# update_calendar_event Updates an existing event in the Mac's Calendar app (Calendar.app) by ID. Pass only the fields you want to change — unspecified fields are left as-is. Get the event_id from list_calendar_events. For Microsoft 365 use the m365 calendar tools instead. Agent View of the PolicyLayer registry record for `update_calendar_event`. HTML page: https://policylayer.com/tools/com-local-mcp-local-mcp/update-calendar-event ## Facts - Tool: `update_calendar_event` - Server: Local (`local-mcp`) — https://policylayer.com/tools/com-local-mcp-local-mcp.md - Install: `npx -y local-mcp` - Homepage: https://github.com/lanchuske/local-mcp - Risk category: Write (Medium risk) - Registry record: grade F, identity unverified - Server auth posture: open - Server CORS policy: * - Server rate-limited: no - Parameters: 8 (1 required) - Recommended policy verdict: Rate-limited ## Parameters | Parameter | Type | Required | Description | | --- | --- | --- | --- | | `span` | string | no | For recurring events: 'this' (default) or 'future' | | `notes` | string | no | New notes — pass empty string to clear (optional) | | `title` | string | no | New title (optional) | | `confirm` | boolean | no | Must be true to apply changes | | `end_date` | string | no | New end datetime ISO 8601 (optional) | | `event_id` | string | yes | Event identifier from list_calendar_events | | `location` | string | no | New location — pass empty string to clear (optional) | | `start_date` | string | no | New start datetime ISO 8601 (optional) | Parameters from the server's own tool schema. ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "update_calendar_event", "arguments": { "event_id": "" } } } ``` ## Why update_calendar_event is rated Medium This tool modifies calendar data (updates events) but does not delete, destroy, or permanently remove data. Updates are reversible—modified events can be edited again or reverted. The blast radius is moderate: a misdirected agent could alter meeting times, locations, or details affecting the user's schedule and potentially impacting others invited to those events. From the tool's own definition: "Tool name is 'update_calendar_event' and description explicitly states it 'Updates an existing event' by modifying specified fields. This is a reversible modification operation." ## Use case AI agents use update_calendar_event to create or update resources in Local, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Local environment. ## Recommended policy (PolicyLayer) Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Local: ```json { "version": "1", "default": "deny", "tools": { "update_calendar_event": { "limits": [ { "counter": "update_calendar_event_rate", "window": "minute", "max": 30, "scope": "grant" } ] } } } ``` ## Other tools on Local (233) - `delete_calendar_event` — Destructive — https://policylayer.com/tools/com-local-mcp-local-mcp/delete-calendar-event.md - `delete_reminder` — Destructive — https://policylayer.com/tools/com-local-mcp-local-mcp/delete-reminder.md - `delete_reminder_list` — Destructive — https://policylayer.com/tools/com-local-mcp-local-mcp/delete-reminder-list.md - `m365_delete_event` — Destructive — https://policylayer.com/tools/com-local-mcp-local-mcp/m365-delete-event.md - `onedrive_delete_file` — Destructive — https://policylayer.com/tools/com-local-mcp-local-mcp/onedrive-delete-file.md - `recipe_delete` — Destructive — https://policylayer.com/tools/com-local-mcp-local-mcp/recipe-delete.md - `chrome_click` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/chrome-click.md - `chrome_evaluate_js` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/chrome-evaluate-js.md - `chrome_fill_form` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/chrome-fill-form.md - `chrome_go_back` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/chrome-go-back.md - `chrome_navigate` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/chrome-navigate.md - `chrome_type` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/chrome-type.md - `chrome_wait_for` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/chrome-wait-for.md - `nordvpn_diagnose` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/nordvpn-diagnose.md - `notion_open_page` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/notion-open-page.md - `recipe_run` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/recipe-run.md - `run_diagnostics` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/run-diagnostics.md - `run_terminal_command` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/run-terminal-command.md - `safari_click` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/safari-click.md - `safari_evaluate_js` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/safari-evaluate-js.md - `safari_fill_form` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/safari-fill-form.md - `safari_go_back` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/safari-go-back.md - `safari_navigate` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/safari-navigate.md - `safari_query_selector_all` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/safari-query-selector-all.md - `safari_type` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/safari-type.md - `safari_wait_for` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/safari-wait-for.md - `screen_record_start` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/screen-record-start.md - `screen_record_stop` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/screen-record-stop.md - `setup_install` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/setup-install.md - `ui_click` — Execute — https://policylayer.com/tools/com-local-mcp-local-mcp/ui-click.md - …and 203 more: https://policylayer.com/tools/com-local-mcp-local-mcp.md ## For agents This record is a snapshot. Live verdicts and the full registry: - Check every server in your MCP config at once: `npx -y policylayer stack` - Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md) - Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events` --- Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=com-local-mcp-local-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/com-local-mcp-local-mcp