@jc4649/pi-autocompact

pi coding-agent extension: proactive auto-compaction with a configurable, cheap summarization model (formerly deepseek-compact)

Package details

extension

Install @jc4649/pi-autocompact from npm and Pi will load the resources declared by the package manifest.

$ pi install npm:@jc4649/pi-autocompact

Pi manifest JSON

{
  "extensions": [
    "./index.ts"
  ]
}

Pi packages can execute code and influence agent behavior. Review the source before installing third-party packages.

Formerly deepseek-compact.

Proactive, low-cost context compaction for the pi coding agent.

Three lightweight but effective parts:

Early trigger — compacts at 50% of the context window (capped at 256K tokens), far sooner than pi's default (window − 16K), so you rarely hit a hard wall mid-task.
Configurable summarizer — summarizes with a cheap model instead of your expensive conversation model. Default DeepSeek V4 Flash; override with PI_AUTOCOMPACT_MODEL. Falls back to the live session model if the configured one isn't available.
Tool-result stripping — before summarizing, elides bulky non-error tool results from the middle of the compact zone (head/tail, tool calls, and errors are preserved), shrinking what the summarizer has to read.

After an auto-triggered compaction it injects a follow-up turn so the agent resumes the task instead of stalling idle.

PI_AUTOCOMPACT_MODEL="provider/model"      # e.g. anthropic/claude-haiku-4-5

Everything after the first / is the model id (so openrouter/meta/llama-3 works). Unset or malformed → DeepSeek V4 Flash.

Disable pi's built-in auto-compaction so the two don't double-trigger, in ~/.pi/agent/settings.json (or <project>/.pi/settings.json):

{ "compaction": { "enabled": false } }

pi install @jc4649/pi-autocompact

Part of the pich harness.