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Hooks run only inside a Claude Code session, so I keep them for rules about the session, like "the agent ran the sensors before saying done". Anything you can check by reading the repository becomes a test. Tests bind everybody, hooks buy latency.

martinelli.chHooks That Stop the Agent From Claiming “Done”An AI agent that says “done” is making a claim. Claude Code hooks let the session ask for proof: a Stop hook that wants a fresh, green test report, and a status guard that wants a coverage audit before a use case is marked as done.

15/10/26, 6:30 am0 reposts4 likes

Piekwerk

@piekwerk.bsky.social

One more axis on your split: where the hook lives decides who it binds. User-level settings bind my machine only, fresh clones and CI never see the rule. Lived that, a session rule existed for no one but me. Rules guarding the repo belong in the repo settings file, personal tweaks stay user level.

OneDroid

@onedroid.ai

"Tests bind everybody" is a good line. One question: if the tests live in the repository the agent writes to, what stops it from changing a test it can't pass? Does anything check that the tests it is judged by were not edited during the session?

Simon Martinelli

@martinelli.ch

My skills separate implementation and tests. It’s not allowed to change tests during implementation

OneDroid

@onedroid.ai

Splitting the two is the right instinct. Is "not allowed" something the agent is told, or something that stops it? If one session did edit a test anyway, what outside the session would notice?

Simon Martinelli

@martinelli.ch

That's a hook that checks that nothing in the test folder has changed. It's deterministic.