Context Assembly

文件与 Symbol

Symbol	Runtime 输入	Model-visible 输出
createSystemPromptAssembly()	一组 dependency owners	Context assembler
getSystemPrompt()	base/profile/identity/timezone/memory/workflow/channel/MCP/box/computer	system prompt sections
getMemorySection()	agent/user/project memory + snapshot	memory section
getTimeZoneSection()	request context	timezone section
getUserIdentitySection()	request context	identity section
getAutomationsSection()	automation store	automation section
getWorkflowsSection()	workflow store	workflow section
getChannelsSection()	connector manifests + connections	channel section
getAgentDirectorySection()	agents/groups	agent directory section
prepareAgentProfilePromptSnapshot()	profile + compaction epoch	stable snapshot

getSystemPrompt() 的真实形状

base prompt
  + spotlight
  + agent profile
  + user identity
  + multitask / policy sections
  + timezone
  + memory
  + automations
  + workflows
  + channels
  + agent directory
  + MCP custom instructions / discovery
  + remote box
  + computer section
        ↓
sections.join("\n\n")

这说明 Context Assembly 不是“拼聊天历史”，而是 Runtime-owned information projection。某项信息存在于 Runtime，不代表它必然进入当前 Model Request。

Snapshot / Compaction 相关

prepareAgentProfilePromptSnapshot() 与 memory snapshot 都带有 compaction epoch 语义。阅读时重点看：为什么动态状态需要先冻结成当前 Turn 的稳定视图，而不是 ModelClient 临调用时到处读 mutable state。

本地定位

rg -n "createSystemPromptAssembly|getSystemPrompt|getMemorySection|getTimeZoneSection|getWorkflowsSection|getChannelsSection|prepareAgentProfilePromptSnapshot" source/host/runner/system-prompt-assembly.ts

固定源码

• system-prompt-assembly.ts

关联知识文章

• Context 如何组装：Assembly Pipeline 与 Token Budget — Context Assembly 不是拼字符串，而是 Runtime Projection；createSystemPromptAssembly() → getSystemPrompt() → getMemorySection()