Copilot Chat runs for several minutes, generates thousands of lines, then silently stops with no UI error

[Cyrus-DropPrint]

🏷️ Discussion Type

Bug

💬 Feature/Topic Area

VS Code

Body

Disclaimer: This is written by Ai, as I don't fully understand the issue. Essentially, my chats randomly stop with no error in the UI, usually after 5-20 minutes in agent mode.
I’m seeing a consistent issue with Copilot Chat where requests will run for 5–10 minutes, often generate a few thousand lines of output, and then abruptly stop with no error message shown in the UI.
The only visible result in the UI is that the response stops. There is no red error, no warning, and no indication that anything failed.
After inspecting logs, here’s what appears to be happening:

What’s happening

The model (Claude Opus / GPT‑4o‑mini) starts normally and generates large amounts of content.
When the agent transitions from reasoning to tool execution, Copilot validates the tool schemas.
All tools fail validation with warnings like:

Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'

Because none of the tools register successfully, the agent has no valid next step.
Copilot then ends the request cleanly with finish reason: stop.

Importantly, this failure is not surfaced in the UI at all. From the user’s perspective, the request simply stops after several minutes, even though it is a hard failure.

What we think is causing it

Copilot’s tool runtime appears to support only a restricted subset of JSON Schema.
Specifically, top‑level oneOf, allOf, and anyOf are not supported, even though they are valid JSON Schema.
This limitation is not clearly documented.
Tools are rejected at runtime, but agents that depend on them continue running until they hit tool usage, causing late, silent termination.

What this is not

Not a timeout
Not a token limit
Not prompt length
Not a model failure
Not incorrect JSON Schema (schemas are valid)
Not user misconfiguration

Questions

Is the lack of UI error intentional when tool schemas fail validation?
Is there documentation for the supported JSON Schema subset for Copilot tools?
Are there plans to either support oneOf / allOf / anyOf, or surface a clear blocking error when tools are rejected?

Posting this because the delayed failure combined with no UI error makes this very difficult to diagnose. This has led to me having to use 5+ premium requests per message when this happens.

Full logs: 2026-04-03 10:51:38.505 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:51:38.505 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:38.505 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:51:38.505 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:43.946 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:51:43.970 [info] ccreq:eb640ad6.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 5465ms | [panel/editAgent]
2026-04-03 10:51:44.378 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:44.378 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:51:44.378 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:44.379 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:51:44.379 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:47.801 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:51:47.824 [info] ccreq:bebe1c15.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 3444ms | [panel/editAgent]
2026-04-03 10:51:48.040 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:48.040 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:51:48.040 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:48.040 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:51:48.040 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:51.366 [info] message 0 returned. finish reason: [stop]
2026-04-03 10:51:51.369 [info] request done: requestId: [ac7a885d-0f47-45ec-a6e4-2e74ddbb16fa] model deployment ID: []
2026-04-03 10:51:51.370 [info] ccreq:249c4877.copilotmd | success | gpt-4o-mini -> gpt-4o-mini-2024-07-18 | 484ms | [copilotLanguageModelWrapper]
2026-04-03 10:51:51.836 [info] message 0 returned. finish reason: [stop]
2026-04-03 10:51:51.839 [info] request done: requestId: [6d9f0a69-c1b9-467c-9a85-df29fd9196ec] model deployment ID: []
2026-04-03 10:51:51.840 [info] ccreq:5897696e.copilotmd | success | gpt-4o-mini -> gpt-4o-mini-2024-07-18 | 483ms | [copilotLanguageModelWrapper]
2026-04-03 10:51:55.027 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:51:55.032 [info] ccreq:02b8be60.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 33553ms | [tool/runSubagent]
2026-04-03 10:51:55.042 [info] [ToolCallingLoop] Subagent stop hook result: shouldContinue=false, reasons=undefined
2026-04-03 10:51:55.107 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:55.107 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:51:55.107 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:51:55.107 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:51:55.108 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:52:03.507 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:52:03.525 [info] ccreq:1ebcc69f.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 8416ms | [panel/editAgent]
2026-04-03 10:52:03.588 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:52:03.588 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:52:03.588 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:52:03.588 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:52:03.588 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:56:19.392 [warning] [ChatSessionWorkspaceFolderService][getWorkspaceChanges] No repository properties found for session 5342afb0-53ae-46bb-9413-56799e37233a
2026-04-03 10:57:32.982 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:57:42.976 [info] ccreq:86a2ea9c.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 339386ms | [panel/editAgent]
2026-04-03 10:57:45.995 [info] Fetched model metadata in 426ms 8974b33a-d808-4055-abc2-698330c762b6
2026-04-03 10:57:46.075 [info] ccreq:23a768a9.copilotmd | markdown
2026-04-03 10:57:46.131 [info] Dropped current selection (12285 / 12285 tokens)
2026-04-03 10:57:46.275 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:57:46.275 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:57:46.275 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:57:46.275 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:57:46.275 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:57:46.598 [info] message 0 returned. finish reason: [stop]
2026-04-03 10:57:46.600 [info] request done: requestId: [a395d522-c943-45b6-bc3e-4c8876ebaad5] model deployment ID: []
2026-04-03 10:57:46.601 [info] ccreq:29334067.copilotmd | success | gpt-4o-mini -> gpt-4o-mini-2024-07-18 | 433ms | [copilotLanguageModelWrapper]
2026-04-03 10:58:26.164 [info] ccreq:ddaae4a0.copilotmd | cancelled | claude-opus-4.6 | 39894ms | [panel/editAgent]
2026-04-03 10:58:26.871 [info] Dropped current selection (12285 / 12285 tokens)
2026-04-03 10:58:27.223 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:27.224 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:58:27.224 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:27.224 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:58:27.224 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:33.572 [info] message 0 returned. finish reason: [stop]
2026-04-03 10:58:33.578 [info] request done: requestId: [b804fe7b-7a32-449a-8f8f-a231b5411a21] model deployment ID: []
2026-04-03 10:58:33.580 [info] ccreq:55d776b6.copilotmd | success | gpt-4o-mini -> gpt-4o-mini-2024-07-18 | 541ms | [copilotLanguageModelWrapper]
2026-04-03 10:58:34.741 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:58:34.776 [info] ccreq:6f50041b.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 7572ms | [panel/editAgent]
2026-04-03 10:58:34.985 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:34.985 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:58:34.985 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:34.985 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:58:34.985 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:39.508 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:58:39.517 [info] ccreq:5c1a0219.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 4532ms | [panel/editAgent]
2026-04-03 10:58:39.712 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:39.713 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:58:39.713 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:39.713 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:58:39.713 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:47.785 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:58:47.799 [info] ccreq:e018287f.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 8086ms | [panel/editAgent]
2026-04-03 10:58:47.893 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:47.894 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:58:47.894 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:47.894 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:58:47.894 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:58:55.714 [info] message 0 returned. finish reason: [stop]
2026-04-03 10:58:55.719 [info] request done: requestId: [81e93cb7-7a5f-4d42-89d5-1c57479351de] model deployment ID: []
2026-04-03 10:58:55.720 [info] ccreq:298747d4.copilotmd | success | gpt-4o-mini -> gpt-4o-mini-2024-07-18 | 526ms | [copilotLanguageModelWrapper]
2026-04-03 10:59:03.767 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:59:03.817 [info] ccreq:e3f62cb2.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 15923ms | [panel/editAgent]
2026-04-03 10:59:04.289 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:59:04.289 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:59:04.289 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:59:04.289 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:59:04.289 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:59:12.167 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:59:12.172 [info] ccreq:2f52afd5.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 7882ms | [panel/editAgent]
2026-04-03 10:59:13.510 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:59:13.510 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:59:13.510 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:59:13.510 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:59:13.510 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:59:17.182 [warning] [ChatSessionWorkspaceFolderService][getWorkspaceChanges] No repository properties found for session 5342afb0-53ae-46bb-9413-56799e37233a
2026-04-03 10:59:19.114 [info] message 0 returned. finish reason: [stop]
2026-04-03 10:59:19.117 [info] request done: requestId: [545392db-9520-4600-9524-94e734d1ba9f] model deployment ID: []
2026-04-03 10:59:19.118 [info] ccreq:3bcf88c5.copilotmd | success | gpt-4o-mini -> gpt-4o-mini-2024-07-18 | 500ms | [copilotLanguageModelWrapper]
2026-04-03 10:59:26.622 [info] [messagesAPI] message 0 returned. finish reason: [stop]
2026-04-03 10:59:26.638 [info] ccreq:76a9d47f.copilotmd | success | claude-opus-4.6 -> claude-opus-4-6 | 13127ms | [panel/editAgent]
2026-04-03 10:59:26.734 [warning] Tool click_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:59:26.734 [warning] Tool drag_element failed validation: object has unsupported top-level schema keyword 'allOf'
2026-04-03 10:59:26.734 [warning] Tool hover_element failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 10:59:26.734 [warning] Tool run_in_terminal failed validation: object has unsupported top-level schema keyword 'anyOf'
2026-04-03 10:59:26.734 [warning] Tool type_in_page failed validation: object has unsupported top-level schema keyword 'oneOf'
2026-04-03 11:01:25.306 [info] [GitExtensionServiceImpl] Initializing Git extension service.
2026-04-03 11:01:25.307 [error] Error getting a session: Canceled: Canceled
2026-04-03 11:01:25.422 [info] Logged in as Cyrus-DropPrint
2026-04-03 11:01:25.428 [info] Using the Electron fetcher.
2026-04-03 11:01:25.604 [info] ConversationFeature: Waiting for copilot token to activate conversation feature
2026-04-03 11:01:26.139 [info] Got Copilot token for Cyrus-DropPrint
2026-04-03 11:01:26.139 [info] Copilot Chat: 0.43.2026040204, VS Code: 1.115.0-insider
2026-04-03 11:01:26.158 [info] [context keys] Setting context key: github.copilot-chat.activated
2026-04-03 11:01:26.161 [info] activationBlocker from 'languageModelAccess' took for 593ms
2026-04-03 11:01:26.688 [info] [CopilotCLI] OpenTelemetry enabled: exporter=file, source=github.copilot
2026-04-03 11:01:26.719 [info] Fetched model metadata in 1132ms dbe4184a-99d2-41b3-a288-4d07a71befd0
2026-04-03 11:01:26.728 [info] Latest entry: ccreq:latest.copilotmd
2026-04-03 11:01:26.728 [info] ccreq:1250133a.copilotmd | markdown
2026-04-03 11:01:26.778 [info] [CopilotCLI] MCP server started. Lock file: C:\Users\cyrus.copilot\ide\5d012bcd-9c6c-49d6-8918-e7ff507d1a3a.lock
2026-04-03 11:01:26.778 [info] [CopilotCLI] Server URI: pipe:%5C%5C.%5Cpipe%5Cmcp-d08a20b1-ef91-4610-89b4-e59a7acc8952.sock#%2Fmcp
2026-04-03 11:01:26.804 [info] [CopilotCLI] Cleaned up 1 stale lock file(s).
2026-04-03 11:01:26.871 [info] AuthenticationService: firing onDidAuthenticationChange from handleAuthChangeEvent. Has token: true
2026-04-03 11:01:26.871 [info] copilot token sku: plus_monthly_subscriber_quota
2026-04-03 11:01:26.871 [info] ConversationFeature: Activating contributions
2026-04-03 11:01:26.871 [info] GitHub.vscode-pull-request-github extension is not yet activated.
2026-04-03 11:01:26.889 [info] Registering default platform agent...
2026-04-03 11:01:26.891 [info] ConversationFeature: onDidAuthenticationChange has token: true
2026-04-03 11:01:26.891 [info] [code-referencing] Public code references are enabled.
2026-04-03 11:01:26.891 [info] activationBlocker from 'conversationFeature' took for 1337ms
2026-04-03 11:01:27.367 [info] GithubAvailableEmbeddingTypesManager: Got embeddings. Primary: metis-1024-I16-Binary. Deprecated:
2026-04-03 11:01:27.369 [info] WorkspaceChunkSearchService: using embedding type metis-1024-I16-Binary
2026-04-03 11:01:27.371 [info] BYOK: Copilot Chat known models list fetched successfully.
2026-04-03 11:01:27.440 [info] Fetched model metadata in 570ms a92bf536-2d38-432e-9fa1-367eba663fb4
2026-04-03 11:01:27.445 [info] ccreq:65b7fef1.copilotmd | markdown
2026-04-03 11:01:27.595 [warning] [ChatSessionWorkspaceFolderService][getWorkspaceChanges] No repository properties found for session 5342afb0-53ae-46bb-9413-56799e37233a
2026-04-03 11:01:27.596 [warning] [ChatSessionWorkspaceFolderService][getWorkspaceChanges] No repository properties found for session 5342afb0-53ae-46bb-9413-56799e37233a
2026-04-03 11:01:27.699 [warning] [ChatSessionWorkspaceFolderService][getWorkspaceChanges] No repository properties found for session 5342afb0-53ae-46bb-9413-56799e37233a
2026-04-03 11:01:27.995 [info] [GitExtensionServiceImpl] Successfully activated the vscode.git extension.
2026-04-03 11:01:27.995 [info] [GitExtensionServiceImpl] Enablement state of the vscode.git extension: true.
2026-04-03 11:01:27.995 [info] [GitExtensionServiceImpl] Successfully registered Git commit message provider.
2026-04-03 11:01:31.213 [warning] [ChatSessionWorkspaceFolderService][getWorkspaceChanges] No repository properties found for session 5342afb0-53ae-46bb-9413-56799e37233a
2026-04-03 11:01:35.380 [info] TypeScript server plugin activated.
2026-04-03 11:01:35.380 [info] Registered TypeScript context provider with Copilot inline completions.
2026-04-03 11:02:08.611 [warning] [ChatSessionWorkspaceFolderService][getWorkspaceChanges] No repository properties found for session 5342afb0-53ae-46bb-9413-56799e37233a

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[Gecko51]

Your logs tell the whole story. Every tool is getting rejected because of oneOf, allOf, or anyOf at the top level of their JSON Schema definitions. Copilot's tool runtime only supports a restricted subset of JSON Schema, and those combinators aren't in it. All tools fail validation, the agent has nothing to call, and it exits cleanly with finish_reason: stop. From the UI side it just looks like a normal end.

The workaround is to flatten those schemas. Instead of using oneOf or allOf at the root, use a single type with properties and required. So instead of something like:

{
  "oneOf": [{ "type": "string" }, { "type": "object", "properties": { ... } }]
}

pick the more permissive shape and define it directly. Copilot's validator is much stricter than the actual JSON Schema spec.

The no-UI-error behavior is the real bug here. Tool validation failures should surface a visible message before the model burns through 5-10 minutes of a session. Worth keeping this open as a bug report for that specifically.

What extension is registering those tools? Looks like browser automation tooling given click_element, drag_element, etc. If you can share that, it's easier to suggest the exact schema fix.

[Cyrus-DropPrint]

Understood, thanks. To clarify, I’m not defining or registering any tools or schemas myself. I’m just using Copilot in Agent/Edit/Autopilot mode to generate code.
From what I can tell, these are Copilot’s own internal automation tools (e.g. click_element, drag_element, type_in_page, run_in_terminal) that it uses to interact with the VS Code UI and write files. I don’t have control over their schema definitions, so I don't believe I am able to modify them.

It seems other people may be having similar issues.
microsoft/vscode-mssql#21770