Claude Session URL appended to commit messages and PR descriptions by default

TL;DR Highlight

Claude Code adds session URLs to commits and PRs by default, and users want it opt-in

Who Should Read

A developer surprised to find claude.ai session links in git commits and PRs created with Claude Code

Core Mechanics

Session links land at the bottom of commits and PRs
- Claude Code automatically appends a https://claude.ai/code/session_... link to commit messages and PR descriptions.
- The issue author says there was no onboarding prompt or warning.
The ask was to make it opt-in
- Proposals include a one-time onboarding prompt or a first-commit prompt with a "don't add this again" option.
- Another alternative was to drop the link and keep only the Co-Authored-By trailer.
There is a setting to turn it off
- Put "sessionUrl": false under attribution in ~/.claude/settings.json to drop the link.
- This keeps the Co-Authored-By trailer intact.
attribution.commit set to empty did not work
- The issue and one commenter reported that attribution.commit = "" alone did not remove the link.
- A commenter suggested the CLAUDE_CODE_SUPPRESS_SESSION_ATTRIBUTION=1 environment variable.

Community Reactions

Some want the link on by default
- One commenter sees coworkers' PRs with session links and says they can still control who can view the session.
- Another wrote a script early on to append session IDs to commits, and says it helps when debugging old commits.
Linkrot worries
- One commenter doubts these links will still work in 30 years.
- Another prefers linking to an open format stored in the repo, since git should be self-contained.
The problem is the rollout, not the feature
- One commenter says it's a good default for new users but should not have been turned on for existing users without a prompt.
- Another says Anthropic often ships default-on features via auto-update, so they are considering switching harnesses.
A concrete way to turn it off
- One commenter says the env variable was added in CC 2.1.202 on July 8, 2026.
- They also added a rule to ~/.claude/CLAUDE.md saying never to add Co-Authored-By or any reference to Claude in commits, and it works.

How to Apply

Add sessionUrl false to settings.json
- Open ~/.claude/settings.json today and add "sessionUrl": false under attribution.
- Set commit and pr to empty strings too if you want those texts gone.
- If it still appears, set CLAUDE_CODE_SUPPRESS_SESSION_ATTRIBUTION to "1" under env.
Commit the setting in repos used via web or Remote Control
- Web sessions don't keep your home settings, so commit the same attribution block in the repo's .claude/settings.json.
- Add this file to your new-repo template.
Review the commit message before pushing
- Tell Claude to draft a commit message and not commit until you review it.
- Before pushing, run git log -1 --format=%B and check the last lines for a Claude-Session trailer.
Write your attribution rules in CLAUDE.md
- Spell out in the project CLAUDE.md how AI involvement should be marked, such as whether links are allowed or an Assisted-by line.
- Include the exact format for anything you want recorded instead of the session link.

Try It

copy & run

# Paste into the Claude Code terminal (settings check prompt)

Read ~/.claude/settings.json and this repo's .claude/settings.json.
Check whether attribution.sessionUrl is set to false in both.

If not, propose merging the block below without deleting existing settings. Do not modify any file until I approve.
{ "attribution": { "commit": "", "pr": "", "sessionUrl": false } }

Also use git log to check whether the last 5 commit messages end with a Claude-Session trailer or a claude.ai/code/session_ link, and tell me.

Next to try: after changing settings, make a test commit and verify the link is gone. If not, add CLAUDE_CODE_SUPPRESS_SESSION_ATTRIBUTION=1 under env and retry.

Terminology

attributionA Claude Code feature that marks commits and PRs as involving Claude. Think of it as a name tag for a collaborator.

Co-Authored-By trailerA git convention line at the end of a commit message naming a co-author. Like a co-author credit on a book cover.

Remote ControlA feature for operating a Claude Code session remotely. The issue says session links are added in these sessions.

opt-in / opt-outOpt-in means the feature is off until the user turns it on. Opt-out means it is on by default and the user must turn it off.

linkrotWhen links die over time and stop opening. Like a note with an address of a place that no longer exists.