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Resolve the target account, exact filter criteria, and every requested action. Distinguish future-message filtering from changes to existing messages.
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List existing labels and filters with read-only calls:
gws gmail users labels list --params '{"userId":"me"}'
gws gmail users settings filters list --params '{"userId":"me"}'
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Reuse an exact existing label ID when possible. If a new label is needed, include its creation in the proposed changes:
gws gmail users labels create \
--params '{"userId":"me"}' \
--json '{"name":"<LABEL_NAME>"}'
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Build the filter from the user's criteria and actions. For example:
gws gmail users settings filters create \
--params '{"userId":"me"}' \
--json '{"criteria":{"from":"person@example.com"},"action":{"addLabelIds":["<LABEL_ID>"],"removeLabelIds":["INBOX"]}}'
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Run each proposed write with --dry-run, then show the target account, criteria, actions, and any new label. Ask for explicit confirmation immediately before creating anything.
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Execute the confirmed writes. Verify the returned filter ID and read the filter back from the filter list. If label creation succeeds but filter creation fails, report the leftover label rather than hiding the partial result.
Forwarding, deletion, spam handling, and broad criteria such as an empty sender or query deserve explicit emphasis in the confirmation because they can redirect or hide future mail.
