Implementation Plan: T5-P6-A3-WP1 — Validate N=3 Extensibility#4148
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…xercise Classify every CodingAgentBackend Protocol method (30 total), every BackendCapabilities field (41), and both BackendConventions fields against opencode as the N=3 paper backend candidate. Sections 2-6 classify as TRIVIAL / SHIM-REQUIRED / GAP and convert every GAP into a named Protocol Change Request (PCR-001..PCR-013). - docs/design/paper-backend-n3-exercise.md: new 6-section classification document with gap catalogue and PCR rollup (8 Protocol-change PCRs, 3 implementation-only PCRs, 1 test-infrastructure PCR). - docs/design/README.md: new index row pointing to the exercise doc, placed after acp-session-contract.md for normative-reference adjacency. - tests/docs/test_filename_naming.py: add paper-backend-n3-exercise.md to ALLOWLIST["segment_count"] — 4 kebab segments exceeds the max-3 rule. Refs #4052
- Add translate_model (row 20, SHIM-REQUIRED) to Identity/introspection cluster; update cluster SHIM 0→1, Total row SHIM 13→14, GAP 5→4, and prose '5 GAP rows' → '4 GAP rows' - Fix PCR rollup 'Protocol change required' count 8→9 (9 IDs enumerated: PCR-001,002,003,004,005,007,008,010,013) - Fix Section 6.2 cross-reference '§5 B4v pattern' → '§5 B3b pattern' to match the probe-category label defined in Section 5.3 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Extend legend scope from "Sections 2–4" to "Sections 2–5" (L129): Section 5 Probe-category rollup uses the same TRIVIAL/SHIM-REQUIRED/GAP taxonomy and was omitted from the legend's stated coverage. - Correct Section 3.4 ACP-Mappable rollup (TRIVIAL 7→6, SHIM-REQUIRED 2→3): rows 1,2,5,13,14,17=6 TRIVIAL; rows 7,9,10=3 SHIM-REQUIRED; GAP=8 unchanged. - Correct Section 3.4 autoskillit-Local Extension rollup (TRIVIAL 9→11, GAP 4→2): rows 19–26,29–31,33=11 TRIVIAL; rows 22,27,32,34,35=5 SHIM-REQUIRED; rows 18,28=2 GAP. - Correct Section 3.4 Total row (TRIVIAL 21→22, SHIM-REQUIRED 8→9, GAP 12→10). - Update prose "12 GAP rows" → "10 GAP rows" and "8 SHIM-REQUIRED rows" → "9 SHIM-REQUIRED rows". Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Create
docs/design/paper-backend-n3-exercise.md— a six-section classification document that walks everyCodingAgentBackendProtocol method (30 total), everyBackendCapabilitiesfield (41), and bothBackendConventionsfields againstopencode-via-ACPas the N=3 paper backend candidate. Every surface is classified as TRIVIAL / SHIM-REQUIRED / GAP, and every GAP row produces a named Protocol change request in Section 6. Updatedocs/design/README.mdwith a new index row. Add the new filename to the segment-count allowlist intests/docs/test_filename_naming.py(the filename has 4 kebab segments, exceeding the max-3 rule enforced bytest_rule_4_max_three_segments).Implementation Plan
Plan file:
/home/talon/projects/autoskillit-runs/impl-20260628-145445-208417/.autoskillit/temp/make-plan/validate_n3_extensibility_plan_2026-06-28_150600.mdCloses #4052
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