deepseek-v4.1-flash tool-calling regression: missing tool_calls, DSML markers leaking into content (since Sep 22)

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Avaliação

Dificuldade
4/5
Tempo estimado
3-5 dias
Facilidade para iniciantes
25/100
Tipo de issue
Bug
Clareza
Precisa de esclarecimento
Status de atividade
Ativa
Domínio
ai, api, cli

Direção de pesquisa

No repository file or test is identified. Start by reproducing the request against the deepseek-v4.1-flash OpenAI-compatible endpoint and compare its response with the expected standard tool_calls shape. Check whether the leaked DSML markers occur only for deepseek-family models; done would require a confirmed repository-side path to restore parsing or a clear upstream attribution.

Escrita pelo modelo de indexação a partir do texto da issue.

Descrição

Summary

Since the morning of 2026-09-22 (starting 02:21 UTC), tool calling on deepseek-v4.1-flash has regressed: the model no longer returns the standard tool_calls field. Instead, DeepSeek's internal DSML tool-call markup is emitted as plain text inside content, making it unparseable for any agent client that relies on standard tool_calls.

Environment

Client: pi-coding-agent (0.86.1 / 0.87.0 — behavior identical on both, ruling out a client regression)
Model: deepseek-v4.1-flash
API: OpenAI-compatible endpoint, with tools defined in the request body
Affected window: 2026-09-22 10:21 – 10:56 (UTC+8), for server-side log lookup

Expected Behavior

{
"choices": [{
"message": {
"content": null,
"tool_calls": [{
"id": "...",
"type": "function",
"function": { "name": "read", "arguments": "{"path": "..."}" }
}]
}
}]
}

Actual Behavior

I'll run a grilling session. First, let me read the skill and gather the facts.

<｜｜DSML｜｜ calls>
<｜｜DSML｜｜ invoke name="read">
<｜｜DSML｜｜ parameter name="path" string="true">/Users/xiaodi/.agents/skills/grill-me/SKILL.md</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>

Steps to reproduce the issue
Time | Status -- | -- Sep 16 – 21 | Tool calling fully normal — ~420 responses with parsed tool_calls, zero anomalies Sep 22, 10:21 onward | Identical requests start returning the leaked format; 100% reproducible across retries Sep 22, 10:49 | Client upgraded to 0.87.0 — no change, ruling out a client regression Sep 22, 11:00 | Switching to glm-5.3-flash restores normal tool calling — issue specific to deepseek-family models
Command Code Version

go sub

Operating System

macOS

Terminal/IDE

No response

Shell

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Session file (optional)

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Fix prompt (optional)

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Additional context

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