Haystack v3.2.0: experimental context compaction and token budgets for Agent runs

Haystack v3.2.0 was published on 2026-09-24. The release notes describe two experimental agent hooks: SummarizationCompactor, a compaction strategy for CompactionHook that replaces older turns and agent steps with LLM-written summaries while keeping the newest steps unchanged, and TokenBudgetHook, which stops an Agent run before the next LLM call once a token budget is spent and reports exit_reason as token_budget_exceeded. Both build on a stop_run state key that any hook can set. Source: v3.2.0 release notes.

Relation to the directory: see Haystack and Haystack vs LlamaIndex agents.