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Add an app-server prompt prefix compatibility test - #51857
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## Why Detect changes to the default model-visible prefix relative to a released CLI, requiring those changes to be gated behind a default-off feature key. ## What changed Add `prompt_prefix_matches_release` to compare instructions, tools, and input preceding the user message using the same client and inputs. Each binary uses its bundled model catalog and feature defaults. The comparison removes response item IDs and transport metadata and normalizes fixture paths and session identifiers while preserving prompt text, whitespace, tool descriptions, schemas, and array ordering. Use the released binary supplied by `CONTRACT_EXECUTOR_BIN` when available; otherwise, compare two runs of the current binary to check determinism. GitOrigin-RevId: 1a69fb3abb6fc3df90a095e01bcf0d5de1818fac
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Add an app-server prompt prefix compatibility test
Why
Detect changes to the default model-visible prefix relative to a released CLI, requiring those changes to be gated behind a default-off feature key.
What changed
Add
prompt_prefix_matches_releaseto compare instructions, tools, and input preceding the user message using the same client and inputs. Each binary uses its bundled model catalog and feature defaults. The comparison removes response item IDs and transport metadata and normalizes fixture paths and session identifiers while preserving prompt text, whitespace, tool descriptions, schemas, and array ordering.Use the released binary supplied by
CONTRACT_EXECUTOR_BINwhen available; otherwise, compare two runs of the current binary to check determinism.