feat(plugin): add session.start hook for session initialization#15224
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coalminer1776 wants to merge 3 commits intoanomalyco:devfrom
Open
feat(plugin): add session.start hook for session initialization#15224coalminer1776 wants to merge 3 commits intoanomalyco:devfrom
coalminer1776 wants to merge 3 commits intoanomalyco:devfrom
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added 3 commits
February 26, 2026 09:35
- Add session.start hook type to plugin system - Trigger hook on first message in session - Allows plugins to inject context into system prompt
- Plugin demonstrates session.start hook functionality - Logs when hook fires - Injects test context into system prompt
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Issue for this PR
Feature request for session.start hook - addresses similar functionality to Claude Code's SessionStart hook for session initialization.
Type of change
What does this PR do?
Adds a new plugin hook
session.startthat fires when the first message is sent in a session. This allows plugins to inject custom context into the system prompt at session start.Changes made:
session.starthook type definition inpackages/plugin/src/index.tspackages/opencode/src/session/prompt.tsthat:Why it works:
The implementation follows the same pattern as existing hooks like
experimental.chat.system.transformand other session hooks in the codebase. Plugins can now register asession.starthook that receives session info and returns context strings which are prepended to the system prompt.How did you verify your code works?
bun run typecheck)bun run build)Screenshots / recordings
N/A - no UI changes
Checklist