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When agent.model equals the model the Hermes ACP session already reports as current, Multica was still replaying session/set_model. Hermes' set_model re-runs provider auto-detection on the model id, which for a provider:model id whose parsed provider matches the session's current provider (e.g. a named custom endpoint exposed as "custom") can mis-route to a different provider — custom:deepseek-v4-pro resolves into the OpenRouter catalog and the turn fails with an auth error. Only the retry via session resume, where the corrupted provider no longer matches the custom: prefix, succeeds. Capture the runtime's reported currentModelId from session/new and session/resume and skip the redundant switch when it already equals the requested model. An empty/unparsable current model falls through and still sends set_model, preserving prior behaviour. The explicit provider:model id is never rewritten. Upstream: NousResearch/hermes-agent#59089. MUL-5029 Co-authored-by: Bohan-J <bohan@devv.ai> Co-authored-by: multica-agent <github@multica.ai>