for Deep Research Modes feature only
- [x] 5.3 Write up to 6 additional strategic tests maximum (if needed)
- [x] 5.4 Run feature-specific tests only
### Incomplete or Issues
None - all tasks completed successfully.
---
## 2. Documentation Verification
**Status:** Complete
### Implementation Files Modified
| File | Changes |
| --------------------------------- | ----------------------------------------------------------- |
| `src/constants/models.ts` | New file with model mappings, timeouts, cost tiers |
| `src/types/openrouter.ts` | Extended `PerplexityModelId` to union type with 4 models |
| `src/types/search.ts` | Added `costTier` and `timeout` to `SearchMetadata` |
| `src/schemas/search.ts` | Updated model enum, added timeout parameter with validation |
| `src/tools/search.ts` | Model resolution, timeout logic, metadata propagation |
| `src/index.ts` | Updated tool schema and description |
| `src/utils/response-optimizer.ts` | Added `ResponseMetadataOptions` for costTier/timeout |
### Test Files Created/Modified
| File | Tests |
| ----------------------------------------------- | ------------------------------------- |
| `tests/unit/constants/models.test.ts` | 7 tests for model constants |
| `tests/unit/schemas/search.test.ts` | 31 tests (includes schema validation) |
| `tests/unit/tools/search.test.ts` | 26 tests (includes search behavior) |
| `tests/unit/tools/search-deep-research.test.ts` | 17 tests for Deep Research feature |
| `tests/integration/search-tool.test.ts` | 12 tests (includes integration tests) |
### Missing Documentation
None - all code is documented with JSDoc comments and descriptive parameter descriptions.
---
## 3. Roadmap Updates
**Status:** Updated
### Updated Roadmap Items
- [x] Deep Research Modes - Add `model` parameter to search tool supporting all four Perplexity Sonar tiers (sonar, sonar-pro, sonar-reasoning-pro, sonar-deep-research) with model-specific timeouts, cost notes in metadata, and backwards-compatible defaults.
### Notes
The roadmap at `agent-os/product/roadmap.md` has been updated to mark the Deep Research Modes feature (Phase 1, Item 1) as complete.
---
## 4. Test Suite Results
**Status:** All Passing
### Test Summary
- **Total Tests:** 656
- **Passing:** 656
- **Failing:** 0
- **Errors:** 0
- **Skipped:** 1 (unrelated live API test)
### Test Breakdown
**Unit Tests:** 637 passed (1 skipped)
- `tests/unit/constants/models.test.ts` - 7 tests
- `tests/unit/schemas/search.test.ts` - 31 tests
- `tests/unit/tools/search.test.ts` - 26 tests
- `tests/unit/tools/search-deep-research.test.ts` - 17 tests
- Plus 25 other test files covering existing functionality
**Integration Tests:** 19 passed
- `tests/integration/search-tool.test.ts` - 12 tests (includes Deep Research integration)
- `tests/integration/mcp-server.test.ts` - 3 tests
- `tests/integration/mock-integration.test.ts` - 3 tests
- `tests/integration/sample.test.ts` - 1 test
### Failed Tests
None - all tests passing.
### Notes
- TypeScript compilation passes without errors
- All feature-specific tests verify:
- Model parameter accepts all four values (sonar, sonar-pro, sonar-reasoning-pro, sonar-deep-research)
- Model-specific default timeouts are applied correctly (30s, 60s, 120s, 300s)
- Timeout override parameter works as expected (5000-600000ms bounds)
- Cost tier metadata is included for premium models
- Invalid model values produce helpful error messages listing valid options
- Backwards compatibility maintained (defaults to sonar when not specified)
---
## 5. Implementation Verification Summary
### Spec Requirements Checklist
| Requirement | Status | Evidence |
| ------------------------------- | ------ | ------------------------------------------------------------------------- |
| `model` parameter with 4 values | Passed | Schema accepts sonar, sonar-pro, sonar-reasoning-pro, sonar-deep-research |
| User-friendly name mapping | Passed | `PERPLEXITY_MODELS` maps to OpenRouter identifiers |
| Default to `sonar` | Passed | Schema default and tests verify backwards compatibility |
| Model-specific timeouts | Passed | `MODEL_TIMEOUTS` constant with 30s/60s/120s/300s |
| Timeout override parameter | Passed | Optional timeout with 5000-600000ms validation |
| Helpful error messages | Passed | Invalid model lists all valid options |
| Cost tier metadata | Passed | `costTier` field in response for premium models |
| Response metadata enhancement | Passed | `model`, `timeout`, `costTier` in metadata |
| Tool description update | Passed | Documents model options and use cases |
### Key Implementation Files
- `/Users/awallis/dev/nexus-mcp/src/constants/models.ts` - Model constants and mappings
- `/Users/awallis/dev/nexus-mcp/src/schemas/search.ts` - Input validation with model enum
- `/Users/awallis/dev/nexus-mcp/src/tools/search.ts` - Core search implementation
- `/Users/awallis/dev/nexus-mcp/src/index.ts` - MCP tool registration
---
## Conclusion
The Deep Research Modes feature has been successfully implemented and verified. All spec requirements are met, all tests pass, and the implementation maintains backwards compatibility with existing search functionality. The feature enables users to select between fast Q&A (sonar) and exhaustive deep research (sonar-deep-research) with appropriate timeout handling and cost awareness.
