claude-workflow-authoring-gotchas

Claude Code workflow scripts fail when the meta block uses concatenation, templates, identifiers, or function calls instead of strict literals. Validating that your exported metadata contains only pure literals prevents these runtime failures before execution.

To normalize args delivery in JavaScript workflow scripts, implement defensive parsing that handles object, JSON-string, and missing-args shapes. This ensures scripts behave predictably regardless of how different callers invoke the workflow.

Undefined values silently propagate into agent prompts when input arguments are not validated before use. Implementing ground-truth safeguards and informative missing-argument errors stops agents from self-healing onto the wrong source file.

Produce explicit, multi-line missing-argument errors that display the missing field, the received args, and correct invocation syntax. This requires defensive args parsing to detect the missing input and format the diagnostic output.

You need strict literal metadata validation when authoring or debugging JavaScript workflow tools that use exported meta blocks. It is required before shipping to avoid multiple rounds of trial-and-error caused by malformed metadata breaking execution.

This approach specifically applies to authoring and debugging JavaScript workflow tools that use parameterized agent prompts. The ground-truth safeguards and args normalization target JavaScript execution environments within Claude Code.