Pre-write admission control fixes parallel coding agents' merge conflicts (23.3%→50.0% pair pass) by quietly serializing 96.7% of the work
Claim Plane treats parallel-agent conflicts as deterministic pre-write admission over versioned change intents, and a 30-pair, three-seed confirmatory study on frozen CooperBench feature pairs shows it works on reliability: pair pass rises from 23.3% under unconstrained parallel execution to 50.0%, integration success from 65.6% to 96.7%, and on conflict-labeled pairs from 6.7% to 60.0%. The honest negative result is the valuable part — static admission serialized 96.7% of executions including 93.3% of the clean cases, so the reliability was bought by collapsing toward serial execution with no wall-clock speedup. The dynamic variant was more selective (serializing 66.7% of conflict cases, 13.3% of clean) but failed closed on undeclared scope in 46 of 90 executions, dropping pair pass to 22.2%, with 45 of those blocks hitting files already in the declarations — i.e. region undercoverage and weak amendment handling, not unknown files.
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