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Delete calendar event

well_delete_calendar_event
Destructive

Delete an event from one of the user's own Google calendars.

Use this tool when the user asks to cancel, delete or remove a meeting or an event. Find the event first with well_list_calendar_events or well_get_calendar_event. Skip the lookup only when the user gave its event_id and either the event is not repeating or the user gave the exact start of the occurrence.

REQUIRED: event_id, scope, notify_attendees. scope is "occurrence" to delete just one meeting of a repeating event, or "series" to delete all of them; for a single event either value deletes that event. For one occurrence of a repeating event, also send occurrence_start, a timestamp with an offset (2026-10-12T10:00:00+02:00): the exact start the user gave, or else the occurrence_start value the list returned for it. Never guess it: if the user gave only a day, look the occurrence up with well_list_calendar_events first. For a repeating event, ask the user whether they mean this one occurrence or the whole series, and pass their answer as scope. Never assume it. notify_attendees: the guests of a cancelled event get the cancellation, so send true. Send false only when the user's own words say the guests are not told ("cancel it quietly", "don't tell them"). Do not ask about it before the call. Only the user's own calendars can be changed. If the user has not granted calendar access, the call fails with calendar_scope_not_granted and a link: give that link to the user as it is.

Returns { success: true, event_id } on success, or { success: false, error } on failure.

Write to the user own Google calendar. Compute no UTC offset yourself. The turn states the user time zone: read a time the user gives in that zone, and pass it to well_convert_time (from_timezone and to_timezone both that zone) to get the local_time with its offset. On an update, never look an event up only to read its zone.

Input Schema

NameRequiredDescriptionDefault
scopeYes
event_idYesThe event to delete, from well_list_calendar_events or well_get_calendar_event
workspace_idNoTarget workspace. Omit when the token authorizes one workspace. Required when it authorizes several — a write lands in exactly one workspace and this call would not say which.
conversation_idNoThe conversation id returned by the previous Well result, in its meta under well/conversation_id, in its structuredContent, or in its JSON text block. Pass it back on every call in the same conversation, including a call a card makes, so the chosen workspace and the earlier answers still apply. It decides the conversation on its own: nothing the host states about the session replaces it. Omit it only on the first call of a conversation.
idempotency_keyNoOptional client-supplied key. A retried write with the same key returns the original result instead of re-applying the operation.
workspace_scopeNoRestrict this call to the family: the token's primary workspace plus the company workspaces under it that you are a member of. Unrelated authorized workspaces drop out of the read; row reads merge across the family, while a per-workspace figure still reports exactly one workspace.
notify_attendeesYes
occurrence_startNo

Output Schema

NameRequiredDescriptionDefault
codeNo
errorNo
successYes
event_idNo
reply_linesNo
conversation_idNoThe conversation this result belongs to. Pass it back as the conversation_id argument on every later Well call in the same conversation.
near_candidatesNo
newly_connectedNoTools that connected to this workspace since the last result and that no session was told about yet, oldest first. Present only when at least one tool is new. The connected-line rule says when to tell an entry; when it does, one line per entry, in the person's language: "<name> is connected.". Never fold several entries into one sentence. Each entry comes back once, on one result only: never repeat its line later.
conversation_id_noteNoPresent only when the server opened a fresh lane, stating that no choice recorded earlier was read.
conversation_id_sourceNoWhere the conversation id came from: the host's own request meta, the caller's argument, or a fresh lane the server opened.
near_candidates_truncatedNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed5 schema fields changed
    • changedInput schema / properties / occurrence_start / pattern
      Previous value: -"^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"New value: +"^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
    • addedOutput schema / properties / code
      Added value: +{
      +  "type": "string"
      +}
    • addedOutput schema / properties / near_candidates
      Added value: +{
      +  "items": {
      +    "additionalProperties": false,
      +    "properties": {
      +      "company_id": {
      +        "type": "string"
      +      },
      +      "name": {
      +        "type": "string"
      +      }
      +    },
      +    "required": [
      +      "company_id",
      +      "name"
      +    ],
      +    "type": "object"
      +  },
      +  "type": "array"
      +}
    • addedOutput schema / properties / near_candidates_truncated
      Added value: +{
      +  "type": "boolean"
      +}
    • addedOutput schema / properties / reply_lines
      Added value: +{
      +  "items": {
      +    "type": "string"
      +  },
      +  "type": "array"
      +}
  2. Changed1 schema field changed
    • changedOutput schema / properties / newly_connected / description
      Previous value: -"Tools that connected to this workspace since the last result and that no session was told about yet, oldest first. Present only when at least one tool is new. Start the reply with one line per entry, in the person's language: \"<name> is connected.\". Never fold several entries into one sentence. Each entry comes back once, on one result only: never repeat its line later."New value: +"Tools that connected to this workspace since the last result and that no session was told about yet, oldest first. Present only when at least one tool is new. The connected-line rule says when to tell an entry; when it does, one line per entry, in the person's language: \"<name> is connected.\". Never fold several entries into one sentence. Each entry comes back once, on one result only: never repeat its line later."
  3. Changed1 schema field changed
    • addedInput schema / properties / workspace_scope
      Added value: +{
      +  "description": "Restrict this call to the family: the token's primary workspace plus the company workspaces under it that you are a member of. Unrelated authorized workspaces drop out of the read; row reads merge across the family, while a per-workspace figure still reports exactly one workspace.",
      +  "enum": [
      +    "family"
      +  ],
      +  "type": "string"
      +}
  4. Added

TDQS

A4.5/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare destructiveHint=true and openWorldHint=true, and the description goes well beyond them: it explains that only the user's own calendars can be changed, that missing access yields calendar_scope_not_granted with a link to hand back verbatim, that guessing occurrence_start is forbidden, and that guests are notified unless the user says otherwise. The remaining gap is that it does not say what happens to already-notified guests or whether deletion is reversible.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The core is front-loaded and dense with decision-relevant rules, but the closing paragraph drifts into update-specific and timezone-conversion guidance ('On an update, never look an event up only to read its zone') that is only loosely tied to deleting an event and adds noise to an already long description.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a destructive, open-world mutation with 8 parameters, the description covers everything an agent needs: prerequisites, required clarifications, the timestamp offset rule, the notification policy, the auth failure mode, and even the success/failure return shape despite an output schema existing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 63% schema coverage the description must compensate, and it does for the three required parameters: scope's two enum values are given operational meaning ('occurrence' vs 'series', either deletes a single event), occurrence_start gets a concrete timestamp format with offset and a sourcing rule, and notify_attendees gets a default-plus-exception policy. The workspace_id, conversation_id, idempotency_key and workspace_scope parameters are left entirely to their schema descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Opens with a specific verb+resource+scope: 'Delete an event from one of the user's own Google calendars.' It is clearly distinguishable from well_update_calendar_event, well_list_calendar_events and well_get_calendar_event, which it names as lookups rather than competing actions.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives explicit when-to-use triggers ('cancel, delete or remove a meeting or an event'), a prerequisite lookup with a stated exception ('skip the lookup only when the user gave its event_id and either the event is not repeating or the user gave the exact start'), and a mandatory clarification rule for repeating events ('ask the user whether they mean this one occurrence or the whole series... Never assume it').

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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