refactor!: Remove agent breakpoint and agent snapshot

[sjrl]

Related Issues

• WIP and just experimenting

Proposed Changes:

Remove break point and snapshot support from the internals of Agent. Motivation is that it's not heavily used and adds a lot of complexity to the Agent internals.

Open to adding this back in the future if we see a strong need (e.g. HITL + Breakpoints to enable long running Agents). And if we decide to do so I think there is a simpler way to re-add it than in it's current form.

How did you test it?

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct.
• I have updated the related issue with new insights and changes.
• I have added unit tests and updated the docstrings.
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I have documented my code.
• I have added a release note file, following the contributors guidelines.
• I have run pre-commit hooks and fixed any issue.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
haystack-docs	Ignored	Preview	Apr 28, 2026 10:18am

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
haystack/components/agents
agent.py					842, 848-864
haystack/components/tools
tool_invoker.py
haystack/core
errors.py					127, 142-144, 151-153
haystack/core/pipeline
async_pipeline.py
base.py
breakpoint.py					53, 94-97, 188
pipeline.py					340, 356-357
haystack/dataclasses
__init__.py
breakpoints.py
haystack/human_in_the_loop
strategies.py					471
Project Total

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