It seems like Gitleaks is complaining that the "anthropic-api-key" rule cannot be found. That means either it hasn't been defined in your configuration or there's a mismatch (maybe typos or ordering).

Things to check:

1. Definition Exists
   Make sure you've defined the anthropic-api-key rule before your aws-access-token rule. Gitleaks likely needs it earlier in the config so RequiredRules can reference it.

   Example config snippet:

   rules:
     - id: anthropic-api-key
       description: "Detect anthropic API keys"
       regex: ... 
   
     - id: aws-access-token
       description: "Detect AWS tokens, requires anthropic-api-key rule"
       regex: ...
       required_rules:
         - rule_id: anthropic-api-key
           within_lines: 5

2. Check for Typos
   YAML is whitespace-sensitive, and field names must match exactly (rule_id vs RuleID, etc.). In YAML/JSON, internal field names might differ from Go struct field names like RuleID.

3. Version Support
   Composite rules may be experimental or only supported in newer versions. Confirm you’re using a version of Gitleaks that supports required_rules or similar composite features.

4. Use Full Config Path
   If you’re loading configurations from multiple files, ensure that the file containing anthropic-api-key is actually loaded.

If none of that solves it:

Could you share:

• The full config file (or minimal reproducible example)?

• Gitleaks version you're using?

That’ll help narrow down whether it’s a bug, a config issue, or something else.