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# Implementation Summary

**Session ID**: `phase40-session09-model-intelligence-and-pricing` **Completed**: 2026-07-03 **Duration**: 1.5 hours

***

## Overview

Session 09 added the Hermes-scoped Ministry model intelligence and pricing contract for Phase 40. The implementation keeps model rows, bundled pricing, optional keyless local OpenRouter pricing, browser parsing, ranking helpers, demo fixtures, hook exposure, and pricing provenance inside existing Hermes owners without adding a repo-level model-intelligence data file.

***

## Deliverables

### Files Created

| File                                                      | Purpose                                                                                                         | Lines |
| --------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------- | ----- |
| `scripts/lib/hermes-model-intelligence.ts`                | Script-side Ministry rows, bundled pricing, OpenRouter parser, live overlay, cache, and fallback body assembly. | \~624 |
| `scripts/lib/__tests__/hermes-model-intelligence.test.ts` | Script-side coverage for lineup, parser, fallback, cache, and sanitized output.                                 | \~199 |
| `src/lib/hermes-model-intelligence.ts`                    | Browser ranking helpers for benchmark, cost, and speed with deterministic missing-metric fallback.              | \~66  |
| `src/lib/__tests__/hermes-model-intelligence.test.ts`     | Browser ranking coverage for stable ordering and missing-metric fallback behavior.                              | \~117 |

### Files Modified

| File                                                       | Changes                                                                                                       |
| ---------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- |
| `scripts/lib/hermes-dev-bridge.ts`                         | Added `/__hermes_model_intelligence` as a public local Hermes read backed by the model-intelligence resolver. |
| `scripts/lib/__tests__/hermes-dev-bridge.test.ts`          | Added bridge endpoint, fallback, live-pricing, and no-leak coverage.                                          |
| `src/lib/hermes-types.ts`                                  | Added browser-safe model intelligence, pricing provenance, ranking, live-summary, and parser contracts.       |
| `src/lib/__tests__/hermes-types.test.ts`                   | Added parser and demo fixture alignment coverage.                                                             |
| `src/lib/hermes-demo-data.ts`                              | Added bundled snapshot model-intelligence fixture with live pricing disabled.                                 |
| `src/hooks/use-hermes.ts`                                  | Exposed model intelligence through React Query with explicit query states and demo gating.                    |
| `src/hooks/__tests__/use-hermes.test.tsx`                  | Added hook coverage for fetch, no-token reads, demo-disabled live pricing, and error states.                  |
| `src/components/hermes/hermes-read-only-page.tsx`          | Threaded model intelligence through existing Hermes demo/live data plumbing.                                  |
| `src/components/hermes/hermes-status-bar.tsx`              | Added product-facing Ministry pricing provenance copy based on row-level evidence.                            |
| `src/components/hermes/__tests__/hermes-sections.test.tsx` | Updated Hermes section mocks and fixture expectations for the expanded hook result.                           |

***

## Technical Decisions

1. **Keep the contract Hermes-scoped**: The Phase 40 stub explicitly excluded a repo-level `src/data/model-intel.json`, so the durable rows and pricing logic live in Hermes bridge, parser, hook, fixture, and helper owners.
2. **Treat live pricing as opportunistic**: Local OpenRouter pricing is keyless, timeout-bounded, cached for 30 minutes, and always falls back to bundled snapshot pricing with explicit provenance.
3. **Keep benchmark metrics static**: Ranking uses bundled benchmark and speed metrics only, so the UI never claims live benchmark data.
4. **Use parser-owned browser contracts**: Components and hooks consume validated model-intelligence shapes instead of raw bridge payloads.

***

## Test Results

| Metric               | Value         |
| -------------------- | ------------- |
| Tests                | 4,737         |
| Passed               | 4,737         |
| Focused Hermes Tests | 147/147       |
| Coverage             | Not collected |

***

## Lessons Learned

1. Row-level pricing provenance is required because partial OpenRouter overlays can mix live and bundled snapshot prices in one response.
2. Public demo mode needs fixture-first data ownership so adding local live reads does not accidentally introduce hosted fetch behavior.
3. Targeted formatter checks are still useful while older out-of-scope `.spec_system` Markdown files remain globally unformatted.

***

## Future Considerations

Items for future sessions:

1. Session 10 should preserve the same public-demo and media-policy boundaries when adding assets and media compliance updates.
2. Sessions 14 and 15 can consume the model-intelligence ranking and pricing contracts for Ministry and Pantheon UX without rebuilding the data layer.
3. Documentation should describe live pricing as optional local OpenRouter pricing only after the matching user-facing behavior is shipped.

***

## Session Statistics

* **Tasks**: 20 completed
* **Files Created**: 4 implementation/test files plus 7 session closeout artifacts
* **Files Modified**: 10 implementation/test files plus 5 tracking, version, and documentation files
* **Tests Added**: 4 focused test files plus extensions to bridge, parser, hook, and component tests
* **Blockers**: 0 resolved


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