Module hook 

ski hook — the hot path. Reads a hook event on stdin, decides which skills to inject, writes the host’s injection contract on stdout.

Fail open is the contract. Any error — bad stdin, missing index, IO failure — results in an empty injection and exit 0, never a blocked prompt.

Output by host:

• Claude (UserPromptSubmit): {hookSpecificOutput:{hookEventName, additionalContext}}, or nothing when there’s no injection.
• opencode: {skills:[...], inject:"..."} always (the TS adapter parses it).

Enums

Host

Functions

run

Run the hook for host. Always exits 0 (fail open); set SKI_DEBUG=1 to see the swallowed error on stderr when injection silently stops.