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feat(alerts): MCP tools for alert silences - #2291
MCP tools for alert silences. Stack 2/3, on #2290.
list_alert_silences: optional status, limit. Default is active and scheduled; ended only with status=ended.
create_alert_silence: reason, matchers (rule_ids, tags, services, environments), duration_minutes or ends_at, optional starts_at. No matcher, both or neither end, a non-positive duration or a malformed rule id are McpInvalidInputError. Approval-gated like the other mutating tools.
end_alert_silence: silence_id (UUID or sil_…).
get_incident_timeline shows when an incident's notifications are held back by a silence (with its reason), looking the silence up only when the incident names one.
Output schemas in packages/domain/src/mcp-outputs/alert-silences.ts; tools registered beside the alert rule tools; AlertSilencesService in the dispatcher layer; descriptors, agent instructions, web tool labels and the MCP docs table updated.
Verification
alert-silence-tools.test.ts 7/7 (create with duration, with and without starts_at; rejections; default list excludes ended; end; timeline line).
registry.contract, registry, mutating, tool-descriptors, alert-tools and the web tool-group tests pass; mcp:tools --check up to date; apps/ai typecheck and lint clean.
Follow-up: no dedicated chat-channel approval line for the two write tools yet (they show the generic "The change went through.").
A silence matches rules by rule id, tag, service and environment (fields AND,
values OR; services and environments must cover the rule's whole scope or the
incident's group). While one is in force, rules still evaluate and incidents
still open and resolve, but deliveries are written as `silenced` and the phone
push is skipped. The incident records the silence, and the first breaching check
after it ends sends the held-back page once. A resolve during a silence reaches
only destinations that were paged before it.
Adds the alert_silences table, AlertSilencesService, and /v2/alerts/silences
(list, retrieve, create, update, end) with audit events.
Adds list_alert_silences, create_alert_silence and end_alert_silence on
AlertSilencesService, and makes get_incident_timeline name the silence
holding back an incident's notifications.
…pages as paged
- The first page a silence holds back now sets silence_id / silenced_at in the
claimed incident refresh, not in a separate unfenced update that a failure or a
concurrent resolve could split from the silenced delivery rows.
- A resolve during a silence reaches every destination with a non-silenced page,
including one still queued or retrying, so a page in flight is never left open.
- Silence documents decode without throwing; the v2 handler turns a bad timestamp
into a 400 and counts a duration from the clamped start.
The change adds MCP tools to list, create, and end alert silences. It adds their output schemas and runtime wiring, and updates incident timeline results to include available silence details.
Changes: MCP alert silence tools
Layer / File(s)
Summary
MCP contracts and service wiring packages/domain/src/mcp-outputs/*, apps/ai/src/mcp/lib/alert-silences.ts, apps/ai/src/mcp/lib/params.ts, apps/ai/src/mcp/dispatcher.ts, apps/ai/src/mcp/tools/runtime-requirements.ts, apps/ai/test/mcp/unimplemented-tool-services.ts
Adds alert-silence output schemas and resource ID handling. Adds row formatting and error mappings, and makes AlertSilencesService available to MCP tools.
Adds tools to create, list, and end silences. Creation validates matchers and timing; listing supports status filters and pagination; ending decodes the silence ID. Registers the tools, adds tests, and documents and labels them.
Adds silence fields to incident timeline output. The timeline looks up available silence reasons and renders the notification state and reason when available.
sequenceDiagram
participant McpClient
participant CreateAlertSilenceTool
participant AlertSilencesService
McpClient->>CreateAlertSilenceTool: submit silence parameters
CreateAlertSilenceTool->>AlertSilencesService: validate and create silence for tenant
AlertSilencesService-->>CreateAlertSilenceTool: return silence
CreateAlertSilenceTool-->>McpClient: return mapped silence and follow-up actions
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Possibly related PRs
MapleTechLabs/maple#2290: Adds AlertSilencesService and incident silence fields used by these MCP tools and timeline updates.
MapleTechLabs/maple#2287: Adds incident acknowledgements and reminder suppression, which is related to handling held-back notifications.
Suggested reviewers:jeremyfunk
Merge Risk: Low · previous review 19975
Creating a silence with an extremely large duration can fail with an unmapped error instead of a clear invalid-input message. This is a narrow edge case, and the rest of the change looks sound, so the PR can merge with a small follow-up.
Pre-merge checks: 5
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- alert_silences is registered as org-scoped, so deleting an org purges it.
- The v2 create always sends the start it counted a duration from, and the service
keeps a start within its clock-skew allowance as given instead of clamping it to
a later now, so duration_minutes=60 is exactly an hour.
…ch-up rows with the refresh
- A builder_query rule that groups through its draft (rule-level groupBy null) now
matches a service or environment silence per group: alertSilenceGroupBy reads the
draft grouping and canonicalises service_name / deployment_environment.
- The catch-up page's delivery rows are prepared before, and inserted in, the same
claimed write that clears silenced_at, so a failure cannot lose the owed page.
- Drop the silence fields wrongly added to an anomaly fixture.
… silence
An acknowledged incident gets no reminder, so the page a silence held back is not
sent when the silence ends either. silenced_at stays, so an escalation that clears
the ack still sends it.
…calation settles it
- The catch-up is committed by a conditional update (acknowledged_at is null and a page is
still owed), so an ack that lands after the tick's prefetch keeps it owed and unsent.
- Any other page sent while one is owed (an escalation, which pages through an ack) clears
silenced_at, so the next check does not send a second one.
…ch-up is claimed
On a catch-up tick the refresh no longer advances lastNotifiedAt; the conditional catch-up
write does, so a late ack that keeps the page unsent leaves the anchor alone.
…during it
lastDeliveredEventType only tracks destination deliveries, so a phone-only rule never set
it. The resolve push is now skipped only when the page is still owed and nothing was
ever delivered.
… under a silence
An incident's owed mark equals its first trigger only when it opened under a silence, the
one case its trigger was never pushed; a reminder held later leaves a phone that was paged,
so it gets the all-clear. The silenced metric and log fire only when something was held.
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Actionable comments posted: 3
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @apps/ai/src/mcp/tools/create-alert-silence.ts:
- Line 13: Validate duration_minutes against the 30-day limit in
decodeCreateRequest before calculating endsAtMs or calling isoAt, so oversized
values are returned as McpInvalidInputError without reaching
DateTime.makeUnsafe.
Review comments at @apps/ai/src/mcp/tools/get-incident-timeline.ts:
- Around line 116-119: Update the silence lookup around silenceReasons to
batch-fetch the distinct silence IDs collected from incidents, reducing per-ID
database queries. Preserve the existing fallback for missing or unreadable
silences, and do not rely on list alone because it may omit older IDs.
Review comments at @apps/ai/src/mcp/tools/list-alert-silences.ts:
- Around line 101-117: Update the `list_alert_silences` response so that when
more matching silences exist but `output.limit` is `MAX_LIMIT`, the model-facing
text explicitly states that results are truncated and cannot be retrieved beyond
the limit; use reliable existing result metadata to determine whether more rows
exist, and preserve the current `next` behavior for other cases.
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🟢 Confidence 9/10 · safe to merge. Scoping, validation and the new list window check out at this head; only the earlier info-level notes (untested settled-hold wording, per-id silence lookups, re-spelled status literal) remain open. 3 notes · tests partial −1 · risk medium · 4/4 new units observable
Adds three MCP tools for alert silences and a silence line on the incident timeline; tenant scoping, duration caps and the default list's active/scheduled window hold. It does not touch the McpQueryError stack in registry.ts, and three earlier info notes remain open.
list_alert_silences, create_alert_silence and end_alert_silence registered with typed input errors
Default silence list shares one limit window between active and scheduled silences
get_incident_timeline names the silence that held a page back, with its reason
After this merges, Maple checks whether they stop.
7695cf4 · What was checked, coverage and telemetry details are on the Maple / review check. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.
⚠️Something changed after this shipped. Details below.
Deployed to maple-ai (pr-2310) at 2026-11-06 19:00 UTC as cd7872c, the first version after the merge (the merge commit itself never reported). Compared the 60 minutes before and after.
Maple looks once, an hour after the first deploy that carries the merge.
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MCP tools for alert silences. Stack 2/3, on #2290.
list_alert_silences: optionalstatus,limit. Default is active and scheduled; ended only withstatus=ended.create_alert_silence:reason, matchers (rule_ids,tags,services,environments),duration_minutesorends_at, optionalstarts_at. No matcher, both or neither end, a non-positive duration or a malformed rule id areMcpInvalidInputError. Approval-gated like the other mutating tools.end_alert_silence:silence_id(UUID orsil_…).get_incident_timelineshows when an incident's notifications are held back by a silence (with its reason), looking the silence up only when the incident names one.packages/domain/src/mcp-outputs/alert-silences.ts; tools registered beside the alert rule tools;AlertSilencesServicein the dispatcher layer; descriptors, agent instructions, web tool labels and the MCP docs table updated.Verification
alert-silence-tools.test.ts7/7 (create with duration, with and withoutstarts_at; rejections; default list excludes ended; end; timeline line).registry.contract,registry,mutating,tool-descriptors,alert-toolsand the web tool-group tests pass;mcp:tools --checkup to date;apps/aitypecheck and lint clean.Follow-up: no dedicated chat-channel approval line for the two write tools yet (they show the generic "The change went through.").
Stack: #2290 → this PR → dashboard.
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