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claude-code - 💡(How to fix) Fix [BUG] master is incorrectly assumed as main branch name instead of reading from repo [1 comments, 2 participants]

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anthropics/claude-code#56056•Fetched 2026-05-05 05:59:21
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet (at least it not obviously in the search results for open issues including "master")
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

The main branch is assumed to be named master in the session context that is provided to the model, regardless of what the repository's actual default branch is called, leading to incorrect suggestions (e.g. git checkout master).

What Should Happen?

Expected behavior: Any work steps involving the repo's main branch should work out of the box using the actually correct default branch's name. It should be read from the repo initially, and probably stored in MEMORY.md

Steps to Reproduce

  1. Have a git repository whose default branch is not master (e.g. named development)
  2. Open a new Claude Code session in that repository
  3. Ask Claude something like "what is the main branch of this repo?" or attempt a branch operation that references
    the main branch
  4. Observe that Claude refers to master instead of the actual default branch name

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Claude Code Version

2.1.126

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

Why this matters beyond correctness: Hardcoding master as an assumed default also reflects an outdated convention. The industry has broadly moved away from this term due to its association with the master/slave metaphor, with GitHub, GitLab, and others defaulting to main since 2020. Baking master into the tooling as an assumption implicitly treats it as the norm, which is worth reconsidering regardless of the correctness issue. (Generated by Claude ;) )

extent analysis

TL;DR

Update the session context to dynamically retrieve the default branch name from the repository instead of assuming it as "master".

Guidance

  • Verify the repository's default branch name is correctly identified by checking the repository settings or using a Git command like git remote show origin.
  • Modify the session context to store the actual default branch name, potentially by reading it from the repository initially and storing it in MEMORY.md as suggested.
  • Update the code to use the stored default branch name instead of hardcoding "master" for branch operations.
  • Consider adding a configuration option to allow users to specify the default branch name if it cannot be automatically determined.

Example

No code snippet is provided as the issue does not include specific code details, but the solution would involve updating the session context and branch operation logic to use the dynamically retrieved default branch name.

Notes

The solution may require changes to the Claude Code model or the Anthropics API to support dynamic retrieval of the default branch name. The industry shift away from using "master" as the default branch name due to its association with the master/slave metaphor should be considered when implementing the fix.

Recommendation

Apply a workaround by updating the session context to use the actual default branch name, as the issue is not clearly tied to a specific version that can be upgraded to fix the problem. This approach allows for a more flexible and accurate solution that adapts to the repository's actual configuration.

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claude-code - 💡(How to fix) Fix [BUG] master is incorrectly assumed as main branch name instead of reading from repo [1 comments, 2 participants]