Daniel Griesser
Engineer behind Ultimate, a self-extending agent harness on Pi Durable; argues that tight agent loops make tokens per second the bottleneck and that agents should be persistent project colleagues.
Daniel Griesser is a software engineer who writes at danielgriesser.com. He dictates his posts, has an LLM help structure them, and publishes each one with narrated audio. In "Ultimate" (October 2026) he describes his toy project of the same name: a Self-Extending Agent Harness built on Pi Durable that develops itself through coordinators, worker/reviewer subagents, git worktrees, a merge-and-test "lander" agent, and standing project agents.1
His central claims:
- A tight agent loop in an agent-ready codebase is the fastest way he has ever iterated on software, and tokens per second become the bottleneck.
- Durable primitives make the difference: persistent conversations, hot self-reload, and "notes" that inform an agent without waking it.
- Existing coding agents feel distant from the project. He wants a persistent colleague that lives inside each codebase.
He credits Armin Ronacher's Claude Code extension for Pi, which lets the whole setup run on a Claude subscription.1
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