SIGNL4 MCP by usefulapi

io.usefulapiPublished by usefulapi.ioOfficial publisherv1.23.5Updated Nov 8, 2026

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

The publisher's own server: Ably MCP by usefulapi

VerifiedStreamable HTTPWeb executableProductivity & WorkflowSecurity & Monitoring

Overview

SIGNL4 MCP by usefulapi's hosted MCP server (signl4.usefulapi.io), published by usefulapi.io; no sign-in required; Streamable HTTP; 18 tools.

No AI overview yet: these facts come from the registry entry and the server itself.

Publisher
usefulapi.io
Endpoint
signl4.usefulapi.io
Last checked

Installation

In SourceWeft

  1. Open SIGNL4 MCP by usefulapi in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.usefulapi%2Fsignl4/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "signl4-by-usefulapi": {
      "type": "http",
      "url": "https://signl4.usefulapi.io/mcp"
    }
  }
}

README

SIGNL4 MCP by usefulapi

Use SIGNL4 from Claude, Cursor, or any MCP client — alerts, teams, users, categories and duty schedules, plus raising and handling alerts. Hosted, no local install: connect with your own SIGNL4 credentials.

Live endpoint: https://signl4.usefulapi.io/mcp · Homepage: https://usefulapi.io/signl4

Connect

  • Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://signl4.usefulapi.io/mcp.
  • Claude Code: claude mcp add --transport http signl4 https://signl4.usefulapi.io/mcp, then run /mcp to log in.
  • VS Code: Add to VS Code.
  • Cursor and other clients: add the URL as a remote MCP server:
json
{  "mcpServers": {    "signl4": {      "url": "https://signl4.usefulapi.io/mcp"    }  }}

Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your SIGNL4 credentials.

Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/signl4/

Tools

ToolTypeWhat it does
signl4_list_teamsreadList teams
signl4_get_teamreadGet team
signl4_list_usersreadList users
signl4_get_userreadGet user
signl4_list_team_usersreadList users of teams
signl4_list_categoriesreadList alert categories
signl4_list_alertsreadList alerts
signl4_get_alertreadGet alert
signl4_get_alert_timelinereadGet alert timeline
signl4_get_alert_reportreadGet alert report
signl4_raise_alertwriteRaise alert
signl4_acknowledge_alertwriteAcknowledge alert
signl4_close_alertwriteClose alert
signl4_annotate_alertwriteAnnotate alert
signl4_list_duty_schedulesreadList duty schedules
signl4_get_duty_statusreadGet user duty status
signl4_get_duty_summaryreadGet duty summary
signl4_list_audit_logsreadList audit logs
signl4_usage_statusmetaUsage status (free-tier meter)
signl4_request_featuremetaRequest a missing feature
signl4_upgrademetaUpgrade to Pro or Pro+
signl4_cancel_subscriptionmetaCancel the Pro subscription

read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Pro (per account)$9/mo or $90/yr (2 months free)Unlimited*

*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].

Pro covers this server only. Subscribe with signl4_upgrade (it returns a Stripe Checkout link). Cancel any time with signl4_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running signl4_upgrade before then undoes the cancel. Or write to [email protected].

License

MIT © usefulapi. Not affiliated with or endorsed by SIGNL4.

Source: servers/signl4/README.md at commit 4046075

Tools

18

signl4_list_teams

List teams

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.

Parametersteam_ids

signl4_get_team

Get team

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

Parametersteam_idrequired

signl4_list_users

List users

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.

Takes no parameters.

signl4_get_user

Get user

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

Parametersuser_idrequired

signl4_list_team_users

List users of teams

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.

Parametersteam_ids

signl4_list_categories

List alert categories

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}.

Parametersteam_idrequired

signl4_list_alerts

List alerts

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).

Parameterstextstatusteam_idsexternal_idmax_resultscategory_idscreated_aftercreated_beforecontinuation_token

signl4_get_alert

Get alert

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.

Parametersalert_idrequired

signl4_get_alert_timeline

Get alert timeline

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

Parametersalert_idrequired

signl4_get_alert_report

Get alert report

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.

Parametersuser_idteam_ids

signl4_raise_alert

Raise alert

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. its id. POST /v3/signls.

Parameterstextrequiredtitlerequiredteam_idrequiredcategoryseverityexternal_id

signl4_acknowledge_alert

Acknowledge alert

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.

Parameterscommentuser_idrequiredalert_idrequired

signl4_close_alert

Close alert

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.

Parameterscommentuser_idrequiredalert_idrequired

signl4_annotate_alert

Annotate alert

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.

Parameterstextrequireduser_idrequiredalert_idrequired

signl4_list_duty_schedules

List duty schedules

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).

Parameterstofromlimituser_idteam_ids

signl4_get_duty_status

Get user duty status

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

Parametersuser_idrequiredteam_ids

signl4_get_duty_summary

Get duty summary

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

Parametersteam_idslast_two_only

signl4_list_audit_logs

List audit logs

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.

Parameterstofromteam_idsmax_resultsmessage_containscontinuation_token

Version history

20
  1. v1.23.5LatestNov 8, 2026
  2. v1.23.4Nov 7, 2026
  3. v1.22.3Nov 5, 2026
  4. v1.22.2Nov 5, 2026
  5. v1.22.1Nov 4, 2026
  6. v1.22.0Nov 3, 2026
  7. v1.21.1Nov 3, 2026
  8. v1.20.0Nov 1, 2026
  9. v1.18.0Oct 31, 2026
  10. v1.17.0Oct 31, 2026
  11. v1.16.2Oct 30, 2026
  12. v1.16.0Oct 30, 2026
  13. v1.11.0Oct 26, 2026
  14. v1.8.3Oct 25, 2026
  15. v1.8.0Oct 25, 2026
  16. v1.7.0Oct 24, 2026
  17. v1.4.0Oct 23, 2026
  18. v1.3.4Oct 22, 2026
  19. v1.3.3Oct 21, 2026
  20. v1.0.0Oct 12, 2026

Score

100% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

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