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* feat(hooks): expose input messages to BeforeInvocationEvent Add messages attribute to BeforeInvocationEvent to enable input-side guardrails for PII detection, content moderation, and prompt attack prevention. Hooks can now inspect and modify messages before they are added to the agent's conversation history. - Add writable messages attribute to BeforeInvocationEvent (None default) - Pass messages parameter from _run_loop() to BeforeInvocationEvent - Add unit tests for new messages attribute and writability - Add integration tests for message modification use case - Update docs/HOOKS.md with input guardrails documentation Resolves #8 * refactor: address review feedback - Remove detailed Input Guardrails section from docs/HOOKS.md - Simplify BeforeInvocationEvent docstring per review - Remove backward compatibility note from messages attribute - Remove no-op test for messages initialization * refactor: simplify test assertions per review Use concise equality comparison for BeforeInvocationEvent assertions instead of verbose instance checks and property assertions. * Use overwritten messages array for the agent * Fix mypy issue --------- Co-authored-by: Strands Agent <217235299+strands-agent@users.noreply.github.com>
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…1474) * feat(hooks): expose input messages to BeforeInvocationEvent Add messages attribute to BeforeInvocationEvent to enable input-side guardrails for PII detection, content moderation, and prompt attack prevention. Hooks can now inspect and modify messages before they are added to the agent's conversation history. - Add writable messages attribute to BeforeInvocationEvent (None default) - Pass messages parameter from _run_loop() to BeforeInvocationEvent - Add unit tests for new messages attribute and writability - Add integration tests for message modification use case - Update docs/HOOKS.md with input guardrails documentation Resolves strands-agents#8 * refactor: address review feedback - Remove detailed Input Guardrails section from docs/HOOKS.md - Simplify BeforeInvocationEvent docstring per review - Remove backward compatibility note from messages attribute - Remove no-op test for messages initialization * refactor: simplify test assertions per review Use concise equality comparison for BeforeInvocationEvent assertions instead of verbose instance checks and property assertions. * Use overwritten messages array for the agent * Fix mypy issue --------- Co-authored-by: Strands Agent <217235299+strands-agent@users.noreply.github.com>
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lizradway
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Sep 10, 2026
- Guard eager hook against pinned messages (fix #1) - Add {@link ContextManagerConfig} to ContextManagerStrategy TSDoc (fix strands-agents#2) - Remove overflow clear so emergency truncate always fires as safety net (fix strands-agents#3) - Warn when both contextManager and conversationManager are set (fix strands-agents#4) - Fix "turns" → "messages" in staleToolCleanup doc (fix strands-agents#5) - Improve two-pass pinned test to exercise repairAlternation merge (fix strands-agents#8)
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Description
Add Anthropic Claude API support to the SDK, enabling integration with Claude models for agent functionality. This implementation includes proper message formatting, tool use
handling, and media support.
Documentation PR
PR in the agent-docs repo will be submitted separately.
Type of Change
Testing
[How have you tested the change?]
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