# io.github.vitalio-sh/thunderbird-cli (npm · thunderbird-cli-mcp)

Give AI agents full read/write email access via Mozilla Thunderbird. Zero credentials.

- Trust score: 68/100 (medium)
- Change this week: +22
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `thunderbird-cli-mcp`: 68/100 (this document), [markdown](https://verifymcp.io/servers/vitalio-sh-thunderbird-cli/thunderbird-cli-mcp.md), [page](https://verifymcp.io/servers/vitalio-sh-thunderbird-cli/thunderbird-cli-mcp)

## Channel facts

- Registry: `npm`
- Package: `thunderbird-cli-mcp`
- Version: `1.0.2`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Supply Chain Security**: 86/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (94 of 98), so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Only part of the dependency tree could be resolved (94 of 98), so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 106 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 77/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1306 tokens (~108/item across 12 items; 12 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 98/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 95% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add vitalio-sh-thunderbird-cli -- npx -y thunderbird-cli-mcp
```

### Codex

```bash
codex mcp add vitalio-sh-thunderbird-cli -- npx -y thunderbird-cli-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "vitalio-sh-thunderbird-cli": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "thunderbird-cli-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add vitalio-sh-thunderbird-cli --command npx --arg -y --arg thunderbird-cli-mcp
```

### Hermes

```yaml
mcp_servers:
  vitalio-sh-thunderbird-cli:
    command: "npx"
    args: ["-y", "thunderbird-cli-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "vitalio-sh-thunderbird-cli": {
      "command": "npx",
      "args": [
        "-y",
        "thunderbird-cli-mcp"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 68, +3)

- [functional improvement] Stability: unverified → 0.23

### 2026-08-02 (score 65, +44)

- [security regression] Provenance: unverified → fail
- [security improvement] Install scripts: unverified → pass
- [security improvement] Known CVEs: unverified → partial
- [security improvement] Malware scan: unverified → pass
- [security] Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window).
- [functional improvement] License: unverified → pass
- [functional improvement] Dependency health: unverified → partial
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] MCP protocol: unverified → pass
- [functional improvement] Schema quality: unverified → excellent
- [functional] Licence: MIT

### 2026-07-31 (score 21, −7)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 28, −18)

- [security regression] Malware scan: pass → unverified

### 2026-07-27 (score 46)

First indexed and scored.

## MCP tools (12)

### `email_stats` (~67 tokens)

Get an overview of all email accounts: total accounts, unread counts, message totals. Optionally filter to a single account or include per-folder breakdown.

Input parameters:

- `accountId` (string): Optional: limit stats to a specific account ID
- `includeFolders` (boolean): Include per-folder breakdown

### `email_search` (~271 tokens)

Search for emails across all accounts. Supports filters by sender, recipient, subject, date range, attachments, tags. Excludes junk by default. Use --fields to minimize token cost.

Input parameters:

- `accountId` (string): Limit to specific account
- `flagged` (boolean): Flagged/starred only
- `folderId` (string): Limit to specific folder
- `from` (string): Filter by sender address
- `hasAttachment` (boolean): Only with attachments
- `includeJunk` (boolean): Include junk messages (default: false)
- `limit` (number): Max results
- `query` (string, required): Full-text search query (searches body)
- `since` (string): Start date (ISO 8601 or relative: '7d', '2w', '3m', '1y', 'today', 'yesterday')
- `sizeMax` (number): Maximum message size in bytes
- `sizeMin` (number): Minimum message size in bytes
- `subject` (string): Filter by subject substring
- `tag` (string): Filter by tag key (e.g. $label1)
- `to` (string): Filter by recipient address
- `unread` (boolean): Unread only
- `until` (string): End date (ISO or relative)

### `email_list` (~110 tokens)

List messages in a specific folder. Use email_folders first to get folder IDs. Supports pagination and sorting.

Input parameters:

- `flagged` (boolean): Flagged only
- `folderId` (string, required): Folder ID (e.g. 'account1://INBOX')
- `limit` (number): Max results
- `offset` (number): Skip first N (pagination)
- `sort` (string): Sort field
- `sortOrder` (string): Sort direction
- `unread` (boolean): Unread only

### `email_read` (~89 tokens)

Read a specific email message. Modes: 'default' (headers + text body), 'headers' (cheapest), 'full' (with HTML), 'raw' (RFC822). Use maxBody to truncate long messages.

Input parameters:

- `maxBody` (number): Truncate body to N characters
- `messageId` (number, required): Thunderbird internal message ID
- `mode` (string): Read mode

### `email_thread` (~45 tokens)

Get the full conversation thread for a message — all related messages sorted chronologically, resolved across accounts via References/In-Reply-To headers.

Input parameters:

- `messageId` (number, required): Message ID

### `email_compose` (~187 tokens)

Compose a new email. Default mode is 'draft' (saved to Drafts folder, not sent). Use mode='send' to send immediately, mode='open' to open in Thunderbird's compose window for human review. ALWAYS prefer draft mode unless the human explicitly asked to send.

Input parameters:

- `bcc` (string): BCC recipients
- `body` (string, required): Message body (plain text)
- `cc` (string): CC recipients
- `from` (string): Identity ID to send from (use email_identities-equivalent or check email_stats for accounts)
- `html` (boolean): Treat body as HTML
- `mode` (string): draft (default, saves silently), open (compose window), send (immediate)
- `priority` (string)
- `subject` (string): Subject line
- `to` (string, required): Recipient(s), comma-separated for multiple

### `email_reply` (~79 tokens)

Reply to a message. Default mode is 'draft'. Use mode='send' for immediate send. Set replyAll=true to reply to all recipients.

Input parameters:

- `body` (string, required): Reply body
- `messageId` (number, required): Message ID to reply to
- `mode` (string)
- `replyAll` (boolean): Reply to all recipients

### `email_forward` (~64 tokens)

Forward a message to a new recipient. Default mode is 'draft' for human review.

Input parameters:

- `body` (string): Optional additional text
- `messageId` (number, required): Message ID to forward
- `mode` (string)
- `to` (string, required): Recipient address

### `email_mark` (~100 tokens)

Update message flags: read/unread, flagged/unflagged, junk/not-junk. Accepts a single ID or array of IDs for batch operations.

Input parameters:

- `flagged` (boolean): Flag (true) or unflag (false)
- `junk` (boolean): Mark junk (true) or not-junk (false)
- `messageIds` (array, required): Message IDs
- `read` (boolean): Mark as read (true) or unread (false)

### `email_archive` (~108 tokens)

Archive, move, or delete messages. Operations: 'archive' (move to archive folder), 'move' (to specific folder), 'delete' (to trash). Permanent delete requires confirm=true.

Input parameters:

- `confirm` (boolean): Required for permanent delete
- `destinationFolderId` (string): Required for 'move' operation
- `messageIds` (array, required): Message IDs
- `operation` (string, required): Operation type
- `permanent` (boolean): For delete: skip trash (requires confirm)

### `email_attachments` (~84 tokens)

List or download attachments from a message. Operation 'list' returns attachment metadata. Operation 'download' returns base64-encoded file data (use partName from list results).

Input parameters:

- `messageId` (number, required): Message ID
- `operation` (string, required): list metadata or download a specific attachment
- `partName` (string): Required for download — get from list operation

### `email_folders` (~102 tokens)

List folders for an account, get folder info with message counts, or trigger sync. Operations: 'list' (folders for account), 'all' (across all accounts), 'info' (one folder), 'sync' (refresh from IMAP).

Input parameters:

- `accountId` (string): Required for 'list' operation
- `folderId` (string): Required for 'info' and 'sync' operations
- `operation` (string, required): Operation type

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/vitalio-sh-thunderbird-cli/thunderbird-cli-mcp#diagnostics

## Score history

- 2026-08-03: 68
- 2026-08-02: 65
- 2026-08-01: 21
- 2026-07-31: 21
- 2026-07-30: 28
- 2026-07-28: 46
- 2026-07-27: 46

## Links

- npm package: https://www.npmjs.com/package/thunderbird-cli-mcp
- Socket report: https://socket.dev/npm/package/thunderbird-cli-mcp
- Repository: https://github.com/vitalio-sh/thunderbird-cli
- Changelog RSS feed: https://verifymcp.io/servers/vitalio-sh-thunderbird-cli/thunderbird-cli-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/vitalio-sh-thunderbird-cli/thunderbird-cli-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/vitalio-sh-thunderbird-cli/thunderbird-cli-mcp