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Collapse the relay header from 21 lines of prose to the mechanical minimum that survives imperfect relay-agent setup: ownership boundary, forwarded tool list, four JSON shapes, never-invent-names, and one-JSON-object rules. Trivial-prompt size drops from 1,978 to 1,370 chars (-31%), applied to every sampling request. Documented the recommended relay agent setup in README and marked RELAY_AGENT_PROMPT.md as the durable home for behavioural rules.
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What changed
The bridge repeated ~21 lines of static behavioural prose in every sampling request. It now sends the short, mechanical minimum that survives imperfect relay-agent setup:
Durable behavioural rules move to the relay agent's system prompt:
RELAY_AGENT_PROMPT.mdnow explicitly documents itself as that home, and the README documents the recommended agent setup.Measured locally
Trivial one-turn request with one tool:
Applied to every request of every tool loop.
Reliability guardrails (test-pinned)
A regression test asserts the minimised prompt still contains every reliability-critical phrase (tool list line, JSON-only rule, all four shapes, never-invent-names). The full parse-robustness suite and Codex SSE compatibility tests pass unchanged;
npm test: 76 pass, 0 fail.