fix: default system prompt so the gateway skips the 7K-token cmd agent prompt - #2
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…cmd agent prompt Without params.system the gateway substitutes the ~7.3K-token Command Code CLI agent prompt (measured 7,378 prompt tokens vs 20 with a one-line system prompt on GLM-5.3), costing tokens on every call and steering the model to act as a coding agent with tools it does not have. MiniMax rejects a blank system, so default to a real one-liner, overridable via PCMC_DEFAULT_SYSTEM. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
systemmessage, the gateway substitutes the Command Codecmdagent prompt, about 7.3K tokens: coding-agent persona, CLI tools (file edit, bash, explore sub-agent), commit rules and a taste file.You are a helpful assistant., overridable viaPCMC_DEFAULT_SYSTEM) when the system message is missing or blank. Blank isn't an option: MiniMax rejects it with "The system field can't be blank".Test plan
npm test: 7/7 pass, including a new default-system test🤖 Generated with Claude Code