Flow Validation

Validation is a deterministic check of the current specification. It does not read the future, call a model, run a Script, persist Memory, or execute the Flow.

What validation checks

• supported block types and configuration value types;
• required source, Script, and database fields;
• unique block IDs and known upstream references;
• dependency cycles;
• valid connection endpoints; and
• balanced If/Else/Endif and Loop/Loop End/Break structure.

Some runtime conditions cannot be proven at validation time: a file can move, a provider can become unreachable, a credential can expire, and a Script can fail. Treat valid as “structurally eligible to run,” not “guaranteed to succeed.”

Fix a finding

Select the named block or connection, correct the exact field or topology issue, and let Canvas validate the new draft. If Chat proposes a change, candidate validation is still only evaluation of that candidate. Nothing changes until you explicitly request and approve apply.