email-drafts

Email Drafts

Create, edit, and manage email drafts. Each draft is stored as an application state entry keyed compose-{id}. The UI refreshes through the framework polling/query invalidation path and updates the compose panel automatically.

Storage

Drafts are stored in the application_state SQL table via writeAppState("compose-{id}", draft) from @agent-native/core/application-state. Each entry is one draft. Multiple drafts can exist simultaneously — they appear as tabs in the compose panel.

Schema

{
  "id": "abc123",
  "to": "recipient@example.com",
  "cc": "",
  "bcc": "",
  "subject": "Meeting follow-up",
  "body": "Hi team,\n\nThanks for the great discussion today...",
  "mode": "compose",
  "replyToId": "",
  "replyToThreadId": ""
}

Fields

Body Formatting

The body field uses markdown. The compose editor (TipTap) renders it as rich text, and the send flow converts markdown to HTML before sending via Gmail. Use standard markdown syntax:

• Links: [click here](https://example.com) — renders as a clickable hyperlink in the sent email
• Bold: **bold text**
• Italic: *italic text*
• Lists: - item (unordered) or 1. item (ordered)
• Headings: # Heading (h1–h3)
• Code: `inline code` or fenced code blocks
• Blockquotes: > quoted text
• Bare URLs: https://example.com auto-links

Do NOT use raw HTML tags — use markdown only.

Signature and Style Settings

Before creating or rewriting a draft, read the user's drafting settings with pnpm action get-mail-settings.

• Use signature exactly when it is configured; do not rewrite or duplicate it.
• If no signature is configured, omit the signature. Never derive one from the user's name, email address, or connected profile.
• Follow writingStyle when present.
• Keep generated copy natural and specific. Avoid generic AI email tropes, headings, and over-formal filler unless the user asks for that style.

How It Works

1. Write writeAppState("compose-{id}", draft) — the shared application state row changes
2. UI polling sees the change — invalidates the compose-drafts React Query cache
3. Compose panel re-renders — shows the updated draft as a tab, switches to it if new

The compose panel opens automatically when any compose draft exists. When the last draft is deleted, the panel closes.

Use the manage-draft action, not raw writeAppState

manage-draft is the real action surface for compose drafts (action: create | update | delete | delete-all). Prefer it over hand-writing compose-{id} state directly — it does things a raw write will not:

• Sanitizes the id. IDs must match /^[a-zA-Z0-9_-]{1,64}$/ (sanitizeDraftId); an invalid id on create silently falls back to a timestamp-based id instead of failing.
• Appends the signature automatically on create via appendSignatureToBody(body, signature), reading the configured signature from mail-settings. This is idempotent (no-ops if the signature text is already in the body) and signature-aware of quoted content — it inserts the signature before any — On ... wrote: or — Forwarded message — block, not after it. update does NOT re-append the signature — only create does, so edit calls should not need to touch the signature themselves.
• Returns a deepLink (via link()) that opens the exact draft in the real Mail compose UI (embedApp/mcpApp resource with contact autocomplete, attachments, and send controls) — surface this link when running outside the first-party UI (e.g. from an MCP host).

pnpm action manage-draft --action=create --to=jane@example.com --subject="Quick question" --body="Hi Jane,\n\nJust wanted to follow up on..."
pnpm action manage-draft --action=update --id=draft1 --body="Hi Jane,\n\nI refined the draft as requested..."
pnpm action manage-draft --action=delete --id=draft1
pnpm action manage-draft --action=delete-all

Listing All Drafts

pnpm action view-composer

Or from code:

import { listAppState } from "@agent-native/core/application-state";
const drafts = await listAppState("compose-");

Attaching Files

The send-email action accepts an optional attachments array. Each entry must reference a file that was previously uploaded via the media-upload endpoint (/api/media/upload). Pass the server-side filename (the key returned by the upload endpoint, e.g. abc123.pdf), and optionally originalName (display name for the recipient) and mimeType. The attachment plumbing resolves the file from data/uploads/ or from the configured file-storage URL recorded by the upload endpoint, then includes it as a MIME multipart attachment in the outgoing Gmail message. Do not store or paste attachment bytes, base64, or data: URLs in draft state/settings; files are never sent speculatively — only attach what the user has explicitly provided and confirmed.

Local files from an MCP host

A hosted Mail app cannot read a path on the MCP host's local filesystem. Use create-attachment-upload with the file's display name. It returns a five-minute, owner-bound uploadUrl, a PUT method, and the attachment handle Mail expects. From the local host, upload the raw bytes directly:

curl --fail-with-body --request PUT --header '<Authorization header>' --data-binary @/absolute/path/to/report.pdf '<uploadUrl>'

Use the response's attachment object in the draft/send request. The upload Authorization header is a short-lived bearer credential: do not log, persist, reuse, or share it. Creating or consuming it does not send mail. Keep send-email behind its normal explicit-intent and human-approval gate; for drafting, pass the handle through ask_app or open the returned compose deep link.

Example:

{
  "to": "recipient@example.com",
  "subject": "Q2 Report",
  "body": "Please find the report attached.",
  "attachments": [
    { "filename": "abc123.pdf", "originalName": "Q2-Report.pdf", "mimeType": "application/pdf" }
  ]
}

Attachments are resolved eagerly, before Gmail is touched: if any referenced upload can't be read, send-email throws immediately (nothing is sent) rather than sending a partial message. If you see that error, the fix is re-uploading via the media endpoint, not retrying the same filename.

What Actually Happens on Send

send-email requires explicit user intent to send — it is needsApproval: true and pauses for human approval before the real Gmail call happens. It branches on whether the user has a connected Google account:

• Connected: resolves an access token (refreshing if the account's expiry_date is within 60s), resolves reply threading (inReplyTo / References headers) by fetching the original message metadata when replyToId is set, resolves the sender display name via resolveGoogleSenderIdentity (caching the result), builds the raw MIME message, and calls the real Gmail send API.
• Not connected (no Google account): synthesizes a fake sent message and appends it to the user's local-emails setting so the UI still shows a "Sent" item — this is a demo/fallback path, not a queued real send. Do not tell the user the email left their real inbox in this mode.
• Open/click tracking: if mail-settings.tracking.opens or .clicks is enabled, send-email rewrites the outgoing body with a tracking pixel and per-link click tokens before building the MIME message, and persists the token map keyed by the real Gmail message id. get-tracking --id=<messageId> reads back open count and per-link click stats for a previously sent message; it returns tracked: false (not an error) for messages that were sent before tracking was enabled or when tracking is off.
• Multiple connected Google accounts: send-email's optional account param picks the sender; when replying, it also tries each connected account until one can fetch the original message, and uses that account as the sender if account wasn't explicit.

Important Notes

• The id field in the JSON MUST match the {id} in the key name (compose-{id})

• The UI debounces writes by 300ms — if the user is actively typing, your write will be visible after a brief moment

• Always use valid JSON with proper escaping (especially newlines in body: use \n)

• Multiple drafts can exist simultaneously — each appears as a tab in the compose panel

• When the user asks you to "draft" or "compose" an email, write a compose entry — don't use the send API directly

• When the user asks you to "edit" or "improve" a draft, list drafts first, then read and update the relevant one

• When called from the compose Generate button: the context tells you which draft to update (e.g. compose-abc123). Always update THAT entry — do NOT create a new one with a different ID. Read, modify, and write back to the same key.

• When drafting from scratch (no compose window open): create a new entry with any unique ID

• The id field in the JSON MUST match the {id} in the key name (compose-{id})

• The UI debounces writes by 300ms — if the user is actively typing, your write will be visible after a brief moment

• Always use valid JSON with proper escaping (especially newlines in body: use \n)

• Multiple drafts can exist simultaneously — each appears as a tab in the compose panel

• When the user asks you to "draft" or "compose" an email, write a compose entry — don't use the send API directly

• When the user asks you to "edit" or "improve" a draft, list drafts first, then read and update the relevant one

• When called from the compose Generate button: the context tells you which draft to update (e.g. compose-abc123). Always update THAT entry — do NOT create a new one with a different ID. Read, modify, and write back to the same key.

• When drafting from scratch (no compose window open): create a new entry with any unique ID