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wire 2026-10-09
stories 19

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Python agent SDK types catch up to TypeScript hooks and init payloads

By RepoJournal · Filed · About Anthropic · Composed from the cited sources · methodology

The Python agent SDK gains typed hook outputs and a typed init system message payload, closing the gap with the TypeScript SDK, while the rest of the day is receipts and changelog housekeeping.

feat(types): add hook-specific output types and missing hook input fields anthropics/claude-agent-sdk-python

by qing-ant

qing-ant added hook-specific output types and the hook input fields the public docs reference, matching the TypeScript SDK (0.3.284). Everything added is an optional key or a new union member, so existing callbacks keep type-checking without edits.

feat(types): add SystemInitData for the init system message payload anthropics/claude-agent-sdk-python

by qing-ant

The init system message, the richest frame the CLI sends, was only reachable through the untyped SystemMessage.data dict in Python. A new SystemInitData TypedDict types that payload with the same key names as on the wire, adding uuid, session_id, agents, apiKeySource, betas, claude_code_version, cwd, and tools.

receipts: query every local clone when counting commits anthropics/claude-plugins-official

by claude

When a project was checked out in more than one local clone with the same directory name, the receipt asked git about only one of them and undercounted commits. The fix queries every local clone, and a companion change reports git unavailable when a clone errored and none found commits.

chore: Update mods/ anthropics/claude-code

by GitHub Actions (publish-mods)

Generated chores kept the claude-code tree current: a CHANGELOG.md and feed.xml refresh and a publish-mods update to mods/. Nothing for readers to act on.

Quick answers

What shipped in Anthropic on October 9, 2026?
The Python agent SDK gains typed hook outputs and a typed init system message payload, closing the gap with the TypeScript SDK, while the rest of the day is receipts and changelog housekeeping. In total, 12 commits, 5 pull requests, and 2 releases landed.
Who contributed to Anthropic on October 9, 2026?
4 developers shipped this update, including qing-ant, claude, Morgan Lunt, and GitHub Actions.
What were the notable Anthropic updates?
feat(types): add hook-specific output types and missing hook input fields, feat(types): add SystemInitData for the init system message payload, and receipts: query every local clone when counting commits.