Compatibility: If AskUserQuestion is unavailable, present options as a numbered list and wait for the user's reply. If Task is unavailable, run parallel steps sequentially. The context: fork and agent: frontmatter fields are Claude Code-specific — on OpenCode and VS Code Copilot they are ignored and the skill runs inline using the current model.

Update a spec plan. Accepts two input modes:

Annotations: > and >> markers already written directly in plan files
Conversational: a plain-language description of what to change, given as an argument or as the message that triggered this skill

Annotation syntax

> instruction — standalone line, applies to the block immediately below it:

> rewrite this phase for OAuth — drop all JWT references
### Phase 2 - Authentication

spec:update

Annotation syntax