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Implementation Verification Checklist

Purpose: Verify that implementation is complete, correct, and meets all acceptance criteria
Type: Implementation Verification
Created: 2025-02-17
Feature: F15 Speculative Router
Last Updated: 2025-02-17

NOTE: F15 was implemented as part of Phase 2.5 and merged in PR #178. This is a retrospective verification of existing code — TDD history items are marked [-] (N/A) since the spec was written after the implementation.

Section 1: Acceptance Criteria Verification

AC Completion Status

  • VER-001: All 54 acceptance criteria checkboxes in tasks.md are checked [x]
  • VER-002: Each checked criterion has corresponding passing test(s)
  • VER-003: No acceptance criteria were skipped or marked as "won't fix"
  • VER-004: All 5 user stories implemented (US1-US5)

AC Traceability

  • VER-005: Each acceptance criterion maps to at least one test case
  • VER-006: Test names reference user story areas (extracts_model_name, detects_vision_requirement, etc.)
  • VER-007: Test output confirms which AC is being verified
  • [-] VER-008: No failed/skipped tests to investigate

Section 2: Test-Driven Development Compliance

TDD Workflow Verification

  • [-] VER-009: N/A — retrospective spec of existing implementation (merged in PR #178)
  • [-] VER-010: N/A — retrospective documentation, no RED/GREEN history to verify
  • [-] VER-011: N/A — tests and implementation landed together
  • [-] VER-012: N/A — retrospective documentation
  • [-] VER-013: N/A — retrospective documentation

Test Coverage & Quality

  • VER-014: Public functions have unit tests (requirements.rs: 6 tests, request_analyzer.rs: 5 tests, mod.rs: 7 filter tests)
  • [-] VER-015: N/A — F15 is internal routing logic, no new API endpoints added
  • [-] VER-016: Property-based tests — N/A for F15; scoring proptest covered by base router
  • VER-017: cargo test passes with 0 failures (1053 tests, 3 ignored)
  • VER-018: Test execution time reasonable (~66s full suite)
  • VER-019: Tests are deterministic

Test Types Coverage

  • [-] VER-020: Contract tests — N/A, F15 adds no new API surface
  • [-] VER-021: Integration tests — N/A, F15 is internal routing logic (tested via unit tests)
  • VER-022: Unit tests cover requirements extraction (6 tests), alias resolution (5 tests), capability filtering (7 tests)
  • [-] VER-023: Property-based tests — covered by base router scoring tests
  • [-] VER-024: Concurrent access tests — N/A, RequestRequirements is constructed per-request (no shared mutable state)
  • VER-025: Error handling tests cover empty candidates, unknown models, no false positives

Section 3: Constitutional Compliance Verification

Simplicity Gate Verification

  • VER-026: Uses existing modules (routing/requirements.rs, routing/reconciler/request_analyzer.rs, routing/mod.rs) — no new top-level modules
  • VER-027: No speculative features beyond spec
  • VER-028: No premature optimization — chars/4 heuristic is simplest viable approach
  • VER-029: Simplest approach: single-pass message scan, direct field checks

Anti-Abstraction Gate Verification

  • VER-030: Axum routes used directly
  • VER-031: Tokio primitives used directly
  • VER-032: reqwest client used directly
  • VER-033: Single representation — RequestRequirements is the only requirements type
  • VER-034: No framework-on-framework patterns
  • VER-035: Reconciler trait reused from existing pipeline, justified by pipeline pattern

Integration-First Gate Verification

  • VER-036: Capability filtering integrated into existing Router::filter_candidates()
  • VER-037: Unit tests verify end-to-end flow from request → requirements → filtering → candidate selection
  • VER-038: Cross-module integration tested (RequestRequirements ↔ Router ↔ Registry)
  • VER-039: OpenAI format maintained — request inspection is read-only (Principle III)

Performance Gate Verification

  • VER-040: Routing decision < 1ms (bench_full_pipeline: ~800ns mean, ~1.2ms P95 with 25 backends)
  • VER-041: Total overhead < 5ms (request analysis ~200ns + pipeline ~800ns)
  • [-] VER-042: Memory baseline — N/A, no new startup allocations
  • [-] VER-043: Memory per backend — N/A, negligible overhead (6 fields on existing struct)
  • VER-044: Performance benchmarks pass (benches/routing.rs: 4 F15-specific benchmarks)

Section 4: Code Quality Verification

Rust Standards

  • VER-045: cargo build — 0 errors, 0 warnings
  • VER-046: cargo clippy --all-targets -- -D warnings — 0 warnings
  • VER-047: cargo fmt --all -- --check — passes
  • VER-048: No unsafe blocks
  • VER-049: No unwrap() in production code paths (from_request uses unwrap_or, and_then chains)
  • VER-050: No unresolved TODO/FIXME

Code Structure & Documentation

  • VER-051: Public types have doc comments (RequestRequirements, RequestAnalyzer, all fields)
  • VER-052: Public functions have doc comments (from_request, new, reconcile)
  • VER-053: Error conditions documented (empty candidates logged at debug level)
  • VER-054: Module-level documentation exists (//! in requirements.rs and request_analyzer.rs)
  • VER-055: Naming conventions followed (RequestRequirements, from_request, MAX_ALIAS_DEPTH)
  • VER-056: Line width ≤ 100 characters

Logging & Error Handling

  • VER-057: No println! statements in F15 code
  • VER-058: Appropriate log levels (debug for alias resolution and candidate population)
  • VER-059: Structured logging with context fields (model, candidates count, from/to/depth for aliases)
  • VER-060: Errors use RoutingError via thiserror
  • [-] VER-061: N/A — F15 adds no new HTTP endpoints
  • VER-062: No panics on expected error conditions

Section 5: Functional Correctness Verification

Functional Requirements (FR) Verification

  • VER-063: All 15 FRs implemented (FR-001 through FR-015)
  • VER-064: Each FR has at least one test (vision: detects_vision_requirement, tokens: estimates_tokens_from_content, tools: detects_tools_requirement, json: detects_json_mode_requirement, filtering: filters_by_vision/tools/json_mode/context_length)
  • VER-065: Code review confirms FR implementation matches expected behavior
  • VER-066: Edge cases tested (empty messages, no special requirements, multiple capabilities)

User Stories Verification

  • VER-067: All 5 user stories implemented (US1: Vision, US2: Context, US3: Tools, US4: JSON, US5: Streaming)
  • VER-068: Each user story has passing unit tests
  • [-] VER-069: N/A — internal routing, not manually testable via external workflow
  • VER-070: Priority order respected (P1: US1/US2, P2: US3, P3: US4/US5)

API Contracts Verification

  • [-] VER-071 through VER-075: N/A — F15 adds no new API endpoints; it is internal routing logic

Section 6: Non-Functional Requirements Verification

Performance Requirements

  • VER-076: Latency targets met (RequestAnalyzer: ~200ns mean, full pipeline: ~800ns mean)
  • [-] VER-077: N/A — no new throughput requirements
  • [-] VER-078: N/A — no new resource limits
  • [-] VER-079: N/A — no load testing changes

Concurrency & Thread Safety

  • VER-080: Shared state properly synchronized (Registry uses DashMap, read-only access in filter_candidates)
  • VER-081: Read operations don't block (DashMap read access)
  • [-] VER-082: N/A — RequestRequirements is per-request, no shared mutable state
  • VER-083: No data races (all tests pass under concurrent test runner)
  • [-] VER-084: N/A — no new counters added by F15

Reliability & Resilience

  • VER-085: Graceful degradation (empty candidates → logged and handled, no crash)
  • [-] VER-086: N/A — health checks unchanged
  • [-] VER-087: N/A — timeouts unchanged
  • VER-088: No crashes on malformed content parts or missing fields

Resource Limits

  • [-] VER-090: N/A — no significant memory changes
  • [-] VER-091: N/A — minimal per-backend overhead (6 fields on RequestRequirements)
  • [-] VER-092: N/A — binary size unchanged
  • VER-093: No unbounded data structures (alias depth capped at MAX_ALIAS_DEPTH=3)

Section 7: Edge Cases & Error Handling Verification

Edge Cases from Spec

  • VER-094: Edge cases implemented (empty messages, mixed content, alias depth limit, context boundary)
  • VER-095: Edge cases tested (simple_request_has_no_special_requirements, empty_candidates_for_unknown_model, resolves_chained_aliases_max_3)
  • VER-096: Edge case behavior matches spec

Error Scenarios

  • VER-097: All error conditions return proper responses (RoutingError, no panics)
  • VER-098: Error context includes model name and candidate count in debug logs
  • VER-099: Error types are specific (RoutingError via thiserror)
  • [-] VER-100: N/A — F15 doesn't add new HTTP error paths

Boundary Conditions

  • VER-101: Empty inputs handled (empty messages → 0 tokens, empty candidates → graceful)
  • VER-102: Maximum values handled (alias depth capped at 3, token estimation handles large inputs)
  • VER-103: None values handled (optional fields via unwrap_or, and_then chains)
  • [-] VER-104: N/A — no new string parsing for config

Concurrent Access Edge Cases

  • [-] VER-105: N/A — no concurrent add/remove in F15
  • [-] VER-106: N/A — no new model mutations
  • [-] VER-107: N/A — no new counters
  • [-] VER-108: N/A — no counter changes

Section 8: Integration & Dependencies Verification

Feature Dependencies

  • VER-109: Depends on Registry (model metadata), Router (select_backend), Reconciler pipeline — all available
  • VER-110: Integration points tested (RequestAnalyzer in pipeline, filter_candidates in Router)
  • VER-111: No new external crate dependencies
  • VER-112: No circular dependencies

Registry Integration

  • VER-113: Backend registration with capability flags (supports_vision, supports_tools, supports_json_mode, context_length) works
  • VER-114: get_backends_for_model returns correct results for candidate population
  • VER-115: Health status reflected in filter_candidates (unhealthy backends excluded)
  • [-] VER-116: N/A — no pending request changes in F15

Router Integration

  • VER-117: Backend selection respects capability requirements (7 filter tests in mod.rs)
  • VER-118: Fallback chains work with capability filtering
  • VER-119: Fallback chains respected (bench_routing_with_fallback validates)
  • VER-120: Model aliases resolved correctly (max 3 levels, 5 unit tests in request_analyzer.rs)

Section 9: Configuration & CLI Verification

Configuration File

  • [-] VER-121 through VER-125: N/A — F15 adds no new configuration options; capability flags are auto-detected from backends

CLI Commands

  • [-] VER-126 through VER-130: N/A — no new CLI commands in F15

Environment Variables

  • [-] VER-131 through VER-133: N/A — no new env vars

Section 10: Security & Safety Verification

Memory Safety

  • VER-134: No buffer overflows (Rust ownership model enforced)
  • VER-135: No use-after-free (no unsafe blocks)
  • VER-136: No unsafe blocks in F15 code

Input Validation

  • VER-137: Request content parts validated (type field checked, missing text handled via Option)
  • [-] VER-138: N/A — no new JSON parsing endpoints
  • [-] VER-139: N/A
  • [-] VER-140: N/A

Secrets & Privacy

  • VER-141: No secrets in logs (only model names and candidate counts logged)
  • VER-142: No telemetry or external calls (zero network calls for routing decisions)
  • [-] VER-143: N/A — no new auth

Section 11: Documentation Verification

Code Documentation

  • [-] VER-144: N/A — F15 is internal routing, not user-facing
  • [-] VER-145: N/A — no architecture change (extends existing routing pipeline)
  • [-] VER-146: N/A — F15 already listed in docs/FEATURES.md
  • [-] VER-147: N/A — no new config options

Spec Documentation

  • VER-148: Spec status set to "Implemented" in spec.md
  • VER-149: All 54 tasks in tasks.md checked [x]
  • VER-150: PR #178 referenced (implementation merged)
  • [-] VER-151: No deviations from spec

Section 12: CI/CD & Deployment Verification

CI Pipeline

  • VER-152: All CI checks pass (tests, clippy, fmt)
  • VER-153: No warnings (clippy clean)
  • VER-154: CI runs all test types
  • VER-155: CI timeout reasonable

Build & Release

  • VER-156: Binary builds for all platforms
  • [-] VER-157: Binary size not independently measured for F15
  • VER-158: Single binary, no new runtime deps
  • [-] VER-159: N/A — release notes handled at version level

Git & PR Hygiene

  • VER-160: Feature merged to main via PR #178
  • VER-161: Conventional commits used
  • VER-162: PR linked to implementation
  • VER-163: No merge conflicts (already merged)
  • [-] VER-164: N/A — solo development

Section 13: Manual Testing & Smoke Tests

Smoke Test Scenarios

  • [-] VER-165 through VER-176: N/A — system-level smoke tests unchanged by F15 (internal routing logic)

Error Scenario Testing

  • [-] VER-177: N/A — no new model endpoint behavior
  • [-] VER-178: N/A — no timeout changes
  • [-] VER-179: N/A — no new 503 paths
  • [-] VER-180: N/A — no request parsing changes

Section 14: Compatibility Verification

  • [-] VER-181 through VER-188: N/A — backward compatible, no breaking changes (internal routing enhancement)

Section 15: Regression Testing

  • VER-189: All 1053 existing tests pass (0 failures)
  • VER-190: No new warnings (clippy clean)
  • VER-191: Performance not degraded (benchmarks validate < 1ms routing with 25 backends)
  • VER-192: All existing tests pass after F15 implementation

Section 16: Final Checklist & Sign-Off

Implementation Complete Checklist

  • VER-193: All 54 acceptance criteria checked in tasks.md
  • VER-194: All 1053 tests pass (cargo test)
  • VER-195: Clippy clean
  • VER-196: Fmt clean
  • [-] VER-197: N/A — internal routing, no manual smoke test needed
  • VER-198: Retrospective spec documentation complete (spec.md, plan.md, tasks.md)
  • VER-199: No known bugs remain
  • VER-200: Already merged to main (PR #178)

Constitutional Compliance Final Check

  • VER-201: Zero config — capability detection is automatic from request content
  • VER-202: Single binary — no new runtime dependencies
  • VER-203: OpenAI-compatible — request inspection is read-only (Principle III)
  • VER-204: Backend agnostic — capability filtering by model flags, not backend type
  • VER-205: Intelligent routing — capabilities checked first, then load/latency (Principle V)
  • VER-206: Resilient — empty candidates handled gracefully, no panics
  • VER-207: Local-first — zero network calls, zero ML inference for routing decisions

Sign-Off

  • VER-208: Author sign-off — implementation meets all requirements

Summary

Category Pass N/A Total
Acceptance Criteria 7 1 8
TDD Compliance 6 11 17
Constitutional 17 2 19
Code Quality 17 1 18
Functional 7 2 9
Non-Functional 7 10 17
Edge Cases 9 6 15
Integration 11 1 12
Config & CLI 0 3 3
Security 6 4 10
Documentation 3 5 8
CI/CD 10 3 13
Smoke Tests 0 5 5
Compatibility 0 1 1
Regression 4 0 4
Final 15 1 16
Total 119 56 175

References

  • Implementation PR: #178 (merged)
  • Core Files: src/routing/requirements.rs, src/routing/reconciler/request_analyzer.rs, src/routing/mod.rs
  • Benchmarks: benches/routing.rs
  • Spec: specs/018-speculative-router/spec.md
  • Tasks: specs/018-speculative-router/tasks.md
  • Nexus Constitution: .specify/memory/constitution.md