MiniMax M3 Free leaking "]<]minimax[>[</tool_call>" #30684

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1. github-actions

   assigned

   StarpTech

   on Jun 4, 2026
2. github-actions commented on Jun 4, 2026

   

   github-actionsBot

   on Jun 4, 2026 – with GitHub Actions

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   This issue might be a duplicate of existing issues. Please check:

   • cannot handle tool call in minimax:tool_call #26296: MiniMax model leaking tool call XML tags (minimax:tool_call) in responses
   • explicit TOOL_CALL #24094: MiniMax M2.5 Free outputting explicit [TOOL_CALL] blocks in content
   • Raw <tool_calls> markup in reasoning breaks tool calls on several models #25644: Raw <tool_calls> markup leaking into output across several models
3. ulises-jeremias commented on Jun 5, 2026

   

   ulises-jeremias

   on Jun 5, 2026

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   I investigated and prepared a targeted fix.

   Root cause hypothesis

   • Some MiniMax responses can append a trailing serialized tool-call marker artifact (e.g. ]<]minimax[>[</tool_call>) to plain assistant text.
   • That artifact appears in the final rendered text because it is treated as normal text delta content.

   Fix implemented

   • Added a narrow sanitization step in SessionProcessor text finalization (text-end) to strip known trailing MiniMax tool-call leak suffixes:
     • specific marker: ]<]minimax[>[</tool_call>
     • fallback trailing </tool_call>
   • Guarded by model id: only runs when model id includes minimax.
   • The sanitizer only removes trailing leak suffixes; normal message content is preserved.

   Regression coverage

   • Added test in packages/opencode/test/session/processor-effect.test.ts:
     • session.processor strips MiniMax trailing tool_call leak suffix from assistant text
     • Verifies assistant text ends as clean Answer instead of leaked marker suffix.

   I’m opening the PR now.

   👀React with 👀1Reacted by Raymel
4. ulises-jeremias commented on Jul 14, 2026

   

   ulises-jeremias

   on Jul 14, 2026

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   Reopened the fix PR after automated cleanup closure: #36860

   @StarpTech could you please take a look when you get a chance? Thanks!
5. niStee commented on Aug 24, 2026

   

   niStee

   on Aug 24, 2026

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   Still reproducible on opencode 1.18.18, provider litellm, model minimax-m3 (Linux) — but with a variant that the strip-trailing-suffix approach would not cover.

   In child session ses_fcda349f9ffeO8zVq1Izz7B2aG (linked to its parent via session.parent_id), part prt_0338572fa001VKFnz54Sl5aRxI contains the malformed markup <]minimax[> around a bash command, plus a raw </tool_call> closing tag. In other words, the leak occurs inside tool-call serialization, not as a trailing suffix on plain assistant text at text-end.

   Implication: sanitizing trailing text suffixes (as in the closed cleanup PRs #30849 / #36860) addresses the cosmetic text leak but not this variant, where malformed tool-call markup reaches the tool-call parsing layer. The root cause likely sits in MiniMax tool-call serialization/parsing rather than text finalization.

   Notes:

   • The affected child later reached step-finish with reason stop on its own (part prt_03385771b001PfRA0NwayGKpaq), so malformed output alone is not proof of a permanent stall.
   • Evidence gathered read-only from the local session DB and scoped logs; happy to run targeted follow-up queries if useful.

   (Local paths and machine details sanitized; stable IDs retained for cross-reference.)
6. thdxr commented on Oct 11, 2026

   

   thdxr

   on Oct 11, 2026

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   Thanks for the report! OpenCode 2.0 is now out and development is focused on V2, so we're closing issues filed against OpenCode 1. Please upgrade (opencode upgrade --major, details: https://anoma.ly/notes/opencode-2-0), and if this is still relevant on 2.0, reopen this issue or open a new one with your 2.0 version.

   — from 𝕺𝖕𝖊𝖓𝕮𝖔𝖉𝖊
7. thdxr

   closed this as not plannedon Oct 11, 2026