Outlook API

Outlook API

Interact with Microsoft Outlook and Office 365 via the Microsoft Graph API. Read references/api-ref.md for the full endpoint reference and references/auth-guide.md for OAuth2 / Azure app registration details.

Argument Parsing

Parse $ARGUMENTS — the first token routes to the appropriate subcommand within the single consolidated script:

If no arguments or unrecognized first token, show this usage summary and stop.

First-Time Setup

Read references/auth-guide.md and guide the user through:

1. Creating a free Azure App Registration (personal account support)
2. Running auth setup to store the Client ID
3. Running auth login to complete OAuth2 PKCE browser flow

Operations

All operations use scripts/outlook.cs. Commands work in both bash and PowerShell shells (OpenCode's Bash tool uses pwsh.exe on Windows). Just call them directly - no need for cd or special shell syntax:

dotnet run scripts/outlook.cs -- auth setup <client-id>

The working directory is automatically set to the skill root when invoked through OpenCode, so relative paths like scripts/outlook.cs work correctly.

Auth

dotnet run scripts/outlook.cs -- auth $2 $3 $4 $5 $6 $7

Subcommands: setup <client-id>, login [--port <n>], refresh, status, logout

Mail

dotnet run scripts/outlook.cs -- mail $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14} ${15}

Subcommands:

• list [--folder <name>] [--top <n>] [--unread] [--from <addr>] [--subject <s>]
• read <id> [--full-body] [--raw]
• send --to <addr> --subject <s> --body <text> [--cc <a>] [--bcc <a>] [--html] [--body-file <p>] [--attach <path>]
• reply <id> --body <text> [--html] [--body-file <path>]
• reply-all <id> --body <text> [--html] [--body-file <path>]
• forward <id> --to <addr> [--body <text>] [--body-file <path>]
• delete <id>
• move <id> --to <folder>
• search <query> [--top <n>]
• flag <id>, unflag <id>, mark-read <id>, mark-unread <id>
• draft list
• draft create --to <addr> --subject <s> --body <text> [--html] [--body-file <path>] [--attach <path>]
• draft reply <messageId> [--body <text>] [--body-file <path>] [--html]
• draft reply-all <messageId> [--body <text>] [--body-file <path>] [--html]
• draft update <id> [--to <addr>] [--subject <s>] [--body <text>] [--body-file <path>]
• draft send <id>
• attachment list <messageId>
• attachment get <messageId> <attachmentId> [--out <path>]
• categories list
• categories apply <messageId> <categoryName>
• categories remove <messageId> <categoryName>

Calendar

dotnet run scripts/outlook.cs -- calendar $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11} ${12} ${13} ${14} ${15}

Subcommands:

• calendars List all calendars with IDs
• list [--start <date>] [--end <date>] [--top <n>] [--calendar <id>]
• get <id>
• create --subject <s> --start <dt> --end <dt> [--location <l>] [--body <b>] [--attendees <e,...>] [--all-day] [--reminder <minutes>] [--calendar <id>]
• update <id> [--subject <s>] [--start <dt>] [--end <dt>] [--location <l>] [--body <b>] [--reminder <minutes>]
• delete <id>
• respond <id> <accept|tentative|decline> [--comment <c>]

Contacts

dotnet run scripts/outlook.cs -- contacts $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11}

Subcommands:

• list [--top <n>]
• search <query>
• get <id>
• create --first <fn> --last <ln> [--email <e>] [--phone <p>] [--company <c>] [--title <t>]
• update <id> [--first <fn>] [--last <ln>] [--email <e>] [--phone <p>] [--company <c>] [--title <t>]
• delete <id>

Folders

dotnet run scripts/outlook.cs -- folders $2 $3 $4 $5 $6 $7 $8 $9

Subcommands:

• list [--parent <folderId>]
• create --name <n> [--parent <folderId>]
• rename <id> --name <n>
• delete <id>

Tasks

dotnet run scripts/outlook.cs -- tasks $2 $3 $4 $5 $6 $7 $8 $9 ${10} ${11}

Subcommands:

• lists List all To-Do task lists
• list [--list <listId>] [--top <n>] [--completed] Default list: "Tasks"
• get <taskId> [--list <listId>]
• create --title <t> [--list <id>] [--due <date>] [--body <notes>] [--important]
• complete <taskId> [--list <listId>]
• delete <taskId> [--list <listId>]

Note: Tasks require re-authentication after first setup to grant Tasks.ReadWrite scope. Run auth login if tasks return a 403.

Settings

dotnet run scripts/outlook.cs -- settings $2 $3 $4 $5 $6 $7 $8 $9

Subcommands:

• get Show timezone, auto-reply status, working hours
• timezone <TimeZoneId> e.g. "Central Standard Time"
• auto-reply enable --message <text> [--external-message <text>] [--start <dt>] [--end <dt>]
• auto-reply disable

Reference Files

• references/auth-guide.md — Azure app registration, OAuth2 PKCE flow, scopes, token management
• references/api-ref.md — Graph API endpoints, OData filters, common patterns, rate limits

Notes for Agents

• Always run auth status first to confirm the token is valid before performing operations
• Use --top to limit results; default is 10 for lists
• Message IDs from Graph API are long base64 strings — pass them exactly as returned
• Well-known folder names: inbox, drafts, sentitems, deleteditems, junkemail, outbox
• For multi-line bodies, write to a temp file and use --body-file <path> instead of --body
• Dates accept ISO 8601 format: 2026-04-15 or 2026-04-15T14:00:00

Search Strategy

mail search does full-text search across subject, body, and sender fields. Follow these steps when looking for a specific email:

1. Start broad, then narrow: Search by institution or person name first. If results are newsletters/noise, add topic keywords (speak, invitation, meeting, etc.)
2. Sender names don't always match institutions: An email from the University of Memphis may show sender as Emmanuel Oduro or eoduro@memphis.edu, not "University of Memphis". Try topic words from the email body when institution name searches miss.
3. Try multiple search angles in parallel if the first doesn't find it:
   • Institution name: mail search "University of Memphis"
   • Topic + location: mail search "speak Memphis"
   • Role + topic: mail search "UofM speaker"
4. Check sent items when researching history with a person: mail list --folder sentitems --top 50
5. Duplicates happen: Senders sometimes send the same email twice. When replying, use the most recent copy (latest Received timestamp).
6. Read the full body with mail read <id> --full-body once you identify the right email — previews truncate and may omit key details like event dates, times, or links.