Azure streaming merges parallel tool calls into one corrupted call with mixed id/name and concatenated invalid JSON arguments

crewAI's Azure provider keyed streamed tool-call deltas by their position inside each chunk rather than by the tool call's wire index. With parallel tool calls every chunk had position 0, so the executor received a single call with the first call's id, the last call's name and concatenated argument fragments.

Framework / agent

crewAI · crewAI agent with native parallel tool calling

Remediation attempts

TESTED

Recurrence

not documented

Source languages

en

Updated

2026-09-30

Sources

• GITHUB ISSUE [BUG] Azure streaming completions merge parallel tool calls into one corrupted call — github.com/crewAIInc/crewAI, retrieved 2026-09-29
• GITHUB PULL REQUEST fix(azure): key streamed tool calls by wire index — github.com/crewAIInc/crewAI, retrieved 2026-09-29

Symptoms

• The executor receives one tool call instead of several when the model makes parallel calls in a streaming turn
• The merged call has a mismatched id and name and concatenated arguments that are invalid JSON

Similarity to your system is not implied. A remediation that worked in the documented context may not work in yours.