v1.15.9

anomalyco/opencodev1.15.9May 22, 2026by opencode-agent[bot]

AI Summary

This release introduces a redesigned diff viewer with file tree, enables it by default, and adds clearer error handling throughout the application along with session status in the title bar.

Key Highlights

Redesigned diff viewer with file tree and refreshed layout
Diff viewer enabled by default
Added clearer errors for invalid models, PTY sessions, skill invocations, and installation upgrades
Session status shown in title bar
Tab navigation moved into title bar
MCP OAuth configs support callback port and scopes

New Features

Diff viewer with file tree
Session status in title bar
Tab navigation in title bar
MCP OAuth callback port and scopes

Full Release Notes

## Core

### Improvements

- Redesigned the diff viewer with a file tree and refreshed layout.

### Bugfixes

- Return to the previous screen when closing the diff viewer.
- Show clearer errors when a default model is invalid or unavailable.
- Surface missing PTY session errors instead of failing generically.
- Improve diff viewer empty states and context handling.
- Show clearer errors when a skill invocation fails as expected.
- Show clearer errors when an installation upgrade fails.
- Show clearer project not found errors from the HTTP API.
- Return PTY error bodies from the HTTP API.
- Enable the diff viewer by default.
- Return MCP server not found errors from the HTTP API.
- Let MCP OAuth configs set a callback port and include configured scopes in client metadata. (@sebin)
- Use working Vertex Anthropic endpoints for `us` and `eu` multi-region setups. (@JPFrancoia)
- Return session busy error bodies from the HTTP API.
- Preserve native reasoning continuation metadata across turns.

## TUI

### Improvements

- Copy the current worktree path from the command palette.

### Bugfixes

- Refine diff viewer keyboard shortcuts.
- Restore question prompt key handling.
- Keep the spinner color aligned with the active agent. (@OpeOginni)

## Desktop

### Improvements

- Move tab navigation into the title bar and tighten session tab shortcuts.
- Show session status in the title bar.

### Bugfixes

- Extract user codes correctly from callback URLs that contain multiple colons. (@OpeOginni)
- Debounce VCS refreshes to reduce session page churn.

**Thank you to 4 community contributors:**
- @vglafirov:
  - chore(deps): bump gitlab-ai-provider to 6.7.0 (#28218)
- @OpeOginni:
  - fix(opencode): update spinner color logic (#28032)
  - fix(desktop): correct user code extraction when URL contains colons (#28837)
- @JPFrancoia:
  - fix(vertex): Vertex (Antropic) provider: use .rep.googleapis.com for continental multi-region endpoints (us, eu) (#28347)
- @sebin:
  - fix(mcp): include scope in clientMetadata and add callbackPort option (#28810)