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Proposals/Upgrade OpenCode to v1.18.11 and retest MCP SSE
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Upgrade OpenCode to v1.18.11 and retest MCP SSE plus interleaved-reasoning models

v1.18.11 stops MCP SSE reconnect loops after server errors and fixes provider configs that use interleaved reasoning fields like reasoning_text. Upgrade, then verify MCP stability and reasoning-model output.

Why this loop

This release directly unblocks two coding-assistant failure modes: MCP SSE clients that spun forever after error responses, and provider model configs whose interleaved reasoning fields (e.g. reasoning_text or custom names) were mishandled. Teams using MCP servers or reasoning-capable models should upgrade promptly and confirm those paths work, rather than keeping workarounds for stuck reconnects or broken reasoning field parsing. Desktop fixes (system-browser external links, session tab state, file tree clipping, debug gutter alignment) improve day-to-day reliability but the MCP and model-config fixes are the highest-leverage workflow wins.

Proposed actions

  1. Upgrade OpenCode to v1.18.11 (or later) on every machine that runs MCP servers or reasoning-capable provider models.
  2. For each configured MCP server over SSE: restart OpenCode, trigger a deliberate server error response once, confirm the client does not stay in a reconnect loop, then verify normal tool calls succeed again.
  3. For any provider model config that uses interleaved reasoning fields (reasoning_text or a custom field name): send a short multi-step reasoning prompt and confirm reasoning and final answer both render correctly with no missing or concatenated fields.
  4. If you use the Modal provider, follow the new Modal provider setup docs added in this release and save a working provider config in your OpenCode settings.
  5. On OpenCode Desktop after upgrade: open an external docs link (should launch the system browser), resize the file tree smaller (should not clip), and confirm the title-bar session tab matches the active session.

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# DevAgentRadar → Claude Code

You are helping me adopt a real coding-assistant change. Work only from the facts below. Do not invent features.

## Context
Assistant: OpenCode
Proposal: Upgrade OpenCode to v1.18.11 and retest MCP SSE plus interleaved-reasoning models
Summary: v1.18.11 stops MCP SSE reconnect loops after server errors and fixes provider configs that use interleaved reasoning fields like reasoning_text. Upgrade, then verify MCP stability and reasoning-model output.
Primary source: https://github.com/anomalyco/opencode/releases/tag/v1.18.11

## Why it matters
This release directly unblocks two coding-assistant failure modes: MCP SSE clients that spun forever after error responses, and provider model configs whose interleaved reasoning fields (e.g. reasoning_text or custom names) were mishandled. Teams using MCP servers or reasoning-capable models should upgrade promptly and confirm those paths work, rather than keeping workarounds for stuck reconnects or broken reasoning field parsing. Desktop fixes (system-browser external links, session tab state, file tree clipping, debug gutter alignment) improve day-to-day reliability but the MCP and model-config fixes are the highest-leverage workflow wins.

## Suggested actions
1. Upgrade OpenCode to v1.18.11 (or later) on every machine that runs MCP servers or reasoning-capable provider models.
2. For each configured MCP server over SSE: restart OpenCode, trigger a deliberate server error response once, confirm the client does not stay in a reconnect loop, then verify normal tool calls succeed again.
3. For any provider model config that uses interleaved reasoning fields (reasoning_text or a custom field name): send a short multi-step reasoning prompt and confirm reasoning and final answer both render correctly with no missing or concatenated fields.
4. If you use the Modal provider, follow the new Modal provider setup docs added in this release and save a working provider config in your OpenCode settings.
5. On OpenCode Desktop after upgrade: open an external docs link (should launch the system browser), resize the file tree smaller (should not clip), and confirm the title-bar session tab matches the active session.


## Your job
1. Restate the change in one sentence.
2. Propose a minimal plan for my repo (or a throwaway pilot).
3. Implement only what I approve; prefer small diffs and tests.
4. Call out risks (permissions, breaking APIs, cost).

Start by confirming you understood the proposal.
mcpmodelRelease source ↗

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Originating release signal

OpenCodev1.18.11Aug 1, 2026

v1.18.11

Stopped MCP SSE connections from getting stuck in reconnect loops after server error responses. · Fixed provider model configs that use interleaved reasoning fields like `reasoning_text` or custom field names. · Open external links in the system browser instead of inside the app. · Fixed stale session tab state in the desktop title bar. (@OpeOginni) · Open the legacy directory picker at your home folder when no home path is loaded yet. · Prevent the file tree tab from clipping when resized smaller. (@OpeOginni) · Fixed debug gutter labels and values misaligning. · +7 more changes

Verified excerpt — the source's own words
## Core

### Bugfixes

- Stopped MCP SSE connections from getting stuck in reconnect loops after server error responses.
- Fixed provider model configs that use interleaved reasoning fields like `reasoning_text` or custom field names.

## Desktop

### Bugfixes

- Open external links in the system browser instead of inside the app.
- Fixed stale session tab state in the desktop title bar. (@OpeOginni)
- Open the legacy directory picker at your home folder when no home path is loaded yet.
- Prevent the file tree tab from clipping when resized smaller. (@OpeOginni)
- Fixed debug gutter labels and values misaligning.

**Thank you to 2 community contributors:**
- @devennavani:
  - docs: add Modal provider setup (#39710)
- @OpeOginni:
  - fix(app): prevent file tree tab clipping (#39770)
  - fix(app): prevent stale session tab reads (#39767)
  - fix(app): prevent stale prompt control reads (#39842)
Primary source ↗