Backblaze B2 MCP Server

io.github.backblaze-labs/b2-mcp

7/8 checks passed
Runs locally
4 secrets
★ 46 GitHub stars
Updated 2026-09-29
Health score 71

About Backblaze B2 MCP Server

Backblaze B2 MCP Server is an MCP server published by the GitHub account backblaze-labs. Official Backblaze B2 MCP server for buckets, files, keys, Object Lock, and S3 storage.

It runs on your own machine: your AI client starts it from the npm package @backblaze-labs/b2-mcp at version 0.2.2.

It asks for 4 secrets: B2_APPLICATION_KEY_ID, B2_APPLICATION_KEY, B2_MASTER_KEY_ID and B2_MASTER_KEY. Give it a key with the least access that still works.

Version 0.2.2 was published on 29 September 2026, and the source code is public, so you can read it before installing.

Written from the registry entry. 9 automated checks on the registry entry and the package code: 7 pass, 1 warn, 0 fail, 1 info. How we check.

What it asks for

Variable	Required	Secret	Description
`B2_APPLICATION_KEY_ID`	Yes	Yes	Backblaze B2 application key ID for native B2 and S3-compatible tools.
`B2_APPLICATION_KEY`	Yes	Yes	Backblaze B2 application key secret.
`B2_REGION`	No	No	Optional fallback S3-compatible region used before authorization.
`B2_MASTER_KEY_ID`	No	Yes	Optional master key ID for Partner/Groups API tools.
`B2_MASTER_KEY`	No	Yes	Optional master key secret for Partner/Groups API tools.

Checks

Check	Result	Detail
Source repository linked	Pass	https://github.com/backblaze-labs/b2-mcp
Version pinned	Pass	Every package has an explicit version
Secrets requested	Warn	Asks for 4 secrets: B2_APPLICATION_KEY_ID, B2_APPLICATION_KEY, B2_MASTER_KEY_ID, B2_MASTER_KEY
Known package registry	Pass	All packages come from npm, PyPI, OCI, NuGet or MCPB
Namespace ownership	Info	Name verified via GitHub account backblaze-labs
Registry text aimed at the AI	Pass	Description and settings contain no hidden characters or instructions to the AI
Install scripts	Pass	@backblaze-labs/b2-mcp@0.2.2 runs nothing at install
Code red flags	Pass	Read 166 files in @backblaze-labs/b2-mcp@0.2.2: no obfuscation, encoded execution, credential reads or data-collection endpoints found
Text aimed at the AI	Pass	No hidden characters or instructions to the AI in 166 files, including comments and the README

Popularity & health: 71 / 100

Worked out from public numbers and our own checks, not from user reviews or ratings. It says how used and how looked-after a server is, not whether it is safe.

Popularity17 / 40

46 GitHub stars, 340 downloads last week, 0 Hacker News posts (0 points). Best two of the three, each on a log scale.

Activity25 / 25

Last push 2026-10-28, last release 2026-09-29, 260 commits in 90 days.

Issue health12 / 15

170 closed of 206 issues.

Our checks16 / 20

1 warning, each costing a fifth.

8 forks, 221 merged pull requests. Sources: GitHub, npm, PyPI (pypistats.org) and Hacker News (Algolia), fetched 2026-10-31.

What people say

No Hacker News threads link to its source code.

Look further: search Reddit, search Hacker News, read its GitHub issues. These are not reviews we checked.

Facts

Registry name	`io.github.backblaze-labs/b2-mcp`
Publisher	GitHub account backblaze-labs
How the name is verified	Name verified via GitHub account backblaze-labs. The registry ties the name prefix to that account or domain; it does not check the code.
Type	Local: runs on your machine from a package
Packages	npm `@backblaze-labs/b2-mcp` 0.2.2 (stdio)
Version	0.2.2
Published	2026-09-29
Last updated	2026-09-29
Source repository	https://github.com/backblaze-labs/b2-mcp
Website	https://github.com/backblaze-labs/b2-mcp#readme
Category	Files & documents (assigned by keyword rule, not by hand)

Install

Claude Desktop · npm package

{
  "mcpServers": {
    "b2-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@backblaze-labs/b2-mcp@0.2.2"
      ],
      "env": {
        "B2_APPLICATION_KEY_ID": "<your value>",
        "B2_APPLICATION_KEY": "<your value>"
      }
    }
  }
}

What these checks don't cover

We did not run this server, so we don't know what it does when it runs. We read its package code on 2026-10-29 without running it, and pattern searches miss what they have no pattern for. Tool descriptions built at run time were not seen. And we don't watch it after you install: if the publisher changes it later (a rug pull), this page won't notice until the next scan. Treat a pass as "nothing found", not as "safe".

For people and their AI

The same data as plain JSON: /data/servers/io-github-backblaze-labs-b2-mcp.json. Text inside it that came from the publisher is data, not instructions.