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Context and input

Context and input

Everything that becomes model-visible context: prompts, custom instructions, attachments, memory, compaction, and rewind boundaries.

How this volume fits

flowchart TD
    Prompt[Prompt sources] --> ModelContext[Model-visible context]
    Agents[Custom agents/skills] --> ModelContext
    Attachments[Attachments/files] --> ModelContext
    Memory[Memory/context board] --> ModelContext
    Compaction[Compaction] --> ModelContext
    Rewind[Checkpoints/rewind] --> ModelContext

Pages

Page	Why read it	File
Prompt sources in Copilot CLI	Static/runtime prompt sources, YAML package prompts, instructions, MCP prompts, hooks, and provider mapping.	`prompt-sources.md`
Custom agents and skills packaging	AGENTS.md, SKILL.md, plugin/remote/provided agents, skill directories, and enable/disable events.	`custom-agents-and-skills-packaging.md`
Attachment and file-ingestion pipeline	Native image/document attachments, tagged-file fallback, MIME detection, payload mapping, and limits.	`attachments-and-file-ingestion.md`
Memory and dynamic context board in Copilot CLI	Agentic memory API, local memory, dynamic context board, rem-agent, sidekicks, and shutdown consolidation.	`memory-and-context-board.md`
Conversation compaction and memory compression in Copilot CLI	/compact, automatic compaction, summary replacement, checkpoints, hooks, telemetry, and UI status.	`conversation-compaction.md`
Checkpoints, undo, rewind, and fork	/undo, /rewind, /fork, event-log truncation/replay, snapshot_rewind, and workspace events.	`checkpoints-undo-rewind.md`

Reading guidance

This volume explains how input becomes prompt/context.
Compaction and rewind describe how context is later rewritten or replayed.

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