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docs: document package model experience

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Tianyi Cui
2026-07-12 02:12:36 +08:00
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packages/core/system-prompt/README.md
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System prompt assembly registry. Plugins contribute ordered text sections, tool-schema providers, named prompt variables, and authoritative named protections; the agent loop calls `assemble(context)` once per step, and `renderPrompt(assembly)` is the full system prompt the model sees. The plugin registers the harness-owned openers itself — the static `harness:identity` section and the deployment's `deployment:persona` section — so they exist for every agent regardless of which loop plugin drives it.
## Model Experience
| Context surface | What the model sees | Token effect |
|---|---|---|
| System prompt | Every assembly starts with `You are an AI agent powered by the DeepSeek Harness SDK.`, then the configured persona and ordered plugin sections after strict variable interpolation. Empty sections disappear; scoped sections and variables can shadow globals for one agent. | Identity is a fixed per-request cost. Persona and plugin text are repeated per request and scale with their rendered content. |
| Tool schemas | The model receives the collected, per-agent-visible tool names, descriptions, and JSON schemas in configured or lexicographic order after restrictions and assembly interception. | Schema tokens repeat on every request. Restricting a tool removes its entire schema cost for that agent; reordering changes cache shape but not semantic content. |
## Config
| Key | Default | Meaning |