calendar: Workflow Automation for AI Agents | OpenAgentSkill

Overview

Use when listing, reading, creating, updating, or deleting Home Assistant calendar events through HA NOVA Relay.

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HA NOVA Calendar

Scope

Calendar event work:

list calendar entities
read events for one calendar over a bounded window
summarize upcoming events across selected calendars
create, update, or delete one event

Not in scope:

calendar dashboard edits
automation writes that use calendar triggers
calendar sharing, permissions, or provider-account settings

Bootstrap (once per session)

Read and follow ../ha-nova/session-bootstrap.md. Verify relay CLI: ha-nova relay health If this fails: ha-nova setup

Relay Contract

Use REST reads, one create service, and feature-gated WebSocket writes:

ha-nova relay core --method GET --path /api/calendars --out <result-file>
ha-nova relay core --method GET --path /api/states/<calendar_entity_id> --out <result-file>
ha-nova relay core --method GET --path <calendar-events-path> --out <result-file>
ha-nova relay core --method POST --path /api/services/calendar/create_event --body-file <payload-file> --out <result-file>
ha-nova relay ws --data-file <payload-file> --out <result-file> for calendar/event/create (recurring creates), calendar/event/update, and calendar/event/delete
ha-nova relay jq --file <result-file> --jq-file <filter-file>

<calendar-events-path> is: /api/calendars/<calendar_entity_id>?start=<timestamp>&end=<timestamp>

Relay-core response body is under .data.body (envelope contract: skills/ha-nova/relay-api.md → Standard Envelope).

Flow

List calendars with /api/calendars.
Resolve the requested calendar by exact entity_id or exact/clear name match.
If multiple calendars match, ask one blocking question.
Set a bounded event window:
- if the user gave start/end, use them
- otherwise default to now through the next 7 days
- if the user asks for an unbounded or very broad range, narrow it before querying
Query events with /api/calendars/<entity_id>?start=<start>&end=<end>.
Summarize read results:
- title/summary
- start and end
- all-day vs timed; all-day events carry date-only values with an EXCLUSIVE end — a one-day event on the 14th returns end = the 15th; report it as "on the 14th", never as "ends the 15th"
- timed events: render times in the user's local timezone, and say which timezone applies when the returned offset differs from it
- recurring events arrive pre-expanded as individual instances within the window — count and report them as such, not as one series
- location only when useful
- omit private descriptions unless the user explicitly asks

Create, update, or delete

Resolve one exact calendar and read /api/states/<entity_id>. Gate create on supported_features & 1, delete on & 2, and update on & 4; stop when the required bit is absent.
Read a bounded event window covering the target. Update/delete require an exact event with uid; use (uid, recurrence_id) as the instance identity. If several events match the user's description, ask one blocking question. Never guess.
Normalize event fields:
- timed events use start_date_time/end_date_time for create and dtstart/dtend inside the WS event object; both values use the Home Assistant timezone and end must be after start
- all-day events use start_date/end_date for REST create and date-only dtstart/dtend in the WS event (recurring create, update); end is exclusive
- create requires summary; optional description and location are included only when set
- a recurring create takes an RFC 5545 rrule string and goes through WS calendar/event/create (the REST service has no recurrence field); non-recurring creates keep the REST service
- update is a full event replacement: merge requested changes into the current summary/start/end/description/location/rrule instead of sending a patch; omit absent optional fields, use an empty string only to clear description/location, and omit rrule to clear recurrence
For an occurrence with recurrence_id, ask whether the scope is this occurrence (recurrence_range:"") or this and future occurrences ("THISANDFUTURE"). Bind that scope to the preview. For a single-occurrence update, omit rrule from the replacement event. Do not invent an entire-series mode.
Show the Preview Card with operation, calendar, exact event identity, summary, start/end, timezone or all-day range, changed fields, and recurrence scope. Create/update use natural bound confirmation; delete uses the typed confirm:<token> from the core rule.
Immediately before execution, re-read the target window and calendar state; this event set is the create baseline. Abort and rebuild the preview if capability, identity, current fields, or recurrence scope drifted.
Execute exactly one write:
- create: POST {"entity_id":"calendar.example","summary":"Event","start_date_time":"<start>","end_date_time":"<end>"} to

Error Handling

Relay/upstream failures follow skills/ha-nova/relay-api.md → Error Handling.
Unsupported feature or missing uid: stop and name the limitation; do not try another endpoint.
Timeout/502: verify first. Create may already have produced an event, so automatic retry risks a duplicate.
Provider rejection: surface the Home Assistant reason without guessing a corrected payload.

Output Format

Apply skills/ha-nova/output-rules.md to all user-facing output.

Calendar
Window
Events
Next step

These slots render the Report shape (output-rules.md); event groups follow the List Frame. For multiple calendars, group by calendar and keep each group short. Writes use the Preview Card and Result Card; report the exact bounded verification scope.

Safety

Preview before write: nothing is saved until the user confirms the shown preview.
Confirmation binds to the displayed preview and expires on any change to target, payload, endpoint, or scope (context skill → Active Preview Confirmation).
Pre-preview phrases ("do it", "go ahead", "implement the plan") authorize drafting and preview only — never the write itself.
Delete and destructive operations require the typed confirmation code confirm:<token> verbatim; "yes" or any natural-language reply is invalid.
Never guess entity, service, or config IDs — resolve them or ask.
Home Assistant is reached exclusively through ha-nova relay.
For any HA write this skill does not cover, STOP and invoke ha-nova:fallback first — never probe unfamiliar write endpoints.
Drafts follow skills/ha-nova/smallest-solution.md: the complete requested outcome in the simplest safe design, nothing for hypothetical future needs.
Create and update require natural confirmation; delete retains the core typed confirmation-code gate.
Calendar event writes have no HA NOVA revert. A provider recycle bin may exist but is not guaranteed; recreate only from a user-approved preview.
Always use bounded windows.
Never guess a calendar id from a partial name when multiple matches exist.
One event write at a time; no batch mutation.

References

Relay API: skills/ha-nova/relay-api.md
Shared write safety: skills/ha-nova/write-safety.md

View source ↗

File metadata

name: calendar
description: Use when listing, reading, creating, updating, or deleting Home Assistant calendar events through HA NOVA Relay.
license: MIT
compatibility: Requires the ha-nova CLI (run 'ha-nova setup' first) and the HA NOVA Relay in Home Assistant (App, or standalone container on Container/Core).

View original text

---
name: calendar
description: Use when listing, reading, creating, updating, or deleting Home Assistant calendar events through HA NOVA Relay.
license: MIT
compatibility: Requires the ha-nova CLI (run 'ha-nova setup' first) and the HA NOVA Relay in Home Assistant (App, or standalone container on Container/Core).
---

# HA NOVA Calendar

## Scope

Calendar event work:
- list calendar entities
- read events for one calendar over a bounded window
- summarize upcoming events across selected calendars
- create, update, or delete one event

Not in scope:
- calendar dashboard edits
- automation writes that use calendar triggers
- calendar sharing, permissions, or provider-account settings

## Bootstrap (once per session)

Read and follow `../ha-nova/session-bootstrap.md`.
Verify relay CLI: `ha-nova relay health`
If this fails: `ha-nova setup`

## Relay Contract

Use REST reads, one create service, and feature-gated WebSocket writes:
- `ha-nova relay core --method GET --path /api/calendars --out <result-file>`
- `ha-nova relay core --method GET --path /api/states/<calendar_entity_id> --out <result-file>`
- `ha-nova relay core --method GET --path <calendar-events-path> --out <result-file>`
- `ha-nova relay core --method POST --path /api/services/calendar/create_event --body-file <payload-file> --out <result-file>`
- `ha-nova relay ws --data-file <payload-file> --out <result-file>` for `calendar/event/create` (recurring creates), `calendar/event/update`, and `calendar/event/delete`
- `ha-nova relay jq --file <result-file> --jq-file <filter-file>`

`<calendar-events-path>` is:
`/api/calendars/<calendar_entity_id>?start=<timestamp>&end=<timestamp>`

Relay-core response body is under `.data.body` (envelope contract: `skills/ha-nova/relay-api.md` → Standard Envelope).

## Flow

1. List calendars with `/api/calendars`.
2. Resolve the requested calendar by exact `entity_id` or exact/clear name match.
3. If multiple calendars match, ask one blocking question.
4. Set a bounded event window:
   - if the user gave start/end, use them
   - otherwise default to now through the next 7 days
   - if the user asks for an unbounded or very broad range, narrow it before querying
5. Query events with `/api/calendars/<entity_id>?start=<start>&end=<end>`.
6. Summarize read results:
   - title/summary
   - start and end
   - all-day vs timed; all-day events carry date-only values with an EXCLUSIVE end — a one-day event on the 14th returns end = the 15th; report it as "on the 14th", never as "ends the 15th"
   - timed events: render times in the user's local timezone, and say which timezone applies when the returned offset differs from it
   - recurring events arrive pre-expanded as individual instances within the window — count and report them as such, not as one series
   - location only when useful
   - omit private descriptions unless the user explicitly asks

### Create, update, or delete

1. Resolve one exact calendar and read `/api/states/<entity_id>`. Gate create on `supported_features & 1`, delete on `& 2`, and update on `& 4`; stop when the required bit is absent.
2. Read a bounded event window covering the target. Update/delete require an exact event with `uid`; use `(uid, recurrence_id)` as the instance identity. If several events match the user's description, ask one blocking question. Never guess.
3. Normalize event fields:
   - timed events use `start_date_time`/`end_date_time` for create and `dtstart`/`dtend` inside the WS `event` object; both values use the Home Assistant timezone and end must be after start
   - all-day events use `start_date`/`end_date` for REST create and date-only `dtstart`/`dtend` in the WS `event` (recurring create, update); end is exclusive
   - create requires `summary`; optional `description` and `location` are included only when set
   - a recurring create takes an RFC 5545 `rrule` string and goes through WS `calendar/event/create` (the REST service has no recurrence field); non-recurring creates keep the REST service
   - update is a full event replacement: merge requested changes into the current summary/start/end/description/location/rrule instead of sending a patch; omit absent optional fields, use an empty string only to clear description/location, and omit `rrule` to clear recurrence
4. For an occurrence with `recurrence_id`, ask whether the scope is **this occurrence** (`recurrence_range:""`) or **this and future occurrences** (`"THISANDFUTURE"`). Bind that scope to the preview. For a single-occurrence update, omit `rrule` from the replacement event. Do not invent an entire-series mode.
5. Show the Preview Card with operation, calendar, exact event identity, summary, start/end, timezone or all-day range, changed fields, and recurrence scope. Create/update use natural bound confirmation; delete uses the typed `confirm:<token>` from the core rule.
6. Immediately before execution, re-read the target window and calendar state; this event set is the create baseline. Abort and rebuild the preview if capability, identity, current fields, or recurrence scope drifted.
7. Execute exactly one write:
   - create: POST `{"entity_id":"calendar.example","summary":"Event","start_date_time":"<start>","end_date_time":"<end>"}` to `/api/services/calendar/create_event`
   - recurring create: WS `{"type":"calendar/event/create","entity_id":"calendar.example","event":{"summary":"Event","dtstart":"<start>","dtend":"<end>","rrule":"FREQ=WEEKLY;BYDAY=MO"}}` — `dtstart`/`dtend` describe the FIRST instance
   - update: WS `{"type":"calendar/event/update","entity_id":"calendar.example","uid":"<uid>","recurrence_id":"<instance>","recurrence_range":"<range>","event":{"summary":"Event","dtstart":"<start>","dtend":"<end>"}}`; omit recurrence keys for a non-recurring event
   - delete: WS `{"type":"calendar/event/delete","entity_id":"calendar.example","uid":"<uid>","recurrence_id":"<instance>","recurrence_range":"<range>"}`; omit recurrence keys for a non-recurring event
8. Verify through bounded REST read-back, up to three reads over ten seconds:
   - create: compared with the baseline, exactly one new event must match the requested normalized fields; the service response alone is not identity evidence
   - recurring create: the read-back window returns the series pre-expanded — new instances sharing one `uid` and matching the `rrule` pattern; report them as ONE series (rule, first occurrence, count inside the window), never as separate events, and say instances beyond the window were not verified; a window that cannot hold the next expected occurrence proves no recurrence — report it unverified
   - update: the same `(uid, recurrence_id)` must contain the full requested fields; for `THISANDFUTURE`, also check the first later occurrence when one exists in the window and state that later events outside the window were not verified
   - delete: the target identity must be absent; for `THISANDFUTURE`, all occurrences with that `uid` from the selected instance onward must be absent within the window
   - ambiguous, stale, or delayed results are reported as not verified; never repeat a write automatically

## Error Handling

- Relay/upstream failures follow `skills/ha-nova/relay-api.md` → Error Handling.
- Unsupported feature or missing `uid`: stop and name the limitation; do not try another endpoint.
- Timeout/`502`: verify first. Create may already have produced an event, so automatic retry risks a duplicate.
- Provider rejection: surface the Home Assistant reason without guessing a corrected payload.

## Output Format

Apply `skills/ha-nova/output-rules.md` to all user-facing output.

- `Calendar`
- `Window`
- `Events`
- `Next step`

These slots render the Report shape (output-rules.md); event groups follow the List Frame. For multiple calendars, group by calendar and keep each group short. Writes use the Preview Card and Result Card; report the exact bounded verification scope.

## Safety

- Preview before write: nothing is saved until the user confirms the shown preview.
- Confirmation binds to the displayed preview and expires on any change to target, payload, endpoint, or scope (context skill → Active Preview Confirmation).
- Pre-preview phrases ("do it", "go ahead", "implement the plan") authorize drafting and preview only — never the write itself.
- Delete and destructive operations require the typed confirmation code `confirm:<token>` verbatim; "yes" or any natural-language reply is invalid.
- Never guess entity, service, or config IDs — resolve them or ask.
- Home Assistant is reached exclusively through `ha-nova relay`.
- For any HA write this skill does not cover, STOP and invoke `ha-nova:fallback` first — never probe unfamiliar write endpoints.

- Drafts follow `skills/ha-nova/smallest-solution.md`: the complete requested outcome in the simplest safe design, nothing for hypothetical future needs.

- Create and update require natural confirmation; delete retains the core typed confirmation-code gate.
- Calendar event writes have no HA NOVA revert. A provider recycle bin may exist but is not guaranteed; recreate only from a user-approved preview.
- Always use bounded windows.
- Never guess a calendar id from a partial name when multiple matches exist.
- One event write at a time; no batch mutation.

## References

- Relay API: `skills/ha-nova/relay-api.md`
- Shared write safety: `skills/ha-nova/write-safety.md`

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
Low GitHub adoption signal
AI review approval is missing
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 21 GitHub stars
Stars/forks activity: 21 stars, 1 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution
Review status: AI review approval is missing

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Source & usage notes

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Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: markusleben/ha-nova
License: MIT
Version: Unknown
Last GitHub push: Sep 13, 2026
Registry updated: Sep 14, 2026
Instruction path: skills/calendar/SKILL.md @ 8e63c4ed2bd0

Version reported in registry metadata; check source releases before relying on it.

Quality

55/100

Promising

Trust

57/100

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This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

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    "Low GitHub adoption signal",
    "No OpenAgentSkill engagement data yet",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "AI review approval is missing"
  ],
  "agent_contract": {
    "task_input": "Use calendar in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 65/100 Manual review",
      "Audit: 70/100 Needs review",
      "Safety: 26/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "markusleben-calendar (calendar)",
      "install_command": "npx skills add markusleben/ha-nova --skill calendar",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "markusleben-calendar",
      "task": "Use calendar in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/markusleben-calendar",
    "api": "https://www.openagentskill.com/api/agent/skills/markusleben-calendar",
    "audit": "https://www.openagentskill.com/skills/markusleben-calendar/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=markusleben-calendar&task=Use%20calendar%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20calendar%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20calendar%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/markusleben-calendar/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/markusleben-calendar"
  }
}

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Creator: markusleben
Source: markusleben/ha-nova
Indexed by: OpenAgentSkill community index

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This Registry indexed listing is attributed to markusleben but is not marked official yet. Claim it to add a verified owner signal and make future launch, install, and audit updates easier to trust.

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[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/markusleben-calendar?metric=listed&label=Listed)](https://www.openagentskill.com/skills/markusleben-calendar?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/markusleben-calendar?metric=trust&label=Trust)](https://www.openagentskill.com/skills/markusleben-calendar?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/markusleben-calendar?metric=audit&label=Audit)](https://www.openagentskill.com/skills/markusleben-calendar/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/markusleben-calendar?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/markusleben-calendar?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

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/api/services/calendar/create_event