# 9th Protocol

## Docs

- [Introduction](https://docs.9thprotocol.com/introduction.md): 9th Protocol is an agentic coding CLI that runs in your terminal, on whichever model fits the task.
- [Installation](https://docs.9thprotocol.com/installation.md): Install the 9p CLI from npm and sign in.
- [Quickstart](https://docs.9thprotocol.com/quickstart.md): From install to a real code change in about a minute.
- [Authentication](https://docs.9thprotocol.com/authentication.md): Sign in with the device flow, use your own OpenRouter key, or authenticate with environment variables.
- [CLI reference](https://docs.9thprotocol.com/cli.md): Every 9p command, slash command, and configuration file.
- [Permissions](https://docs.9thprotocol.com/permissions.md): What 9p can do without asking, and how to change it.
- [Models & Auto routing](https://docs.9thprotocol.com/models.md): How 9p picks a model for each turn, and how to override it.
- [Context & compaction](https://docs.9thprotocol.com/context.md): How 9p keeps a long session inside the model's context window.
- [Sub-agents](https://docs.9thprotocol.com/sub-agents.md): Parallel agents with their own context for search and unattended work.
- [Memory](https://docs.9thprotocol.com/memory.md): Standing instructions 9p reads at the start of every session.
- [Vault](https://docs.9thprotocol.com/vault.md): A folder of linked markdown that 9p navigates instead of re-reading your codebase.
- [Skills](https://docs.9thprotocol.com/skills.md): Package a repeated workflow into a slash command.
- [MCP servers](https://docs.9thprotocol.com/mcp.md): Add any Model Context Protocol server's tools to a session.
- [VS Code](https://docs.9thprotocol.com/vscode.md): Run 9p inside your editor.
- [9p serve](https://docs.9thprotocol.com/serve.md): A local browser session with the same engine as the CLI.
- [Plans](https://docs.9thprotocol.com/plans.md): What each plan includes and which models it unlocks.
- [Credits & usage](https://docs.9thprotocol.com/credits.md): How metering works, why cache hits matter, and where to see your spend.
- [SDK](https://docs.9thprotocol.com/sdk.md): Programmatic access to the 9th Protocol agent.