anthropics / anthropics/claude-agent-sdk-python

Agent response undefined is not an object (evaluating '$.speed')

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Description

# Summary
We are utilizing the claude-agent-sdk (v0.1.56) for our coding agent. some users have reported a recurring error in the execution logs:
`Agent response: undefined is not an object (evaluating '$.speed')`

Environment:
```
claude-agent-sdk==0.1.56
anthropic>=0.40.0
```

Related:
https://github.com/anthropics/claude-code/issues/40737
https://github.com/anthropics/claude-code/issues/40189

Contributor guide

No contributing guide indexed for this repository

Research direction

Start by reproducing the execution-log error with claude-agent-sdk v0.1.56 and the listed anthropic dependency range, then compare the behavior with related issues 40737 and 40189. Done means identifying the response shape that triggers the error and documenting or testing a confirmed fix.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
ai
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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