fix(AI Agent Node): Unify memory management for streaming/non-streaming

[schrothbn]

Summary

Unifies memory management between streaming and non-streaming modes in the AI Agent node. Previously, memory was saved in multiple places, leading to and inconsistent behavior. This PR consolidates memory saving to a single location in runAgent.ts after agent completion.

• Removed memory saving logic from processEventStream.ts (was being called during on_tool_end events AND at stream completion)
• Added buildToolContext() helper function for consistent tool call formatting across both modes
• Extended saveToMemory() to accept optional steps parameter for including tool context
• Removed redundant saveToolResultsToMemory() function

Related Linear tickets, Github issues, and Community forum posts

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nts/Agent/agents/ToolsAgent/V3/helpers/runAgent.ts	16.66%	5 Missing ⚠️
...angchain/utils/agent-execution/memoryManagement.ts	66.66%	2 Missing and 1 partial ⚠️

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[currents-bot]

✅

E2E Tests: n8n tests passed after 8m 36.4s

🟢 588 · 🔴 0 · ⚪️ 12 · 🟣 2

View Run Details

Run Details

• Project: n8n

• Groups: 2

• Framework: Playwright

• Run Status: Passed

• Commit: 0d1c3a8

• Spec files: 96

• Overall tests: 600

• Duration: 8m 36.4s

• Parallelization: 9

Groups

GroupId	Results	Spec Files Progress
ui	🟢 539 · 🔴 0 · ⚪️ 12 · 🟣 2	90 / 90
ui:isolated	🟢 49 · 🔴 0 · ⚪️ 0	6 / 6

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[cubic-dev-ai]

No issues found across 5 files