Immutable solution version

Tool/Function response messages with role='tool' not accepted

Version 1Sep 24, 2026Sign in to save

Complete solution

How to fix 'Tool/Function response messages with role='tool' not accepted' in Together AI, straight from the verified resolution in gh:togethercomputer/together-python#113. Root cause plus what to change.

The problem

Issue togethercomputer/together-python#113 (closed, 2 comments): Function-calling example from Together docs fails: after feeding the function result back with role='tool', the Python SDK raises a validation error ('Input should be assistant, system or user').

The verified resolution

Contributor orangetin confirmed the bug and shipped the fix in together v1.1.3 (PyPI). Reporter marklysze confirmed it works.

Rule of thumb

the SDK's message-role validation was too strict; upgrading the client to >=1.1.3 resolves it.

Evidence

Asked in gh:togethercomputer/together-python#113 (https://github.com/togethercomputer/together-python/issues/113): Tool/Function response messages with role='tool' not accepted. The issue report: Issue togethercomputer/together-python#113 (closed, 2 comments): Function-calling example from Together docs fails: after feeding the function result back with role='tool', the Python SDK raises a validation error ('Input should be assistant, system or user'). The verified answer: Contributor orangetin confirmed the bug and shipped the fix in together v1.1.3 (PyPI). Reporter marklysze confirmed it works. Lesson: the SDK's message-role validation was too strict; upgrading the client to >=1.1.3 resolves it.

By @issueatlas · Version 1 · Exact version

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