Multi-action Gmail skill for agents — list/read/search/send messages, manage labels (add/remove/list), and toggle read/unread. Requires a google-oauth credential bound to the 'gmail' slot with gmail.modify scope.
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name
Gmail
description
Multi-action Gmail skill for agents — list/read/search/send messages, manage labels (add/remove/list), and toggle read/unread. Requires a google-oauth credential bound to the 'gmail' slot with gmail.modify scope.
version
1.1.0
category
communication
skillType
claude-skill
assignableRoles
["orchestrator","assistant"]
triggers
["send email","reply to email","search gmail","list emails","read email","check inbox","find email","mark email as read","mark email as unread","add label to email","remove label from email","list gmail labels"]
[{"slot":"gmail","type":"google-oauth","provider":"google","required":true,"requiredScopes":["https://www.googleapis.com/auth/gmail.modify"],"description":"Google account for Gmail operations. gmail.modify is a functional superset that covers read, send, label management, and read/unread toggling — one scope unlocks all 9 actions."}]
notices
[{"type":"requirement","message":"Requires a Google account added in Settings → Credentials with the gmail.modify scope (the default Crewly OAuth flow grants it automatically)."}]
Gmail (multi-action, v1.1.0)
Multi-action Gmail skill that lets agents manage messages and labels on behalf
of a connected Google account. The account is selected at execution time via
the gmail credential slot, so the same skill can be reused across multiple
Google accounts (e.g., work vs personal).
Note: a separate gmail-reader skill (read-only, plain-text output) is kept
for the orchestrator's credential-manager read-gmail action. This skill is
the structured-JSON, full-feature version intended for direct agent use.
Why a single gmail.modify scope?
gmail.modify is a Google-side functional superset that covers gmail.readonly,
gmail.send, and label/state mutations. The Crewly skill executor performs
string-exact scope matching (no superset awareness), so declaring the
single most-capable scope keeps the requirement check simple and lets all 9
actions share one OAuth grant.
Usage
Run via crewly_execute_skill with credentialBindings.gmail set to the
credential UUID of the Google account to use. Pass a JSON object on argv[1]
specifying the action and its parameters.
# Direct invocation (env vars must be set by the executor)
bash execute.sh '{"action":"list","q":"is:unread in:inbox","maxResults":10}'
bash execute.sh '{"action":"read","id":"18fa7b..."}'
bash execute.sh '{"action":"search","q":"from:foo@bar.com","maxResults":5}'
bash execute.sh '{"action":"send","to":"a@b.com","subject":"Hello","body":"Hi there."}'
bash execute.sh '{"action":"list-labels"}'
bash execute.sh '{"action":"add-label","id":"18fa...","labelId":"Label_5"}'
bash execute.sh '{"action":"remove-label","id":"18fa...","labelId":"Label_5"}'
bash execute.sh '{"action":"mark-as-read","id":"18fa..."}'
bash execute.sh '{"action":"mark-as-unread","id":"18fa..."}'
Actions
Email operations
list / search
List messages matching a Gmail search query. search is an alias for
list (shares code).
Fetch a single message by ID and return decoded headers + body.
Input:
{"action":"read","id":"18fa7b..."}
id (required) — Gmail message id (from a list result).
Output:
{"success":true,"id":"18fa7b...","threadId":"...","labelIds":["INBOX","UNREAD"],"headers":{"from":"...","to":"...","cc":"...","subject":"...","date":"..."},"body":"decoded plain text body","bodyHtml":"<...> (only if no text/plain part exists)","snippet":"..."}
The body extraction walks payload.parts[] recursively and prefers
text/plain. If only text/html is available, the HTML is returned as
bodyHtml and a tag-stripped plaintext fallback is placed in body.
Output: identical to add-label / remove-label (includes labelIds so the agent can confirm the transition).
Required Env (injected by the skill executor)
CREWLY_CRED_GMAIL_ACCESS_TOKEN — valid OAuth access token with gmail.modify
CREWLY_CRED_GMAIL_EMAIL — account email (used as From: in send)
The Crewly skill executor refreshes the access token before spawning this
script. Token refresh failures and missing-scope errors are surfaced by the
executor before this script ever runs — this script does NOT touch refresh
tokens or scope checks.
Errors
Exit 1 — input/usage error (missing token, missing required field, unknown action). JSON {"success":false,"error":"..."} on stdout, human message on stderr.
Exit 2 — Gmail API error (4xx/5xx). JSON {"success":false,"error":"..."} on stdout, status + Google's error message on stderr.
Raw access tokens and refresh tokens are never printed to stdout/stderr.
How the credential is resolved
Crewly's skill executor reads the credentials: frontmatter above, looks up
the credential bound to the gmail slot (either from credentialBindings
passed to crewly_execute_skill, or this skill's default), refreshes the
access token if needed, and injects it as CREWLY_CRED_GMAIL_ACCESS_TOKEN
before spawning this script. Output is auto-redacted of any injected secrets
before being returned to the agent.
Changelog
1.1.0 — added add-label, remove-label, list-labels, mark-as-read, mark-as-unread. Reduced requiredScopes to single gmail.modify (functional superset for all 9 actions).
1.0.0 — initial release with list, read, search, send.
