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Armin Ronacher

Last updated: Sep 5, 2026
RoleEngineer; creator of Flask · Earendil
Sources17 cited fields · high confidence
@mitsuhikolucumr.pocoo.org

Moved from Claude Code to Pi, uses model-swapping and session branches, and prefers hand-built skills and scripts over MCP.

“Pi happens to be, at this point, the coding agent that I use almost exclusively.” lucumr.pocoo.org

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Loadout

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Armin Ronacher’s loadout

Harness
pi
Recent writing discusses using Pi as the harness for Claude models and Codex experiments.
Model
GPT-5.6 Sol
Used via Pi in a conversation with Fable; the source does not explicitly designate a primary model.
Also uses
Claude Fable
Used via Pi.
EditorVim
ToolsHand-crafted Pi skills+2 more

3 views · 0 equipped

Models

GPT-5.6 Sol
Used via Pi in a conversation with Fable; the source does not explicitly designate a primary model.
lucumr.pocoo.org, 2026-09 ↗
Claude Fable
Used via Pi.
lucumr.pocoo.org, 2026-09 ↗
Kimi K3
Discussed alongside Sol in recent Pi work.
lucumr.pocoo.org, 2026-09 ↗
Claude Opus 4.8
Tested in Pi; version is explicitly named.
lucumr.pocoo.org, 2026-07 ↗
Claude Sonnet 5
Tested alongside Opus 4.8.
lucumr.pocoo.org, 2026-07 ↗
GPT-5.2 Codex
Used for unattended overnight test fixing and routinely for code review after PRs.
lucumr.pocoo.org, 2026-01 ↗

Editor & terminal

Vim
Hands-off agentic workflow diminished the IDE role and revived his Vim usage.
lucumr.pocoo.org, 2025-06 ↗

Tools

Hand-crafted Pi skills
Uses skills he builds himself, including browser automation through CDP and commit/changelog helpers.
lucumr.pocoo.org, 2026-01 ↗
Playwright MCP
His main MCP exception in the 2025 Claude Code setup was browser automation.
lucumr.pocoo.org, 2025-06 ↗
Local issue tracker and Pi review/todos extensions
Uses a locally built agent-specific tracker plus /todos and /review extensions.
lucumr.pocoo.org, 2026-01 ↗

Workflow

  1. 1Reviews model results and steers the run instead of relying on fully hands-off execution.lucumr.pocoo.org, 2026-06
  2. 2Run agents with full permissions via a claude-yolo alias, accepting the risk in exchange for hands-off execution.lucumr.pocoo.org, 2025-06
  3. 3Use Pi session branches for side quests, then return to the main session with a summary.lucumr.pocoo.org, 2026-01
  4. 4Build a tight validation loop around explicit tests and snapshots, then let the agent grind through remaining failures.lucumr.pocoo.org, 2026-01
  5. 5Prefer regular tools, scripts, and generated code over MCP when they compose more reliably.lucumr.pocoo.org, 2025-07

Config

mitsuhiko/agent-stuff
Public personal Pi package containing skills, extensions, prompt commands, themes, and command shims.
github.com ↗

Timeline

  1. 2026-09-05ModelGPT-5.6 Sollucumr.pocoo.org, 2026-09
  2. 2026-09-05Also usesClaude Fablelucumr.pocoo.org, 2026-09
  3. 2026-09-05Also usesKimi K3lucumr.pocoo.org, 2026-09
  4. 2026-07-04Harnesspilucumr.pocoo.org, 2026-07
  5. 2026-07-04Also usesClaude Opus 4.8lucumr.pocoo.org, 2026-07
  6. 2026-07-04Also usesClaude Sonnet 5lucumr.pocoo.org, 2026-07
  7. 2026-01-31ToolsHand-crafted Pi skillslucumr.pocoo.org, 2026-01
  8. 2026-01-31ToolsLocal issue tracker and Pi review/todos extensionslucumr.pocoo.org, 2026-01
  9. 2026-01-14Also usesGPT-5.2 Codexlucumr.pocoo.org, 2026-01
  10. 2025-06-12EditorVimlucumr.pocoo.org, 2025-06
  11. 2025-06-12ToolsPlaywright MCPlucumr.pocoo.org, 2025-06

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