APC
Agent Project Context
A portable, open convention for storing project-level AI agent context inside a repository. One context layer. Any IDE. Your projects stay yours.
Protocol
Filesystem-first
Open
v0.1
One folder
All agent context lives in .apc/. No more per-tool duplicates.
Any runtime
Works with Claude Code, Cursor, Codex, OpenCode, or your own tooling.
Durable memory
Agent memory survives across sessions. Filesystem is source of truth.
MCP-compatible
Declare MCP servers in mcps.json. APC and MCP are complementary.
Canonical layout
project-root/
├── AGENTS.md ← agent registry
└── .apc/
├── project.json ← metadata
├── agents/
│ └── <slug>/
│ ├── <slug>.md ← role, model, skills
│ ├── memory.md ← durable memory
│ └── sessions/ ← session log
├── messages/ ← JSONL activity log
├── mcps.json ← MCP declarations
└── skills/ ← reusable prompts
├── AGENTS.md ← agent registry
└── .apc/
├── project.json ← metadata
├── agents/
│ └── <slug>/
│ ├── <slug>.md ← role, model, skills
│ ├── memory.md ← durable memory
│ └── sessions/ ← session log
├── messages/ ← JSONL activity log
├── mcps.json ← MCP declarations
└── skills/ ← reusable prompts