A minimal terminal coding agent harness.
Sub-agents, hashline edits, a permission gate, and MCP without context death — in a ~12 MB binary that stays out of your way.
Why phi
A harness that treats your context budget as the scarce resource it is.
Sub-agents
Spawn isolated jobs and watch the run unfold — without stuffing every turn into the parent context.
Hashline edits
Edit by @file#TAG and LINE#HASH anchors instead of rewriting whole files; stale anchors are rejected.
Permission gate
Gate or Ask before destructive tools fire. Safety is not optional when an agent can touch your tree.
In-TUI diff review
Open /diff to review the working tree, staged changes, or the last commit — leave line notes, then send them to the agent.
MCP without context death
Configure as many MCP servers as you want; tool schemas never enter the model prompt.
Any model
OpenAI-compatible or Anthropic — no vendor lock-in, switch models at runtime.
Skills & extensions
Package reusable procedures as SKILL.md; extend phi with native binaries — tools, commands, and event handlers via the PXB protocol.
Footprint
