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* fix(claude): passthrough tool_use names must match client-declared casing A mapless restoreClaudePassthroughToolUseName upgraded known Claude Code tool names (bash -> Bash) on every Claude-format SSE passthrough. Clients that declared lowercase tool names (pi, OpenCode, ... on claude-format executors like devin-cli-agentic) received a tool_use name they never declared: client-side tool dispatch fails and echoing the history back hard-fails with devin-cli-agentic undeclared_historical_tool (live repro: pi + dva/glm-5-2 on a self-hosted router, 400 on every agentic turn). - restoreClaudePassthroughToolUseName: alias map first (renamed -> original), then normalize to the request's declared tools[] casing, never canonicalize undeclared names. Genuine Claude Code clients keep their #7926 protection (upstream downcase -> declared PascalCase). - devin-agentic serializer: case-insensitive fallback for historical tool_use names + render the declared spelling, so case drift can no longer kill a whole turn. Tests: tests/unit/claude-passthrough-tool-name-mapless-leak.test.ts, tests/unit/devin-agentic-serializer-case-insensitive-history.test.ts * fix(stream): direct ledger lookups in claude passthrough restore restoreClaudeToolName's canonical-upgrade fallback fires even when an alias ledger exists (canonical beats the identity match). The claude passthrough lane always carries a non-empty proxy_ ledger (buildClaudePassthroughToolNameMap), so every lowercase tool_use name was upgraded to Claude Code PascalCase on the SSE path while the JSON path (direct map.get) stayed correct — the live leak behind #12721. * docs(changelog): add fragment for claude passthrough tool_use casing fix Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com> --------- Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>