## Summary
- refresh git auth headers before each per-crash iteration in
`background_agent_mvp`
- add guarded `git fetch`/`git checkout` handling so one candidate auth
failure doesn’t fail the entire run

## Context
- fixes the auth failure seen in workflow run 22106378719 (`fatal: could
not read Username for 'https://github.com'`)
- related Linear issue: BIZOPS-853

## Testing
- ruby -e "require 'yaml';
YAML.load_file('.github/workflows/background_agent_mvp.yml')"

Release Notes:

- N/A

Release Notes:

- N/A

Before this PR we wouldn't always serialize workspaces when a
mutliworkspace adds/removes a workspace. This PR fixes this by adding a
test and calling serialization in remove

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A

Add `remove_worktree()` and `rename_worktree()` to the `GitRepository`
trait with `RealGitRepository` implementations that shell out to `git
worktree remove/move`.

Implement all 4 worktree methods (`worktrees`, `create_worktree`,
`remove_worktree`, `rename_worktree`) on `FakeGitRepository` backed by
`FakeGitRepositoryState`, with `simulated_create_worktree_error` for
test-time fault injection.

Add `set_create_worktree_error()` helper on `FakeFs`.

Add `parse_worktrees_from_str` helper and 7 new tests covering real git
operations and fake worktree lifecycle.

Closes AI-31

Release Notes:

- N/A

## Before

<img width="1596" height="230" alt="repro"
src="https://github.com/user-attachments/assets/d96d9bc4-cc46-4c11-8ac8-0051a1a51316"
/>

## After

<img width="1000" height="800" alt="error_message_wrapping"
src="https://github.com/user-attachments/assets/7553607a-2cbf-414d-9794-dbd6f3b0f9eb"
/>


Previously, error message text was overflowing and getting clipped
instead of wrapping when displaying long error messages (e.g. rate limit
errors in the agent panel).

Closes AI-38

Release Notes:

- Fixed long error messages (e.g. rate limit errors) being clipped
instead of wrapping in the agent panel.

This PR updates the `Agent Thread Rated` event to be routed through
Cloud instead of the normal telemetry pipeline.

Closes CLO-223.

Release Notes:

- N/A

Closes #ISSUE

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [ ] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Improved the behavior of the `vim: join lines` and `editor: join lines`. Comment and other language specific line prefixes are now stripped from the join line

Switches `newline_below` from adding a newline to the start of the next
line in a multibuffer, to appending a newline at the end of the
selections current lines. This keeps the insertion within the excerpt of
the selection rather than adding a newline to the excerpt below.

Closes #47965

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Fixed `editor::NewlineBelow` adding a newline to the next multibuffer
excerpt when selection is at the end of an excerpt

Add Kanayago as an available Ruby language server in default settings.
Disabled by default (prefixed with `!`), users can opt-in via their
settings.

This corresponds to the extension-side support added in
zed-extensions/ruby#224.

Release Notes:

- ruby: Added Kanayago as an available language server.

Release Notes:

- N/A

This brings the runtime down to logarithmic scaling of excerpts / linear
scaling of tokens.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Reverts the editor's paragraph navigation behavior that was changed in
#47734. Whitespace-only lines are now treated as paragraph boundaries
again for non-vim mode users.

Vim mode retains its own implementation where only truly empty lines
are paragraph boundaries.

Release Notes:

- Fixed editor paragraph navigation to treat whitespace-only lines as
paragraph boundaries again

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: dino <dinojoaocosta@gmail.com>

Release Notes:

- N/A

Release Notes:

- N/A

Also fixes batches upload

Release Notes:

- N/A

Update based on
https://platform.claude.com/docs/en/agent-sdk/overview#branding-guidelines

ACP package will be updated shortly.

Release Notes:

- acp: Claude Code is now referred to as Claude Agent, per Anthropic
branding guidelines.

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A

Release Notes:

- Improved Bedrock error messages: region-locked models ask the user to
try a different region, rate limits and access errors are reported
cleanly instead of as raw API responses
- Streamlined Bedrock model list to 39 curated models
- Fixed API errors when using non-tool models in agent threads

---------

Co-authored-by: Ona <no-reply@ona.com>

It now creates multi-turn conversation, where first two messages are the
original teacher prompt and output.

This way, we'll have changes in teacher prompt automatically applied to
repair without having to explicitly sync them.


Release Notes:

- N/A

Release Notes:

- N/A

Closes #49081

Release Notes:

- N/A

Other changes:
- Changed tokenization to more code-aware tokenization from split-commit
- Fixed word-diff implementation which was inefficient and sometimes
incorrect

Release Notes:

- N/A

Release Notes:

- N/A

Closes #49067

See https://github.com/zed-industries/notify/pull/2 for more details

Note: notify already fixed this upstream, and I'm planning on using
their crate as our dependency once their v9 is officially released.

Release Notes:

- Fix panic that could occur when navigating external code

## Summary
- add a new crash issue-linking subagent prompt
(`.factory/prompts/crash/link-issues.md`)
- add a scheduled/manual GitHub workflow for week-one background-agent
runs (`.github/workflows/background_agent_mvp.yml`)
- add Sentry candidate selection script to rank top crashes by
solvability × population (`script/select-sentry-crash-candidates`)
- add a local dry-run runner for end-to-end MVP execution without
push/PR actions (`script/run-background-agent-mvp-local`)

## Guardrails in this MVP
- draft PRs only (no auto-merge)
- reviewer routing defaults to: `eholk,morgankrey,osiewicz,bennetbo`
- pipeline order is: investigate -> link-issues -> fix

## Validation
- `python3 -m py_compile script/select-sentry-crash-candidates
script/run-background-agent-mvp-local`
- `python3 script/select-sentry-crash-candidates --help`
- `python3 script/run-background-agent-mvp-local --help`

---------

Co-authored-by: John D. Swanson <swannysec@users.noreply.github.com>

This PR adds the list of the user's organizations to the `UserStore`.

Closes CLO-292.

Release Notes:

- N/A

Our strategy for keeping excerpts in sync between the two sides of the
split diff is generally

- mutate the excerpts on the RHS
- pull out the new excerpts for the affected path from the RHS
- translate those ranges to the LHS
- update the LHS excerpts with those ranges

But this can break down when the translated ranges overlap on the LHS
despite the original ranges not overlapping on the RHS. This can happen,
for example, when a large deletion in a file crosses several excerpt
boundaries. It's rare because normally excerpt boundaries in the project
diff and branch diff are adjusted to keep entire diff hunks in view, but
we defer this for dirty files, so it's not hard to trigger it when using
the agent or editing an individual file while the diff is open in
another tab.

Release Notes:

- Fixed a panic that could occur when editing files while the project
diff or branch diff was open.

---------

Co-authored-by: Zed Zippy <234243425+zed-zippy[bot]@users.noreply.github.com>

Release Notes:

- N/A

Closes #49172

- Fixes a regression on X11 where content size was divided by the scale
factor twice after the wgpu migration, causing half-sized rendering on
HiDPI screens.
- Aligns X11 [content_size()] behavior with Wayland by returning logical
pixel bounds directly.

Video :
[Screencast from 2026-02-14
18-58-36.webm](https://github.com/user-attachments/assets/cf4edf3b-7b93-4ded-bf46-e900be44b22b)


Release Notes:

- N/A

Closes #ISSUE

Before you mark this PR as ready for review, make sure that you have:
- [x ] Added a solid test coverage and/or screenshots from doing manual
testing
- [ x] Done a self-review taking into account security and performance
aspects
- [x ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Release Notes:

- N/A

This PR removes some code left over from how we used to do impersonation
for local development.

The local development impersonation path is separate now, so we don't
need all of this plumbing in Collab.

Release Notes:

- N/A

This PR removes the `GET /rpc_server_snapshot` endpoint from Collab, as
it is not being used (and also didn't seem to be functional).

Release Notes:

- N/A

This PR removes the `POST /users/:id/access_tokens` endpoint from
Collab, as it is no longer used.

Closes CLO-290.

Release Notes:

- N/A

Re-lands https://github.com/zed-industries/zed/pull/48891, which was
reverted due to conflicts with multi-workspace.

Before you mark this PR as ready for review, make sure that you have:
- [X] Added a solid test coverage and/or screenshots from doing manual
testing
- [X] Done a self-review taking into account security and performance
aspects

Release Notes:

- N/A

This PR makes it so we install the necessary Linux dependencies for the
Collab deployment workflow.

Release Notes:

- N/A

This PR updates the Collab deployment workflow to be generated with
`cargo xtask workflows`.

Release Notes:

- N/A

This PR fixes the naming of the `WorkflowType::ExtensionCi` variant to
match Rust naming conventions.

Release Notes:

- N/A

This PR removes the two remaining steps in the Collab deployment
workflow to Namespace runners.

The previous `runs-on` labels were no longer functional.

Release Notes:

- N/A

This PR adds a button in the Git Panel to open the `git: branch diff`
view. The button only shows if the staging area is clean/no changes and
if the branch is not main/master. I've been using this action so much
these days and we should expose it on the UI so it's more discoverable.

<img width="500" height="1736" alt="Screenshot 2026-02-16 at 6  30@2x"
src="https://github.com/user-attachments/assets/0b037811-2167-419f-b63f-9bdb12e4352e"
/>

Release Notes:

- N/A

Release Notes:

- Fixed sticky headers sometimes disappearing when dealing with expanded
deleted diff hunks

Release Notes:

- Fixed an incorrect hover label for read-only file lock buttons

Second attempt at fixing
https://github.com/zed-industries/zed/pull/49047, this also removes some
of the sorting hacks as they should ideally not be necessary anymore
after this fix

Release Notes:

- N/A *or* Added/Fixed/Improved ...

This change improves performance of project diff in that:
* scrolling in split view for very large diffs (think chromium repo with
`git reset HEAD~1000`) is now very smooth on macOS and fairly smooth on
Linux
* switching from split to unified is very smooth on macOS, and fairly
smooth on Linux

There still remains the case of (severe) hangs when switching from
unified to split however, but it will be addressed in a follow-up PR.

Anyhow, here's the screenshot of the Instruments.app capture of opening
chromium repo in Zed in split view, scrolling a little, moving to
unified, scrolling some more, and moving back to split. Prior to this
change, split -> unified would cause a severe hang, whereas now it's a
hang and thus feels much smoother already (without Instruments profiling
is barely visible). Unified -> split severe hangs are still there but
don't last as long.

<img width="2301" height="374" alt="Screenshot 2026-02-16 at 5 46 23 PM"
src="https://github.com/user-attachments/assets/f687f8d4-cffd-47f1-ada1-f6c4d3ac3cd4"
/>

Release Notes:

- Improved project diff performance when opening very large
diffs/repositories.

Before:
<img width="726" height="86" alt="indentation-problem"
src="https://github.com/user-attachments/assets/50330c66-26ac-4cb0-9f26-8ee73ec6c64d"
/>

After:
<img width="811" height="102" alt="after"
src="https://github.com/user-attachments/assets/8704bd83-b626-4b6d-8ff9-50edd6f065db"
/>

Release Notes:

- Fixed indentation problem with multi-line declarations and assignments
in C++

---------

Co-authored-by: ozacod <ozacod@users.noreply.github.com>

Fix broken links in themes docs

Release Notes:

- N/A

### Description

Related Discussions: #44499, #35742, #31851

Display cost multiplier for GitHub Copilot models in the model selectors
(Both in Chat Panel and Inline Assistant)

<img width="436" height="800" alt="image"
src="https://github.com/user-attachments/assets/c9ebd8fa-4d55-4be8-b3e1-f46dbf1f0145"
/>


### Some technical notes

Although this PR's primary intent is to show the cost multiplier for
GitHub Copilot models alone, I have included some necessary plumbing to
allow specifying costs for other providers in future. I have introduced
an enum called `LanguageModelCostInfo` for showing cost in different
ways for different models. Now, this enum is used in `LanguageModel`
trait to get the cost info.

For now to begin with, in `LanguageModelCostInfo`, I have specified two
ways of pricing: Request-based (1 Agent request - GitHub Copilot uses
this) and Token-based (1M Input tokens / 1M Output tokens). I had
initially thought about adding a `Free` type, especially for Ollama but
didn't do it after realizing that Ollama has paid plans. Right now, only
the Request-based pricing is implemented and used for Copilot models.

Feel free to suggest changes on how to improve this design better.

Release Notes:

- Show cost multiplier for GitHub Copilot models

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

This PR removes the `cloud-thinking-effort` feature flag to ship the
thinking effort UI for the Zed provider.

Release Notes:

- Added support for controlling thinking effort levels with supported
models using the Zed provider.

It is possible, when the agent is streaming the tool call, that we will
get a permission request on an existing terminal and we need to render
that.

When Zed controls the terminal this won't happen, but when we are just
rendering the output, it can happen and we need to show it.

Release Notes:

- agent: Fix permission options not rendering on terminal commands

Bedrock Converse API requires toolConfig whenever messages have tool use
or result blocks. PR #33174 handled the case where tools are defined but
tool_choice is None. This change addresses another case: the tools array
is empty (e.g. thread summarisation) but messages still have tool blocks
from conversation history. A placeholder tool satisfies the requirement.

Testing:

Tested manually by:
1. Starting a conversation with Bedrock that uses tools
2. Triggering thread summarisation
3. Confirming summarisation now succeeds instead of failing with an API
error

Release Notes:

- Fixed Bedrock thread summarization failing when conversation had tools