Backblaze B2 MCP Server
name (io.github.backblaze-labs/b2-mcp) and repo path, so they activate automatically. Its 40 documented tools cover bucket, multipart, group, account. It runs locally over stdio via the published package.
People who work with bucket, multipart and group and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.
VERIFIED ACTIVE
LAST COMMIT 2026-09-14 · ★ 36 · #14 OF 81 MAINTAINED DATA & ANALYTICS · VERIFIED 2026-09-18
MIT · TypeScript servers · how we verify → /methodology
01 · Install Backblaze B2 MCP Server
before you install - you'll need
Set B2_APPLICATION_KEY_ID, B2_APPLICATION_KEY, B2_MCP_VERSION, B2_MCP_IMAGE, B2_HTTP_CREDENTIAL_MODE, B2_ALLOWED_HOSTS, B2_REGISTER_ALL_TOOLS, B2_SECRET_SINK, B2_ALLOW_INLINE_SECRETS, B2_ALLOW_LOCAL_FILES before connecting. B2_DESTRUCTIVE_POLICY is optional or environment-specific per the README.
Claude Code
claude mcp add backblaze-labs-b2-mcp -- npx -y @backblaze-labs/b2-mcpClaude Desktop / Cursor / VS Code - add to config
{
"mcpServers": {
"backblaze-labs-b2-mcp": {
"command": "npx",
"args": [
"-y",
"@backblaze-labs/b2-mcp"
]
}
}
}Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.
Using another client? Same JSON, different key
Claude Desktop · mcpServers
Cursor · mcpServers
VS Code · servers
Windsurf · mcpServers
Zed · context_servers
Cline · mcpServers
Roo Code · mcpServers
Continue · mcpServers
LibreChat · mcpServers
Gemini CLI · mcpServers
Codex CLI · mcp_servers
Full setup guides: every client.
02 · Evidence
Security posture
What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.
runs as local process (stdio) - runs on your machine with your user's permissions
license MIT - declared in the repository
npm package @backblaze-labs/b2-mcp - published under the repo owner's npm scope (@backblaze-labs)
registry namespace io.github.backblaze-labs is GitHub-verified and matches the repo owner
03 · What Backblaze B2 MCP Server can do
Prose above is summarized from the project's README and registry record - no invented capabilities.
What you can build
With this server connected, an agent can verify credentials and return account info, list buckets (optional filters), create a persistent bucket with initial policy settings, and delete an empty bucket.
Capability map
Tools grouped from the project's README - what Backblaze B2 MCP Server lets an agent do.
Bucket
8 tools - e.g. Create a persistent bucket with initial policy settings; Delete an empty bucket; Update persistent bucket settings; risky changes are gated
b2_create_bucket · b2_delete_bucket · b2_update_bucket · b2_get_bucket_notification_rules · b2_set_bucket_notification_rules · s3_head_bucket…
Object
6 tools - e.g. Inline upload of a small (≤1 MiB) control-plane object; Inline download of a small (≤1 MiB) control-plane object; Delete current object or exact version; destructive gate applies
s3_put_object · s3_get_object · s3_delete_object · s3_head_object · s3_copy_object · s3_list_object_versions
Multipart
4 tools - e.g. Begin a multipart upload; Complete multipart upload from ordered part ETags; Abort a multipart upload
s3_create_multipart_upload · s3_complete_multipart_upload · s3_abort_multipart_upload · s3_list_multipart_uploads
Group
3 tools - e.g. Remove a member from a partner group (Partner API credential); List group members (Partner API credential); Create a Partner group member (Partner API credential)
b2_eject_group_member · b2_list_group_members · b2_create_group_member
Key
2 tools - e.g. Irreversibly revoke an application key; Create a scoped application key through the configured secret sink
b2_delete_key · b2_create_key
File
2 tools - e.g. Set/clear legal hold on an object; Set/clear retention on an object
b2_update_file_legal_hold · b2_update_file_retention
Objects
2 tools - e.g. Bulk-delete objects; List objects
s3_delete_objects · s3_list_objects_v2
Presigned
2 tools - e.g. Mint a presigned PUT URL for a part; Short-lived presigned PUT/GET bearer URL
s3_get_presigned_upload_part_url · s3_get_presigned_url
Latest releases
v0.2.1 · 2026-09-04
@backblaze-labs/b2-mcp v0.2.1 · Added · glama.json repo-root maintainer manifest for the Glama org server claim, · plus a README Glama score badge. (#300) · lhm.plugin.json LobeHub marketplace manifest and a README…
v0.2.0 · 2026-09-02
add harness foundation · add Anthropic Haiku 4.5 driver · add OpenAI provider comparison · cover full tool profile · gated CI workflow and pass-rate artifact · EVALS.md - running the LLM eval suite · consolidate…
v0.1.2 · 2026-08-23
@backblaze-labs/b2-mcp v0.1.2 · Changed · Renamed the outbound User-Agent product token from backblaze-b2-mcp to · b2-mcp (b2-mcp/<version> on a published release, b2-mcp/dev otherwise) · across every SDK that talks to…
04 · Who maintains Backblaze B2 MCP Server
Backblaze B2 MCP Server is maintained by backblaze-labs. It's the only MCP server we track from this author; the repo dates to May 2026.
05 · Facts
- repository
- github.com/backblaze-labs/b2-mcp
- category
- data & analytics - ranked #14 of 81 actively-maintained data & analytics servers as of 2026-09-18.
- release cadence
- 5 releases in the last 90 days (latest 2026-09-04)
- registry
- io.github.backblaze-labs/b2-mcp (active, first published 2026-09-01 · 2 versions)
- packages
- npm:@backblaze-labs/b2-mcp
06 · Backblaze B2 MCP Server FAQ
Is Backblaze B2 MCP Server still maintained?
Yes - as of 2026-09-18, its last commit was 2026-09-14 and it shipped 5 releases in the last 90 days. We re-verify nightly.
What can Backblaze B2 MCP Server do?
With this server connected, an agent can verify credentials and return account info, list buckets (optional filters), create a persistent bucket with initial policy settings, and delete an empty bucket.
How do I install Backblaze B2 MCP Server?
Run `npx -y @backblaze-labs/b2-mcp`. The README documents 11 environment variables (B2_APPLICATION_KEY_ID, B2_APPLICATION_KEY, B2_MCP_VERSION…) to set first. Set B2_APPLICATION_KEY_ID, B2_APPLICATION_KEY, B2_MCP_VERSION, B2_MCP_IMAGE, B2_HTTP_CREDENTIAL_MODE, B2_ALLOWED_HOSTS, B2_REGISTER_ALL_TOOLS, B2_SECRET_SINK, B2_ALLOW_INLINE_SECRETS, B2_ALLOW_LOCAL_FILES before connecting. B2_DESTRUCTIVE_POLICY is optional or environment-specific per the README. You can also paste the ready-made client config above.
Does Backblaze B2 MCP Server run locally?
Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.
07 · Alternatives to Backblaze B2 MCP Server
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