Tools2026-09-26 · source-backed

Copilot CLI 1.0.89-4 fixes Gemini models 400-ing on every request when an MCP tool schema puts `type` or `properties` beside `anyOf`.

Issue

2026-09-26

Confidence

source-backed

Sources

Redaction

passed

Story

The September 25 prerelease fixes a case where any connected MCP server exposing a nullable discriminated union broke every Gemini-backed request. MCP server authors should flatten those schemas. The build also fixes wrapped commands like timeout 60 gh ... in sandboxed sessions.

Source trail

The September 25 prerelease More from github.com

Entities

Copilot CLI Gemini MCP

Provenance

Canonical issue: Ramsay Research Agent — September 26, 2026
AI generated: no
Story unit: 2026-09-26-copilot-cli-1-0-89-4-fixes-gemini-models-400-ing-on-every-request-when-an-mcp-tool-schema-puts-t
Labels: source-backed, canonical briefing excerpt

Fetching from the wire…

Copilot CLI 1.0.89-4 fixes Gemini models 400-ing on every request when an MCP tool schema puts `type` or `properties` beside `anyOf`.

Story

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Source trail

Entities

Provenance

Copilot CLI 1.0.89-4 fixes Gemini models 400-ing on every request when an MCP tool schema puts `type` or `properties` beside `anyOf`.

Story

Related stories

Copilot CLI's ACP, AHP-host and `--server` sessions had been running with no enterprise policy at all.

Agno 3.0.1 stops response time from scaling with chat length

Agent Plugins 1.0 went GA — and a lab outside the authoring group shipped support the same week

agentmemory puts a dollar figure on memory architecture: ~$10/year vs ~$500/year.

The Claude Code Field Guide Hit 53,400 Stars. Here's Why That Matters.

Kaku forks WezTerm into a terminal whose defaults assume you're running coding agents.

Source trail

Entities

Provenance

Story

Related stories

Copilot CLI's ACP, AHP-host and `--server` sessions had been running with no enterprise policy at all.

Agno 3.0.1 stops response time from scaling with chat length

Agent Plugins 1.0 went GA — and a lab outside the authoring group shipped support the same week

agentmemory puts a dollar figure on memory architecture: ~$10/year vs ~$500/year.

The Claude Code Field Guide Hit 53,400 Stars. Here's Why That Matters.

Kaku forks WezTerm into a terminal whose defaults assume you're running coding agents.

Tomorrow's issue, in your inbox.

Source trail

Entities

Provenance

Story

Related stories

Copilot CLI's ACP, AHP-host and `--server` sessions had been running with no enterprise policy at all.

Agno 3.0.1 stops response time from scaling with chat length

Agent Plugins 1.0 went GA — and a lab outside the authoring group shipped support the same week

agentmemory puts a dollar figure on memory architecture: ~$10/year vs ~$500/year.

The Claude Code Field Guide Hit 53,400 Stars. Here's Why That Matters.

Kaku forks WezTerm into a terminal whose defaults assume you're running coding agents.

Tomorrow's issue, in your inbox.

Source trail

Entities

Provenance