bvandeusenandClaude Opus 5
2ee24b9d2b
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The only just-in-time rule surface was registered on `Write|Edit` and queried with `code or path`, so a rule could be retrieved at the moment of a code write and nowhere else. Every rule about which tool to reach for — don't curl the forge, don't stand up a stack, don't run the suite locally, don't branch — was unreachable exactly when it mattered, and residency in the always-on preload was the only surface it had. That is the pressure that grew the resident set to 31 against #3089's ceiling of ~23; it was never a judgment anybody made. A reflex generates no query, so an instruction to check the rules cannot catch one. A mechanical trigger can: the tool call IS the query, and a reflex has to become a tool call before it can do anything. `build_tool_rule_hint` is deliberately tool-agnostic — a name and a string — so widening the matcher later is a hooks.json edit with no server change. The hook starts on Bash, which is where the action reflexes live. The two pre-tool arms share ONE session ledger of already-named rules (`<state>/<sid>.rules.ids`). Two ledgers would mean a rule named by one arm gets re-offered by the other, and the hint that fires most often is exactly the one that must not repeat itself. A test asserts both scripts build the same path, and another checks the shell hook and the Python route agree on every query-arg name (rule 33) — a rename there fails silently, looking like a surface that never finds anything rather than a broken one. Deliberately silent on outage, unlike the prior-art hook: a write is occasional, a Bash call is not, and an outage line before every command is what gets a channel muted. `tier="conditional"` matches the write arm and is the transition point — an always-on rule is already resident, so re-tier one and it starts arriving here instead of in every session's preamble. `pre_tool_rule` joins RANKED_SOURCES: this arm chose what it showed, so a pull can settle whether the choice landed. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011cPyzNnegXHr5iRMzzy5KJ