feat(frontend): Consume seeded attachments when a session starts

[ardaerzin]

Context

Top lane of the stack. Home and the overview collect attachments on the task composer (lane oss/home-overview), but nothing consumed them: a session started with files silently dropped them.

Changes

The conversation reads the first-run seed and sends the collected attachments with the opening message. This is the last step of the seeding flow; the composers below already collect into the seed state.

Tests / notes

• Two files (AgentConversation, useFirstRunSeed). @agenta/oss tsc adds nothing on this lane.

What to QA

• On Home, attach a file to the task composer and start a session: the opening message carries the attachment and the agent can read it.
• Same from an agent's overview composer.
• Regression: starting a session without attachments still opens normally.

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Ready	Preview	Aug 6, 2026 9:00pm

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Improved first-run chat setup by automatically adding files selected from the overview or Home screen as attachments.
  • Ensured seeded files are matched to the correct chat scope.
  • Prevented messages from sending before selected files finish attaching.
  • Enabled automatic sending for first-run prompts that contain no text.

Walkthrough

The first-run seed flow now matches seeds by chat scope, stages seeded files through conversation attachments, and waits for attachment processing before auto-send. Empty-string prompts can also trigger auto-send.

Changes

First-run seed handling

Layer / File(s)	Summary
Scope-aware seed staging web/oss/src/components/AgentChatSlice/hooks/useFirstRunSeed.ts, web/oss/src/components/AgentChatSlice/AgentConversation.tsx	useFirstRunSeed accepts the chat scope, stages seeded files, and clears the seed after processing. AgentConversation connects the file callback to attachments.addFiles.
Settled seed auto-send web/oss/src/components/AgentChatSlice/hooks/useFirstRunSeed.ts	Auto-send accepts empty-string prompts and waits for seeded attachments to settle before submission.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• Agenta-AI/agenta#5569: Introduces the useFirstRunSeed hook and its AgentConversation integration.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly describes the main change: enabling the conversation to consume attachments from the seed when a session starts.
Description check	✅ Passed	The description explains the context, changes, and testing scope, all related to the changeset of consuming seeded attachments on session start.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch oss/seed-attachments

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[ardaerzin]

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📒 Files selected for processing (2)

• web/oss/src/components/AgentChatSlice/AgentConversation.tsx
• web/oss/src/components/AgentChatSlice/hooks/useFirstRunSeed.ts

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[mmabrouk]

Landed in release/v0.112.0 as part of the 0.112.0 release. The release branch now contains this work at commit ae71a92. Closing here since there is nothing left to merge.