[Error] [GitHub.copilot-chat] unhandlederror-Failed with status 400 and body: {"code":"invalid_argument","msg":"source too short (...

[vs-code-engineering]

Error Message

unhandlederror-Failed with status 400 and body: {"code":"invalid_argument","msg":"source too short (must be at least 110 tokens, but is 105)","meta":{"argument":"source"}}

Stack Trace

    at jfe.fetch (../src/platform/snippy/common/snippyFetcher.ts:71:9)
    at processTicksAndRejections (node:<REDACTED: user-file-path>:104:5) [not deminified]
    at Gfe.handlePostInsertion (../src/platform/snippy/common/snippyServiceImpl.ts:41:19)

Raw Stack Trace (minified)

Error: Failed with status 400 and body: {"code":"invalid_argument","msg":"source too short (must be at least 110 tokens, but is 105)","meta":{"argument":"source"}}     at jfe.fetch (<REDACTED: user-file-path> <REDACTED: user-file-path> VS <REDACTED: user-file-path>/resources\app\extensions\copilot\dist\extension.js:6814:2691)     at processTicksAndRejections (node:<REDACTED: user-file-path>:104:5)     at Gfe.handlePostInsertion (<REDACTED: user-file-path> <REDACTED: user-file-path> VS <REDACTED: user-file-path>/resources\app\extensions\copilot\dist\extension.js:6814:4193)

Details

Property	Value
Bucket ID	09b1e4b4-3f59-167d-f007-45b1ed365779
Extension Version	0.61.0
Last Seen	Wed Aug 19 2026 23:57:08 GMT+0000 (Coordinated Universal Time)
Platforms	win32
Product	VSCode

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This issue was automatically created from the VS Code Errors Dashboard

[vs-code-engineering]

Regression Details

• Product: VSCode (extension: GitHub.copilot-chat)
• Regression type: spike
• Spike factor: 187x increase in affected users (baseline 0.54.0: 8 users → current 0.61.0: 1,497 users)
• Bucket ID: 09b1e4b4-3f59-167d-f007-45b1ed365779
• Baseline version without meaningful signal: 0.54.0
• First version with elevated signal: 0.61.0
• Extension compare: [0.54.0...0.61.0]((marketplace.visualstudio.com/redacted)
• Dashboard: bucket page

The completions endpoint returns HTTP 400 invalid_argument — source too short (must be at least 110 tokens) — from jfe.fetch during handlePostInsertion. This appears to be a new/spiking validation error introduced in the 0.55–0.61 range of copilot-chat.

Detected by the extension regression scan comparing copilot-chat 0.54.0 → 0.61.0.

Generated by errors-regression-scan · opus48 · 95.4 AIC · ⌖ 10.3 AIC · ⊞ 9.4K · ◷