night-market-model-and-harness-updates

# Night Market Model and Harness Updates When Anthropic ships a model or Claude Code ships a version, the pins scattered through this repo rot silently. This skill runs the sweep that finds the rot, researches what actually changed, applies the updates, and records where upstream stood so the next run reports only the new delta. The watermark is the point. Without it every audit restarts from zero and re-derives the same answer by hand. `.claude/upstream-baseline.json` holds the last recorded upstream state, and each run diffs against it. ## When to run | Trigger | Signal | |---------|--------| | Model release | A tier or model ID ships that the ledger does not record | | Harness release | `claude --version` differs from the ledger | | Scheduled check | Monthly, to catch a release nobody noticed | ## The five steps Run them in order. Each one gates the next. ```bash # 1. Detect. Deterministic, no model in the loop. python3 scripts/check_upstream_drift.py # 2. Research what changed (only when step 1 reports drift). # Release notes and model cards are mandatory sources. # 3. Map findings onto asset classes. # 4. Sweep the implicated classes. # 5. Prove, then record the new watermark. python3 scripts/check_upstream_drift.py && \ python3 scripts/check_agent_model_matrix.py ``` Step 5 runs before the ledger is written, never after. Recording a migration that has not passed its proof is the failure the ledger exists to prevent. ## What the detector proves and what i...