[BUG]: codestral, pixtral, mixtral skip Mistral tool call transform (has fix) #16636

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1. tobwen

   added

   bugSomething isn't workingSomething isn't working

   on Mar 8, 2026
2. github-actions

   assigned

   thdxr

   on Mar 8, 2026
3. github-actions

   added

   coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

   on Mar 8, 2026
4. tobwen

   changed the title [-][BUG]: codestral, pixtral, mixtral skip Mistral tool call transform (follow-up)[/-] [+][BUG]: codestral, pixtral, mixtral skip Mistral tool call transform (has fix)[/+] on Mar 8, 2026
5. thdxr

   assigned

   jlongster

   and unassigned

   thdxr

   on Apr 26, 2026
6. thdxr

   removed

   bugSomething isn't workingSomething isn't working

   coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

   on May 3, 2026
7. fmflurry commented on May 7, 2026

   

   fmflurry

   on May 7, 2026

   More actions

   Using Mistral Medium 3.5, does the tool calls work for you ? Mine is corrupted and it can't properly call basic tools.

   • OpenCode: 1.14.40
   • Model: mistral/mistral-medium-2604
   • Provider: native mistral via @ai-sdk/mistral
   • Runtime where bug appears: OpenCode worker / harness session
   • Plugins enabled: @tarquinen/opencode-dcp@latest
   • Platform: macOS arm64

   Observed examples:

   write{"filePath":"...","content":"..."}
   task{"description":"...","prompt":"..."}
   read{"filePath":"..."}
   Those are rendered as normal assistant text/final content, so no tool executes. Session becomes unusable because the agent keeps “calling” tools in plain text.

   
8. sttomm commented on May 13, 2026

   

   sttomm

   on May 13, 2026

   More actions

   I also ran into the same issue as @fmflurry. It happens very frequently to me. It simply responds the toolcall in a normal user message and then gets stuck, as the toolcall does not come back.
9. fmflurry commented on May 13, 2026

   

   fmflurry

   on May 13, 2026

   More actions

   I also ran into the same issue as @fmflurry. It happens very frequently to me. It simply responds the toolcall in a normal user message and then gets stuck, as the toolcall does not come back.

   I found a solution. I updated the @ai-sdk/mistral and created a provider to override the default one.
10. Crazyphil commented on Jul 6, 2026

    

    Crazyphil

    on Jul 6, 2026

    More actions

    @fmflurry How did you define the provider? I tried the same workaround, but I still get the same bug.

    This is my definition in openhab.jsonc:

    {
      // ...
      "provider": {
        "mistral": {
          "name": "Mistral (custom)",
          "npm": "@ai-sdk/mistral@4.0.5",
          "models": {
            "mistral-medium-3-5": {
              "name": "Mistral Medium 3.5",
              "variants": {
                "high": {
                  "reasoningEffort": "high"
                }
              }
            },
            "mistral-small-2603": {
              "name": "Mistral Small 4",
              "variants": {
                "high": {
                  "reasoningEffort": "high"
                }
              }
            }
          }
        }
      },
      // ...
    }
11. fmflurry commented on Jul 6, 2026

    

    fmflurry

    on Jul 6, 2026

    More actions

    @fmflurry How did you define the provider? I tried the same workaround, but I still get the same bug.

    This is my definition in openhab.jsonc:

    {
      // ...
      "provider": {
        "mistral": {
          "name": "Mistral (custom)",
          "npm": "@ai-sdk/mistral@4.0.5",
          "models": {
            "mistral-medium-3-5": {
              "name": "Mistral Medium 3.5",
              "variants": {
                "high": {
                  "reasoningEffort": "high"
                }
              }
            },
            "mistral-small-2603": {
              "name": "Mistral Small 4",
              "variants": {
                "high": {
                  "reasoningEffort": "high"
                }
              }
            }
          }
        }
      },
      // ...
    }

    Take a look at the bottom of my config file : https://github.com/fmflurry/settings-opencode/blob/master/opencode.jsonc
12. rekram1-node

    closed this as completedin #37982on Jul 20, 2026