Data Machine assembles AI request context through directive classes registered on the datamachine_directives filter. The current implementation is documented in core-system/ai-directives.md.

Key current facts:

• AgentModeDirective injects built-in mode guidance for chat, pipeline, and system at priority 22.
• The former PipelineCoreDirective, ChatAgentDirective, SystemAgentDirective, and SiteContextDirective classes were removed during the AgentMode refactor.
• CoreMemoryFilesDirective injects registered memory files from the shared, agent, and user layers.
• Pipeline, flow, daily-memory, and chat-inventory directives add request-specific context after the core mode and memory layers.
• Tools are injected by RequestBuilder through PromptBuilder::setTools(), not by a directive class.

Use core-system/ai-directives.md as the authoritative reference for priorities, mode assignments, filters, and examples.