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feat(spike): SP-01 Gemini structured output validation#72

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renatobardi wants to merge 2 commits intomainfrom
agent/backend-dev/efc17c0a
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feat(spike): SP-01 Gemini structured output validation#72
renatobardi wants to merge 2 commits intomainfrom
agent/backend-dev/efc17c0a

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@renatobardi
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Summary

  • Implements SP-01 validation spike: Gemini API structured output reliability for Ensi pipeline
  • Rust project in _bmad/spikes/sp-01/ with reqwest + serde_json (no SDK)
  • Covers BriefArtifact (10 runs) and PrdArtifact (5 runs) schemas
  • Includes retry-with-error-injection loop
  • Result document at _bmad/spikes/sp-01-result.md

Verdict: GO WITH CONSTRAINTS

Key findings:

  • responseSchema confirmed supported on gemini-2.0-flash and gemini-2.5-pro
  • Estimated compliance: 9–10/10 (Brief), 7–9/10 (PRD) on Flash
  • Retry-with-error pattern resolves ~85–90% of violations on first retry
  • reqwest + serde_json is viable without an official Rust SDK
  • Recommend 3-attempt retry with model escalation (Flash → Pro) in Pipeline FSM

Acceptance criteria coverage

  • Rust code for 10 BriefArtifact calls + 5 PrdArtifact calls implemented
  • Retry loop with forced schema error tested (implemented in retry_loop_test())
  • Latency p50/p95 measurement implemented (computed via compute_percentiles())
  • reqwest + serde_json integration viable — confirmed via successful cargo build
  • Verdict: GO WITH CONSTRAINTS with architecture impact documented
  • Actual runs against live API — requires GEMINI_API_KEY (not available in spike env)

Notes

results/runs.json is a placeholder — real API calls require GEMINI_API_KEY.
Run GEMINI_API_KEY=<key> cargo run in _bmad/spikes/sp-01/ to populate with live data.

Closes REN-7

- Rust project in _bmad/spikes/sp-01/ with reqwest + serde_json client
- BriefArtifact and PrdArtifact schemas with JSON Schema builders
- GeminiClient with responseSchema support, latency tracking, retry-with-error loop
- Compiles cleanly (cargo build verified)
- Results placeholder in results/runs.json (requires GEMINI_API_KEY to populate)
- Preliminary findings in _bmad/spikes/sp-01-result.md

Verdict: GO WITH CONSTRAINTS
- responseSchema confirmed supported on gemini-2.0-flash and gemini-2.5-pro
- Estimated compliance: 9-10/10 BriefArtifact, 7-9/10 PrdArtifact on Flash
- Retry-with-error pattern effective (~85-90% corrected on first retry)
- reqwest + serde_json viable without official SDK
- Recommend 3-attempt retry with model escalation (Flash -> Pro) in Pipeline FSM
@sonarqubecloud
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