Claude Code / AI Coding Tools

Claude Code v2.1.141 MCP OAuth browser launch broken on Windows Git Bash

Fix MCP OAuth authentication flow where Claude Code fails to launch browser for Atlassian, DataDog, Slack, SourceGraph integrations on Windows with Git Bash + SSH Includes evidence for Claude Code troubleshooting demand.

Source-backed Last updated May 23, 2026 1 source Needs local verification

Category: AI Coding Tools
Error signature: mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate
Quick fix: Verify the account session, API key, provider settings, and environment where the failing tool is running.
Updated: May 23, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Claude Code, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate is a Claude Code failure pattern reported for developers trying to fix mcp oauth authentication flow where claude code fails to launch browser for atlassian, datadog, slack, sourcegraph integrations on windows with git bash + ssh. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub Issue #59194 on anthropics/claude-code (open, bug + regression label, platform:windows). Regression introduced in v2.1.141 — auto-updated on 2026-05-14. Browser-open logic no longer falls back to cmd.exe /c start when BROWSER is unset and DISPLAY empty in Git Bash/MSYS2 under SSH/PLink context. Clear work-around available but affects paying pro/teams users doing daily MCP auth.

Common causes

GitHub Issue #59194 on anthropics/claude-code (open, bug + regression label, platform:windows). Regression introduced in v2.1.141 — auto-updated on 2026-05-14. Browser-open logic no longer falls back to cmd.exe /c start when BROWSER is unset and DISPLAY empty in Git Bash/MSYS2 under SSH/PLink context. Clear work-around available but affects paying pro/teams users doing daily MCP auth.

Quick fixes

Confirm the exact error signature matches mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate.
Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
Verify the account session, API key, provider settings, and environment where the failing tool is running.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate exactly before applying the quick fix.
Compare the failing environment with Claude Code versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate mean in Claude Code?

mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate indicates the workflow described by "Claude Code v2.1.141 MCP OAuth browser launch broken on Windows Git Bash" failed in a AI Coding Tools context. Start by confirming the exact signature and the component that emitted it.

What should I check first for mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate?

Check whether this cause matches your environment: GitHub Issue #59194 on anthropics/claude-code (open, bug + regression label, platform:windows). Regression introduced in v2.1.141 — auto-updated on 2026-05-14. Browser-open logic no longer falls back to cmd.exe /c start when BROWSER is unset and DISPLAY empty in Git Bash/MSYS2 under SSH/PLink context. Clear work-around available but affects paying pro/teams users doing daily MCP auth.

Is the mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate guidance source-backed?

The "Claude Code v2.1.141 MCP OAuth browser launch broken on Windows Git Bash" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate?

For "Claude Code v2.1.141 MCP OAuth browser launch broken on Windows Git Bash", avoid applying "Verify the account session, API key, provider settings, and environment where the failing tool is running." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging mcp auth not automatically launching browser on Windows — no errors, just no activity after clicking Authenticate?

For "Claude Code v2.1.141 MCP OAuth browser launch broken on Windows Git Bash", collect the failing Claude Code command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.