[Danny Ward (dannyward630)]

Motivation & Context

LocalShellTool attaches a _ShellResultText subclass to text content. FileSessionStore rejects that subclass during session serialization, so a tool-using checkpoint fails after the command has already run.

Description & Review Guide

• What are the major changes? _parse_shell_result now stores str(result) in text content and keeps structured shell fields in additional_properties. The regression test saves and reloads the parsed function result through FileSessionStore.
• What is the impact of these changes? Shell output stays the same, and session snapshots retain output and metadata after shell execution.
• What do you want reviewers to focus on? Confirm normalization applies only to the model-facing text and that stdout, stderr, exit code, truncation, and timeout metadata survive the round trip.

Related Issue

Fixes #9696

AI Assistance

• No material AI assistance was used.
• This is an AI-assisted contribution.
• I reviewed, understood, and verified all submitted content and accept responsibility for it.

AI assistance details:

Codex (GPT-6, high reasoning effort) assisted with investigation, implementation, the regression test, and this PR description. The change was verified by running the tools package unit suite (160 passed, 9 skipped, 3 expected failures) and Ruff checks.

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR links to an agreed issue with no competing open PR.
• This is not a breaking change.

[Copilot]

🟢 Approval recommended

The narrow conversion addresses the reported serialization failure, and the regression test covers output and metadata preservation with no unresolved findings.

No open issues 🎉

What changed in this PR

Fixes #9696 by normalizing parsed shell output to a plain string so FileSessionStore can persist it without losing structured metadata.

Changes:

• Converts only model-facing text to str, leaving shell metadata unchanged.
• Adds a session-store round-trip regression test covering output, exit code, truncation, and timeout metadata.

File	Description
python/​packages/​tools/​tests/​test_shell_result.py	Verifies parsed shell output and metadata survive session persistence.
python/​packages/​tools/​agent_framework_tools/​shell/​_types.py	Normalizes parsed text to a serializable plain string.

_{Review effort: Balanced}

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