27d2914457
Adds a built-in mcp extension that reads mcp.json (agent dir, and .pi/mcp.json for trusted projects) in the common mcpServers format, connects stdio and streamable HTTP servers at session start, and registers their tools as mcp__<server>__<tool>. Calls go through the regular tool pipeline, so hooks and permission extensions apply. /mcp shows server status. By default a server's tools are codemode-only: the new nestedOnly tool flag keeps them executable for other tools but out of the model's tool declarations, and pi activates the codemode tool for them. "exposure": "direct" declares them to the model as well. structuredContent from tools with an outputSchema reaches codemode scripts as data.
3.2 KiB
Configuration
Pi supports user-level and project configuration. User-level configuration lives in the agent directory, which defaults to ~/.pi/agent. Project configuration lives in .pi under the working directory and loads after project trust is granted. The only exception is sessionDir, which Pi reads before resolving trust so it can locate sessions.
In interactive mode, use /settings to change common preferences. For other options, ask Pi to update the configuration or edit the relevant files directly. Run /reload after manually changing settings, keybindings, instructions, or resources.
Agent directory
The agent directory is shown as <agent-dir> below. Set its location with the PI_CODING_AGENT_DIR environment variable or the SDK's agentDir option.
| Path | Responsibility |
|---|---|
<agent-dir>/settings.json |
User-level settings, including preferences, defaults, resource paths, and Pi package declarations. |
<agent-dir>/keybindings.json |
Custom terminal UI and application keybindings. |
<agent-dir>/mcp.json |
MCP servers available in every project. |
<agent-dir>/models.json |
Compatible endpoints, models, and model overrides. |
<agent-dir>/auth.json |
Saved API keys and OAuth credentials. |
<agent-dir>/AGENTS.override.md, AGENTS.md, AGENTS.MD, CLAUDE.md, or CLAUDE.MD |
User instructions applied across working directories. |
<agent-dir>/SYSTEM.md |
Replaces Pi’s default system prompt. |
<agent-dir>/APPEND_SYSTEM.md |
Adds instructions to Pi’s system prompt. |
<agent-dir>/extensions/ |
User extensions. |
<agent-dir>/skills/ |
User skills and supporting files. |
<agent-dir>/prompts/ |
User prompt templates exposed as slash commands. |
<agent-dir>/themes/ |
User theme files. |
Project .pi directory
| Path | Responsibility |
|---|---|
.pi/settings.json |
Project-level settings, resource paths, and Pi package declarations. |
.pi/mcp.json |
Project MCP servers. |
.pi/SYSTEM.md |
Replaces the system prompt for the project. |
.pi/APPEND_SYSTEM.md |
Adds project-specific instructions to the system prompt. |
.pi/extensions/ |
Project extensions. |
.pi/skills/ |
Project skills and supporting files. |
.pi/prompts/ |
Project prompt templates exposed as slash commands. |
.pi/themes/ |
Project theme files. |
For SYSTEM.md and APPEND_SYSTEM.md, the trusted project file takes precedence over the corresponding agent-directory file. Files with the same name are not combined.
Context files
Context files are separate from project .pi configuration. Pi loads them from the agent directory, the working directory, and its parent directories. A context file applies whenever Pi runs in its directory or anywhere below it.
An AGENTS.override.md replaces AGENTS.md or CLAUDE.md only in the same directory. It does not suppress context files from the agent directory or other directories.
Context-file discovery does not require project trust.