---
phase: 19-mcp-chunk-response
verified: 2026-02-24T17:00:00Z
status: passed
score: 6/6 must-haves verified
re_verification: false
---

# Phase 19: MCP Chunk Response Verification Report

**Phase Goal:** MCP `corpus_search` results become self-contained units of knowledge with exact line boundaries and full chunk text
**Verified:** 2026-02-24T17:00:00Z
**Status:** passed
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| #   | Truth                                                                              | Status     | Evidence                                                                                    |
| --- | ---------------------------------------------------------------------------------- | ---------- | ------------------------------------------------------------------------------------------- |
| 1   | MCP corpus_search results include a 'text' field with full untruncated chunk content | ✓ VERIFIED | `server.py` line 108: `"text": str(row.get("chunk_text", "") or "")` — test `test_corpus_search_text_field_present` asserts `r["text"] == "def foo():\n    pass"` |
| 2   | MCP corpus_search results include 'start_line' and 'end_line' fields               | ✓ VERIFIED | `server.py` lines 109-110: both fields present; `test_corpus_search_line_bounds_present` asserts `r["start_line"] == 10`, `r["end_line"] == 12` |
| 3   | The 'text' field appears first in result dicts (content-first ordering)            | ✓ VERIFIED | AST parse confirms first key is `"text"`; `test_corpus_search_text_field_is_first_key` asserts `list(r.keys())[0] == "text"` |
| 4   | Legacy rows (chunk_text empty) return text='' without raising                      | ✓ VERIFIED | `str(row.get("chunk_text", "") or "")` handles None/empty; `test_corpus_search_legacy_row_empty_text` passes |
| 5   | Results no longer include 'snippet' or 'full_content' (no whole-file reads)        | ✓ VERIFIED | grep of `server.py` finds zero occurrences of `snippet`, `full_content`, `read_text`, `Path`, `extract_snippet`; regression guard tests pass |
| 6   | A test asserts that 'snippet' does NOT appear in results (regression guard)        | ✓ VERIFIED | `test_corpus_search_no_snippet_field` at line 264 asserts `"snippet" not in r`; `test_corpus_search_no_full_content_field` and `test_corpus_search_no_content_error_field` also present |

**Score:** 6/6 truths verified

### Required Artifacts

| Artifact                             | Expected                                          | Status     | Details                                                                   |
| ------------------------------------ | ------------------------------------------------- | ---------- | ------------------------------------------------------------------------- |
| `src/corpus_analyzer/mcp/server.py`  | corpus_search tool with chunk-level response fields | ✓ VERIFIED | Contains `chunk_text` at line 108; substantive (121 lines); wired via 14 test imports |
| `tests/mcp/test_server.py`           | TDD tests for new response shape                  | ✓ VERIFIED | Contains all 7 required test functions; 14 tests total; all passing       |

**Artifact detail — test functions declared in `tests/mcp/test_server.py`:**

| Function                                    | Present |
| ------------------------------------------- | ------- |
| `test_corpus_search_text_field_present`     | Yes (line 177) |
| `test_corpus_search_line_bounds_present`    | Yes (line 205) |
| `test_corpus_search_legacy_row_empty_text`  | Yes (line 234) |
| `test_corpus_search_no_snippet_field`       | Yes (line 264) |
| `test_corpus_search_no_full_content_field`  | Yes (line 292) |
| `test_corpus_search_text_field_is_first_key`| Yes (line 320) |
| `test_corpus_search_no_content_error_field` | Yes (line 348) |

### Key Link Verification

| From                        | To                            | Via                                                        | Status   | Details                                                  |
| --------------------------- | ----------------------------- | ---------------------------------------------------------- | -------- | -------------------------------------------------------- |
| `tests/mcp/test_server.py`  | `src/corpus_analyzer/mcp/server.py` | `from corpus_analyzer.mcp.server import corpus_search` | ✓ WIRED  | Pattern found at lines 37, 76, 91, 105, 134 (and more)  |
| `src/corpus_analyzer/mcp/server.py` | LanceDB row dict        | `row.get("chunk_text", "")`                                | ✓ WIRED  | Lines 108-110 use `row.get("chunk_text", "")`, `row.get("start_line", 0)`, `row.get("end_line", 0)` |

### Requirements Coverage

| Requirement | Source Plan   | Description                                                                                                   | Status      | Evidence                                                                 |
| ----------- | ------------- | ------------------------------------------------------------------------------------------------------------- | ----------- | ------------------------------------------------------------------------ |
| CHUNK-03    | 19-01-PLAN.md | MCP `corpus_search` response includes `start_line`, `end_line`, and full untruncated `text` per result — self-contained unit of knowledge for LLM callers | ✓ SATISFIED | All three fields present in `server.py` result dict; 7 regression-guarding tests pass; REQUIREMENTS.md marks status as Complete |

No orphaned requirements — REQUIREMENTS.md maps CHUNK-03 to Phase 19 and the plan claims it.

### Anti-Patterns Found

No anti-patterns detected. Grep of both modified files found zero occurrences of: TODO, FIXME, HACK, PLACEHOLDER, `return null`, `return {}`, `return []`, empty handlers, or placeholder comments.

### Human Verification Required

None. All assertions are programmatically verifiable. The response shape is fully covered by unit tests.

### Test Suite Results

- `tests/mcp/test_server.py`: **14/14 passed** (7 pre-existing + 7 new CHUNK-03 tests)
- Full suite: **345/345 passed** (no regressions)
- `ruff check src/corpus_analyzer/mcp/server.py`: clean
- `mypy src/corpus_analyzer/mcp/server.py`: clean

### Commits Verified

| Hash      | Message                                                        |
| --------- | -------------------------------------------------------------- |
| `55e9acd` | test(19-01): add RED tests for CHUNK-03 MCP response shape     |
| `7b8ab08` | feat(19-01): implement CHUNK-03 self-contained MCP chunk response |
| `d37ad78` | refactor(19-01): verify full suite green after CHUNK-03        |

All three commits exist in the repository and correspond to the TDD sequence documented in the SUMMARY.

### Gaps Summary

No gaps. Phase goal fully achieved.

---

_Verified: 2026-02-24T17:00:00Z_
_Verifier: Claude (gsd-verifier)_
