# Evidence: Block 17 · Service (block-17)

- block type: block
- date: 2026-08-22
- resulting state: closed/verified
- story points (combined assembled cost): 51330
- execution id: 20260823.025144.476Z-1fca168c

## Stories built
- Implement arithmetic and structural operators. (FLOW-001) [story]

## Acceptance tooling authorization
- FEATURE-FLOW-001.md#flow-001-conformance: executable=python3; scope=test; authorization=existing Target environment

## Stacked context
- compass: COMPASS.md (SP 3420)
- implements: FEATURE-FLOW-001.md (SP 428)
- context: jq-manual.txt (SP 32696)
- context: jq.test (SP 13058)
- context: ARCHITECTURE_compact.md (SP 154)
- stack: python_compact.md (SP 1534)

## Build directory changes
- jq_interpreter/evaluator.py
- tests/test_flow_001_operators.py

## Pre-build acceptance observation
- GREEN (prepassed): flow-001-conformance (FEATURE-FLOW-001.md)
  intent: The implementation passes the authoritative corpus slice covering arithmetic and structural operators.
  return code: 0
  stdout:
    {
      "candidate": [
        "/mnt/c/Users/barlo/projects/drydock/uat/jq/runs/20260822.044627/build/jq/jq"
      ],
      "corpus": "jq.test",
      "summary": {
        "pass": 174,
        "fail": 0,
        "error": 0,
        "skip": 0
      },
      "cases": []
    }

## Post-build programmatic acceptance
- PASS: flow-001-conformance (FEATURE-FLOW-001.md)
  intent: The implementation passes the authoritative corpus slice covering arithmetic and structural operators.
  target interpreter: /mnt/c/Users/barlo/projects/drydock/.venv/bin/python3
  provisioning: not required
  return code: 0
  stdout:
    {
      "candidate": [
        "/mnt/c/Users/barlo/projects/drydock/uat/jq/runs/20260822.044627/build/jq/jq"
      ],
      "corpus": "jq.test",
      "summary": {
        "pass": 174,
        "fail": 0,
        "error": 0,
        "skip": 0
      },
      "cases": []
    }

## Build summary
Implemented FLOW-001 operator fixes.

- Typed arithmetic excludes booleans.
- Added empty-string splitting.
- Update assignments use typed arithmetic/merge semantics.
- Added focused operator tests.

Validation: scoped conformance 174 passed, 0 failed/errors; full tests 79 passed.

RESULT: SUCCESS

FILES CHANGED:
- jq_interpreter/evaluator.py
- tests/test_flow_001_operators.py

SUMMARY:
Arithmetic and structural operator behavior is implemented and verified.

BLOCKERS:
- None