[Stephnn0]

Link to Issue or Description of Change

1. Link to an existing issue (if applicable):

• Closes: adk run does not support arrow keys or input history #8022

Problem:
adk run reads user input with input(), which only supports arrow keys and history once readline is imported. The CLI never imported it, so pressing arrow up printed ^[[A and sent the raw escape sequence to the agent.

Solution:
Add _enable_line_editing(), which imports readline and is called at the start of run_interactively. Where readline is unavailable (Windows), it does nothing.

Testing Plan

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

Added three tests in tests/unittests/cli/utils/test_cli.py:

• test_enable_line_editing_imports_readline
• test_enable_line_editing_without_readline
• test_run_interactively_enables_line_editing

$ pytest tests/unittests/cli -n auto
1654 passed, 5 skipped, 1 xfailed

With the fix removed, test_enable_line_editing_imports_readline and test_run_interactively_enables_line_editing fail.

Manual End-to-End (E2E) Tests:

Ran the CLI input path in a pseudo-terminal: typed hello + Enter, then arrow up + Enter, and printed the two values input() returned.

before fix -> 'hello' '\x1b[A'
after fix  -> 'hello' 'hello'

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

Additional context

adk run --reload_agents reads input through sys.stdin.readline() in a background thread, so it is not covered by this change. It can be handled in a follow-up if wanted.

🤖 Generated with Claude Code

https://claude.ai/code/session_01SXKq7AVswkhFGAQZqanCsM

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