SIGNL4 MCP by usefulapi

io.usefulapi/signl4

Read SIGNL4 alerts, teams, users and duty schedules; raise, acknowledge, close and annotate alerts.

Yes, your AI can use this right now.Answered a live MCP handshake in 144 ms with no sign-in needed and exposes 18 tools.

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URL: https://signl4.usefulapi.io/mcp

18 tools, verified live

Pulled straight from the server with tools/list on 2026-10-17.
signl4_list_teamsread-only

List the SIGNL4 teams the API key can access: id, name, description, time zone and member ids. Team ids are needed to raise alerts and to look up categories and duties. GET /v3/teams.

signl4_get_teamread-only

One SIGNL4 team: name, description, time zone, member ids. GET /v3/teams/{teamId}.

signl4_list_usersread-only

List the SIGNL4 users the key can access with name, e-mail, contact addresses, activation state and duty status per team (dutyMode, onDutyTime). User ids are needed to acknowledge/close/annotate alerts. GET /v3/users.

signl4_get_userread-only

One SIGNL4 user: name, e-mail, contact addresses, time zone and duty status per team. GET /v3/users/{userId}.

signl4_list_team_usersread-only

List the users of the given teams (all accessible teams by default) with duty status. Teams that cannot be read are reported under `errors`. GET /v3/teams/users.

signl4_list_categoriesread-only

List the alert categories of a team (name, color, keywords used to auto-classify alerts). The category name can be passed to signl4_raise_alert. GET /v3/categories/{teamId}.

signl4_list_alertsread-only

Search SIGNL4 alerts (signls), newest first, with status, severity, category and history (created, acknowledged, closed). Filter by team, status, creation time, text or external id. Up to 100 per page; pass the returned continuation_token to get the next page. POST /v3/signls/paged (a read).

signl4_get_alertread-only

Full detail of one alert: title, text, severity, category, status and delivery status, history (who acknowledged/closed it and when), parameters, attachments and escalations with per-user delivery. GET /v3/signls/{signlId}/details.

signl4_get_alert_timelineread-only

The ordered timeline of an alert: creation, notifications, acknowledgements, annotations, escalations and remote actions. GET /v3/signls/{signlId}/timeline.

signl4_get_alert_reportread-only

Alert volume and response statistics per team over several time periods: acknowledged, closed and unhandled counts, overall and per category (optionally for one user). Teams that cannot be read are reported under `errors`. GET /v3/signls/report.

signl4_raise_alertcan modify

WRITE: raise a new alert in a SIGNL4 team. THIS NOTIFIES REAL PEOPLE: every team member currently on duty is paged (push, SMS and/or voice call according to their settings) and the alert escalates if nobody acknowledges it. Only use it when the user clearly asked to alert the team; never for tests unless they said so. Not idempotent: a second call pages the team again. Returns the new alert incl.

signl4_acknowledge_alertcan modify

WRITE: acknowledge an alert on behalf of a SIGNL4 user (recorded in its history under that user). Stops escalation to further tiers for that alert. POST /v3/signls/{signlId}/acknowledge.

signl4_close_alertcan modify

WRITE: close (resolve) an alert on behalf of a SIGNL4 user; it leaves the open list and stops all further notifications. POST /v3/signls/{signlId}/close.

signl4_annotate_alertcan modify

WRITE: add a text note to an alert's timeline on behalf of a SIGNL4 user. The note is visible to the team in the app. It does not page anyone by itself. POST /v3/signls/{signlId}/annotate.

signl4_list_duty_schedulesread-only

Planned on-call duty schedules (who is on duty when): start/end, team, user, tier, stand-in and shift info. Filter by team, user and time window. POST /v3/schedules (a read).

signl4_get_duty_statusread-only

Whether a user is currently on or off duty in each of their teams (dutyMode, onDutyTime, tier). GET /v3/users/{userId}/dutyStatus.

signl4_get_duty_summaryread-only

Duty assistant info per team: whether it is enabled and the last two (or all) duty periods. GET /v3/duties/summary.

signl4_list_audit_logsread-only

Audit log of changes and events in the SIGNL4 subscription (who changed what, when). Filter by team, time window and message text; pass the returned continuation_token for the next page. GET /v3/audits.

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