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Backblaze B2 MCP Server MCP Server

Operate Backblaze B2 buckets, files, keys, Object Lock, and S3-compatible storage.

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

Pod has not dialled Backblaze B2 MCP Server yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

Connect

Published as @backblaze-labs/b2-mcp on npm. Runs locally.

{
  "mcpServers": {
    "backblaze-b2-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@backblaze-labs/b2-mcp"
      ]
    }
  }
}

Reviewed GitHub reports

33 GitHub reports passed Pod's relevance review. This can include external user reports, maintainer-confirmed bugs, and concrete feature gaps. It is evidence to inspect, not a count of distinct defects. Showing 12.

Most discussed

Support MCP 2026-07-28 stateless transport

Goal

Support the MCP 2026-07-28 stateless protocol and Streamable HTTP transport while preserving deliberate backward compatibility for older clients during the migration window.

Why

The 2026-07-28 MCP specification removes the initialize / initialized exchange, protocol-level sessions, the Mcp-Session-Id header, standalone GET streams, and DELETE session termination. Each request is self-describing and can be routed to any server instance.

The current B2 MCP server…

Read the thread · 2026-08-16 · closed · outside contributor · 2 comments

[b2-mcp] Submit to the Claude Connectors Directory (desktop-extension form)

List the official Backblaze B2 MCP server in Anthropic's Claude Connectors Directory. Part of the discoverability epic #297 (see also #300).

This is the one-time human submission process. The engineering that produces the artifact it needs lives in #358 (build + attach the b2-mcp.mcpb desktop-extension bundle on every release).

Path: Desktop Extension (MCPB)

b2-mcp is a local stdio server that each user runs themselves with their own B2 keys, so it is distributed as a…

Read the thread · 2026-09-03 · open · outside contributor · 1 comment

[b2-mcp] Discoverability: list in OpenAI ChatGPT App Directory (needs hosted OAuth deployment decision)

Track listing the Backblaze B2 MCP server in OpenAI's ChatGPT App Directory (Apps SDK).

Part of the discoverability epic #297 (see also #300).

Why this is a product decision, not just a submission

ChatGPT Apps run against a hosted, remote /mcp URL with OAuth 2.0. The plugin submission portal (OpenAI Platform Dashboard, verified org) requires a production HTTPS /mcp endpoint, domain verification, explicit CSP domains, OAuth auth, reviewer credentials, and 5 positive + 3…

Read the thread · 2026-09-02 · open · outside contributor · 1 comment

[v0.1.2 QA] Findings from Claude Desktop and Claude Code client sessions against live B2

Summary

I operated the MCP server against real B2 accounts through two MCP clients — Claude Desktop and Claude Code — and this issue groups the findings so they can be prioritized or re-scoped as needed. Each finding is filed as its own issue and linked below.

Both sessions ran the server on stdio, built from source at v0.1.2. Findings were re-verified against main (ce044ec) before filing; all nine are still present in current code.

Test environment

**Session A — Claude…

Read the thread · 2026-08-28 · closed · 1 comment

[b2-mcp] Add credential-free local MCP runtime smoke

Context

A fresh local Quality Keeper run found strong deterministic coverage: 1,482 test cases passed across unit, contract, protocol, package, compatibility, and security checks.

QK also selected runtime smoke testing and ran pnpm run smoke, but that command requires MCP_URL. With no deployed endpoint configured, it exited with Missing required env: MCP_URL.

That behavior is correct for the existing remote smoke. The remaining gap is a separate credential-free local startup smoke…

Read the thread · 2026-08-18 · closed · outside contributor · 1 comment

Most recent

[b2-mcp] Add Troubleshooting/FAQ to README (npx ENOTEMPTY cache crash) + robust install guidance

Problem

A user following the documented Claude Desktop npx -y @backblaze-labs/b2-mcp setup hit a hard startup failure that looks like a b2-mcp bug but is actually a corrupted/stale npm _npx cache. The server reached server.ready (36 tools) and was then killed by npm's own cache-cleanup step:

npm error code ENOTEMPTY
npm error syscall rmdir
npm error path /Users/<user>/.npm/_npx/<hash>/node_modules/@aws-sdk/nested-clients/dist-es
npm error errno -66
npm error ENOTEMPTY: directory…

[Read the thread](https://github.com/backblaze-labs/b2-mcp/issues/371) · 2026-09-02 · open · outside contributor · 0 comments

### [b2-mcp] Credential-free tool discovery on both transports (unblock Glama release; stop scanner hacks)

## Problem

The server cannot be **tool-enumerated without valid B2 credentials** on either transport, which blocks credential-free directory scanners (Glama's containerized build test/inspection, and any MCP inspector) and forces ugly per-directory workarounds (`unset`, `B2_REGISTER_ALL_TOOLS`, editing the advertised env schema).

This surfaced trying to create a Glama **release** (containerized build → security scan → one-click deploy → A grade). Glama's build test *starts the server and…

[Read the thread](https://github.com/backblaze-labs/b2-mcp/issues/363) · 2026-09-02 · closed · outside contributor · 0 comments

### server: stdio should enumerate tools without credentials (discovery mode)

## Problem
Directory services (mcp.so, Glama build test, LobeHub `plugin init`) launch the stdio server with **no B2 credentials** to enumerate tools. Today `loadConfig()` throws `missing_credentials` and the process exits(1):

MCP error -32000: Connection closed ({"err":"Credential or capability resolution failed","msg":"server.fatal"})


So `tools/list` never runs and directories show "No tools detected". The only workaround is placeholder creds + `B2_REGISTER_ALL_TOOLS=true`, which…

[Read the thread](https://github.com/backblaze-labs/b2-mcp/issues/356) · 2026-09-01 · closed · outside contributor · 0 comments

### [QA F20] stdio bootstrap capability fetch can deadlock the MCP handshake

**Describe the bug**

<!-- Clear, concise description. Do NOT include B2 application keys or any credential values. -->

`startStdio()` awaits `fetchCapabilities()` — a live B2 authorize — before the transport is attached and before the first log line is written. Verified on `main` (`ce044ec`): `src/index.ts:48` awaits `fetchCapabilities(config)`; `serveStdio()` is only reached at `src/index.ts:64`.

The SDK retry budget is 4 attempts x 30s plus backoff (~127s); MCP clients cancel `initialize`…

[Read the thread](https://github.com/backblaze-labs/b2-mcp/issues/320) · 2026-08-28 · closed · 0 comments

### [QA F19] b2_egress_leaders reports a measured zero when no usage-report snapshots exist

**Describe the bug**

<!-- Clear, concise description. Do NOT include B2 application keys or any credential values. -->

When Usage Reports is enabled but no report snapshots exist yet, `b2_egress_leaders` reports `total_egress_gb: 0` with an empty leaderboard and no qualification of any kind. "No data has been collected" and "your egress was genuinely zero" are returned as the same answer, and the model passes the zero on as a fact.

Its sibling `b2_usage_growth`, reading the same reports on…

[Read the thread](https://github.com/backblaze-labs/b2-mcp/issues/319) · 2026-08-28 · closed · 0 comments

### [QA F16] Audit log cannot distinguish a model-supplied confirm from a human approval

**Describe the bug**

<!-- Clear, concise description. Do NOT include B2 application keys or any credential values. -->

#134 kept the `confirm` parameter *"for clients without elicitation and for the audit trail."* The audit-trail half does not currently work: a `confirm: true` supplied by the model and one supplied by a human are **indistinguishable after the fact** in the `tool.call` records.

The classification is already correct — #203 delivered stable `destructive_confirmation_required` /…

[Read the thread](https://github.com/backblaze-labs/b2-mcp/issues/318) · 2026-08-28 · closed · 0 comments

### [QA F15] The confirm fallback is satisfied by the model on clients without elicitation (follow-up to #134)

**Describe the bug**

<!-- Clear, concise description. Do NOT include B2 application keys or any credential values. -->

**This is not a request to remove the `confirm` fallback.** #134 explicitly designed it that way — *"the current `confirm: true` parameter is model-satisfiable (a prompt-injected model can set it), so it is a deliberate two-step and audit point, not real human consent"* — and its scope of work says to *"keep the `confirm: true` fallback for clients without elicitation."*…

[Read the thread](https://github.com/backblaze-labs/b2-mcp/issues/317) · 2026-08-28 · closed · 0 comments

[See all 21 reports Pod holds for Backblaze B2 MCP Server](/mcp/backblaze-b2-mcp-server/issues) — of 33 qualified upstream.

## Firsthand observations

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