Official Backblaze B2 MCP server for buckets, files, keys, Object Lock, and S3 storage.
Connect Runs on your machine
claude mcp add b2-mcp -e B2_APPLICATION_KEY_ID=<B2_APPLICATION_KEY_ID> -e B2_APPLICATION_KEY=<B2_APPLICATION_KEY> -e B2_REGION=<B2_REGION> -e B2_MASTER_KEY_ID=<B2_MASTER_KEY_ID> -e B2_MASTER_KEY=<B2_MASTER_KEY> -- npx -y @backblaze-labs/[email protected]{
"mcpServers": {
"b2-mcp": {
"command": "npx",
"args": [
"-y",
"@backblaze-labs/[email protected]"
],
"env": {
"B2_APPLICATION_KEY_ID": "<B2_APPLICATION_KEY_ID>",
"B2_APPLICATION_KEY": "<B2_APPLICATION_KEY>",
"B2_REGION": "<B2_REGION>",
"B2_MASTER_KEY_ID": "<B2_MASTER_KEY_ID>",
"B2_MASTER_KEY": "<B2_MASTER_KEY>"
}
}
}
}{
"mcpServers": {
"b2-mcp": {
"command": "npx",
"args": [
"-y",
"@backblaze-labs/[email protected]"
],
"env": {
"B2_APPLICATION_KEY_ID": "<B2_APPLICATION_KEY_ID>",
"B2_APPLICATION_KEY": "<B2_APPLICATION_KEY>",
"B2_REGION": "<B2_REGION>",
"B2_MASTER_KEY_ID": "<B2_MASTER_KEY_ID>",
"B2_MASTER_KEY": "<B2_MASTER_KEY>"
}
}
}
}{
"servers": {
"b2-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@backblaze-labs/[email protected]"
],
"env": {
"B2_APPLICATION_KEY_ID": "<B2_APPLICATION_KEY_ID>",
"B2_APPLICATION_KEY": "<B2_APPLICATION_KEY>",
"B2_REGION": "<B2_REGION>",
"B2_MASTER_KEY_ID": "<B2_MASTER_KEY_ID>",
"B2_MASTER_KEY": "<B2_MASTER_KEY>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
B2_APPLICATION_KEY_IDRequired, secret | Backblaze B2 application key ID for native B2 and S3-compatible tools. |
B2_APPLICATION_KEYRequired, secret | Backblaze B2 application key secret. |
B2_REGIONOptional | Optional fallback S3-compatible region used before authorization. |
B2_MASTER_KEY_IDOptional, secret | Optional master key ID for Partner/Groups API tools. |
B2_MASTER_KEYOptional, secret | Optional master key secret for Partner/Groups API tools. |
Details
| Package | @backblaze-labs/[email protected] (NPM, stdio) |
| First published | 29 Sep 2026 |
| Last updated | 29 Sep 2026 |
| Registry name | io.github.backblaze-labs/b2-mcp |
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