Issues

• Org custom models on /chat/completions always fail with 400: CLI sends frequency_penalty/presence_penalty that providers reject (Google AI Studio, OpenAI-compatible)

  triage
  github/copilot-cli#5267 · Filter by author LucasMatuszewski opened on Oct 27, 2026

• ACP: a retried model call streams the failed attempt's partial answer, the retry notice as answer text, then the full answer

  triage
  github/copilot-cli#5266 · Filter by author doomslayer2k opened on Oct 27, 2026

• Input history (command-history-state.json) is last-writer-wins across concurrent copilot processes; prompts typed in one session are erased

  triage
  github/copilot-cli#5265 · Filter by author arimendelow opened on Oct 27, 2026

• Prompt is discarded after 'Submission failed' (host-ack timeout): composer cleared, not saved to history, delivered late or never

  triage
  github/copilot-cli#5264 · Filter by author arimendelow opened on Oct 27, 2026

• SessionClient poll loop keeps retrying after session disposal ("Cannot invoke native session after disposal has started"), leaking memory until heap OOM

  triage
  github/copilot-cli#5263 · Filter by author ctenberge-oneid opened on Oct 27, 2026

• Hooks: include the tool call id in preToolUse, postToolUse and postToolUseFailure input

  triage
  github/copilot-cli#5261 · Filter by author LoopGlitch26 opened on Oct 27, 2026

• Feature request: Monitor tool / stream background process output lines as notifications (avoid polling)

  area:tools
  Feature

  github/copilot-cli#5260 · Filter by author trodemaster opened on Oct 26, 2026

• P3 - container-runtime/copilot-runtime-bazel-cache-memory-usage-vs-limits-dotcom on catalog_service:copilot-runtime-bazel-cache,kube_cluster:dotcom-4-gc-cus-02,kube_container_name:copilot-runtime-bazel-cache,kube_deployment:copilot-r... - 2026-10-26T19:13Z

  catalog_service:copilot-runtime-bazel-cacheCRITICALsource:datadog
  github/copilot-cli#5259 · Filter by author github-internal-statuspage-new opened on Oct 26, 2026

• Copying in Copilot CLI 1.0.103 updates only tmux’s paste buffer on GNOME Terminal/X11; advertised OSC 52 support prevents working X11 fallback

  area:input-keyboardarea:platform-linux
  Bug

  github/copilot-cli#5258 · Filter by author PolyMMA opened on Oct 26, 2026

• Permission prompt truncates URLs with shell variable expansion (${VAR}), e.g. shows "https://api.$"

  area:permissions
  Bug

  github/copilot-cli#5257 · Filter by author pieterwillaert opened on Oct 26, 2026

• High CPU and repeated "gh auth token" failures when not signed in (worse without gh)

  area:authentication
  Bug

  github/copilot-cli#5256 · Filter by author nekrozis opened on Oct 26, 2026

• Windows: elevated session creates .mcp-writer.lock that non-elevated sessions cannot open (open_lock, os_error=5)

  area:mcparea:platform-windows
  Bug

  github/copilot-cli#5255 · Filter by author will-j-wright opened on Oct 26, 2026

• 1.0.103: main process grows to 37 GiB; 133M malloc allocations and 10.7 GiB fragmentation during long parallel-agent session

  area:agentsarea:sessions
  Bug

  github/copilot-cli#5254 · Filter by author MaxRink opened on Oct 25, 2026
  1

• CLI 1.0.103: persistent session-lock timeouts and unresponsive tasks amid host event acknowledgement failures

  area:agentsarea:sessionsmore-info-needed
  Bug

  github/copilot-cli#5253 · Filter by author MaxRink opened on Oct 25, 2026
  4

• Reduce fixed injected context per session: adaptive, non-duplicative tool/prompt loading

  area:context-memoryarea:tools
  Feature

  github/copilot-cli#5251 · Filter by author ercangorgulu-gembox opened on Oct 25, 2026

• macOS: Entra-broker MCP servers fail at startup: concurrent sign-ins rejected ("sign-in is already in progress") and rejected cached token not recovered

  area:authenticationarea:mcp
  Bug

  github/copilot-cli#5250 · Filter by author TqrHsn opened on Oct 25, 2026
  1

• PowerShell 7.6.8

  area:installationarea:platform-windows
  Bug

  github/copilot-cli#5247 · Filter by author gcapnias opened on Oct 23, 2026

• Editing prompt to start with ! traps user in Shell mode

  area:input-keyboard
  Bug

  github/copilot-cli#5246 · Filter by author HauserV opened on Oct 23, 2026

• No STT models behind a corporate proxy since 1.0.101 (Foundry runtime ignores proxy settings)

  area:networkingarea:platform-windows
  Bug

  github/copilot-cli#5245 · Filter by author corneschriekgenre opened on Oct 23, 2026

• Sub-agent detail view in /tasks does not allow expanding tool calls

  area:agentsarea:terminal-rendering
  Bug

  github/copilot-cli#5244 · Filter by author HauserV opened on Oct 23, 2026

• Subagents started in the same turn as an approved exit_plan_mode get none of the built-in tools (regression after 1.0.95)

  area:agents
  Bug

  github/copilot-cli#5243 · Filter by author kevinkwee opened on Oct 23, 2026

• Sessions stop processing when MCP config watch registration hits the inotify limit (ENOSPC)

  area:mcparea:non-interactivearea:platform-linuxmore-info-needed
  Bug

  github/copilot-cli#5242 · Filter by author godofwharf opened on Oct 23, 2026
  1

• Copilot app: selecting a custom agent in the composer agent picker doesn't apply its model or reasoning-effort

  area:agentsarea:models
  Bug

  github/copilot-cli#5241 · Filter by author RorroRojas3 opened on Oct 23, 2026

• repeated cache bust for every image after 50th

  area:context-memory
  Bug

  github/copilot-cli#5238 · Filter by author dss539 opened on Oct 22, 2026

• Installed plugin custom agent cancels its own HTTP MCP calls while default agent succeeds

  area:agentsarea:mcparea:plugins
  Bug

  github/copilot-cli#5237 · Filter by author JGruszczyk opened on Oct 22, 2026