Bohdan Triapitsyn
3cf1d82106
Add an opt-in OpenCode plugin that replaces the built-in provider behavioral prompt with a minimal identity while preserving environment, project, MCP, skill, history, and tool context. Track the active agent per session and apply the transform only to build and plan. Keep plan/build mode reminders and permission enforcement owned by OpenCode, leave all other agents untouched, and fail safely when the expected prompt boundary is absent. Expose the feature in Behavior settings with localized guidance, explicit Save + Reload application, settings search integration, persisted boolean validation, and managed-runtime lifecycle composition that does not load the plugin while disabled or on external OpenCode servers. Document the runtime contract and cover plugin materialization, config preservation, build/plan selection, agent switching, unknown prompt formats, and settings sanitization.
37 lines
1.7 KiB
Markdown
37 lines
1.7 KiB
Markdown
# 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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