io.github.rlrghb/outlook MCP Server

olk — Microsoft Outlook in Your Terminal

olk is a scriptable CLI and MCP server for Outlook mail, calendars, contacts, tasks, and OneDrive through Microsoft Graph. It works with personal Outlook.com accounts and enterprise Microsoft 365 accounts.

Install

brew install rlrghb/tap/olk
# or
go install github.com/rlrghb/olkcli/cmd/olk@latest

The npm package is olkcli; the installed command is olk:

npm install -g olkcli

See macOS notes if macOS asks for Keychain access after an upgrade.

Quick start

olk auth login
olk auth status
olk mail list --json --results-only --select id,subject,from
olk mail search 'from:person@example.com subject:urgent'
olk calendar view --days 7
olk contacts search "Alex"
olk todo lists list
olk drive ls

For work/school accounts and enterprise-only features:

olk auth login --enterprise

Common commands

See the command reference for all commands and flags.

Inline images in HTML drafts

Use a cid: URL in the HTML and supply the matching image with repeatable --inline CID=PATH flags. This works for new drafts and true threaded reply or reply-all drafts:

olk mail reply <ID> --draft --html \
  --body '<p>See both images:</p><img src="cid:logo"><img src="cid:steps">' \
  --inline logo=logo.png --inline steps=steps.png

olk mail drafts create --to person@example.com --subject "Instructions" --html \
  --body '<p>Follow these steps:</p><img src="cid:steps">' \
  --inline steps=steps.png

Each CID must be unique and referenced by the HTML. Files must be images and each must be under 3 MB, the Microsoft Graph simple-attachment limit. Draft commands do not send mail; immediate sends and forwards do not accept --inline.

Output and scripting

Results are written to stdout; diagnostics and prompts go to stderr.

olk mail list --json --results-only | jq '.[].subject'
olk contacts list --plain

Output modes are JSON (--json), TSV (--plain), and aligned tables by default. Use --concise to omit large bodies/previews and --select to limit fields where supported. See scripting and sync.

Safety defaults

• Use --no-write --no-send --no-input for unattended read-only runs.
• MCP exposes curated tools and requires explicit opt-in for mutations.
• External mail, calendar, contact, and file text can be wrapped with --wrap-untrusted for agent-safe consumption.
• Refresh tokens are stored in the OS keychain; access tokens are kept in memory only.

Read the security and privacy guide before connecting an agent or sharing logs.

Documentation

• Command reference
• Authentication and accounts
• Scripting and synchronization
• MCP and AI agents
• Security and privacy
• Enterprise app setup
• Development and releases
• Agent instructions

Contributing

make build
make test
make lint

See development and releases for repository structure, validation, CI, and publishing details.

License

See LICENSE.