37 lines
1.7 KiB
Markdown
37 lines
1.7 KiB
Markdown
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# Managed System Prompt Optimizer
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## Purpose
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This module injects an opt-in OpenCode plugin only when OpenChamber launches
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and owns the OpenCode process and `optimizeSystemPrompt` is enabled. The plugin
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replaces OpenCode's built-in behavioral/provider prompt with a short identity
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while preserving the environment, project instructions, MCP instructions,
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skills, conversation history, and separately supplied tools.
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## Runtime flow
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1. Settings persist `optimizeSystemPrompt` in OpenChamber's `settings.json`.
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2. The setting is applied when managed OpenCode restarts.
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3. The runtime materializes the plugin under
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`<openchamber-data-dir>/system-prompt/` and appends its `file://` URL to
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`OPENCODE_CONFIG_CONTENT` without replacing existing plugin entries.
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4. The plugin tracks the selected agent through `chat.message`. The transform
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runs only for sessions using the built-in `build` or `plan` agent.
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5. The transform locates OpenCode's environment boundary and removes only the
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preceding text. If the boundary is absent, it leaves the prompt unchanged.
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## Limitations
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OpenCode exposes the assembled prompt rather than structured sections. A custom
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prompt configured by overriding the `build` or `plan` agent occupies the same
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prefix as the built-in provider prompt, so the optimizer also removes that
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override. Other agents are never transformed. The setting is off by default.
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Plan-mode restrictions and build-mode transitions are not part of the removed
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prefix. OpenCode injects those as synthetic message reminders after system
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prompt transformation and separately enforces plan restrictions through tool
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permissions.
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The plugin is not injected for external OpenCode servers or VS Code's separate
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OpenCode lifecycle.
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