Claude Mods: Flipping the Harness Inside Out
Latent Space Dan McAteer
Claude Mods lets users customize Claude Code by running JavaScript/TypeScript plugins that change the agent harness’s prompting, tool-call, and rendering behavior to create a programmable “attention interface.” Next Steps Supervisor triggers after 8 or more tool calls (and after Oct 15 it showed up in 99 of 111 turns), adding both extra attention prompts and extra compute cost. As a result, human attention becomes part of the harness loop via fixable mods, but may create noise, trust concerns (mods aren’t sandboxed), and recurring token usage.
Why it matters
Claude Mods is an early form of the Attention Interface. It flips the agent harness paradigm from the harness facing the machine, to the harness facing the human.