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Project	Deployment	Actions	Updated (UTC)
docs	Skipped		May 15, 2026 5:10pm

Greptile Summary

This PR adds file attachment support to the agent block (upload or wire files into any agent's latest user message) and introduces a new file_v4 block with dedicated Read, Fetch, Write, and Append operations, replacing the legacy v3 block in the toolbar.

• A new attachments.ts module centralises per-provider content building (OpenAI Responses API, Anthropic document blocks, Gemini inlineData, Bedrock native blocks, OpenRouter, and image-only adapters); all provider files now call into it to strip the files field before sending the payload.
• attachFilesToLastUserMessage in the agent handler hydrates user-provided files and appends them to the last user message; the early guard that should reject unsupported providers (xai, deepseek, cerebras) does not fire because getAttachmentProvider returns a non-null value for them, causing unnecessary file hydration and a test that will fail in CI.
• file_v4 introduces a file_read tool backed by the existing /api/tools/file/manage route (new read operation) and a file_fetch tool that reuses the parse endpoint with optional custom headers for authenticated downloads.

Confidence Score: 3/5

The file attachment pipeline works correctly end-to-end for all supported providers, but the early guard in the agent handler silently passes for three declared-unsupported providers, causing wasted file hydration and a broken test.

The early rejection check in attachFilesToLastUserMessage passes for xai, deepseek, and cerebras because getAttachmentProvider returns a non-null string for them. In production the error is eventually thrown inside the provider's formatter, but only after files are fetched and decoded. In the test suite executeProviderRequest is mocked, so the formatter never runs and the new test "should reject files for providers without attachment support" will fail in CI.

apps/sim/executor/handlers/agent/agent-handler.ts and apps/sim/executor/handlers/agent/agent-handler.test.ts need the most attention.

Important Files Changed

Sequence Diagram

sequenceDiagram
    participant UI as Agent Block UI
    participant AH as AgentBlockHandler
    participant AT as attachments.ts
    participant HY as hydrateUserFilesWithBase64
    participant PR as Provider (openai/anthropic/…)

    UI->>AH: execute(inputs.files)
    AH->>AH: normalizeFileInput(filesInput)
    AH->>AH: getAttachmentProvider(providerId) — guard
    Note over AH: xai/deepseek/cerebras pass guard (non-null) ⚠️
    AH->>HY: hydrateUserFilesWithBase64(userFiles)
    HY-->>AH: UserFile[] with base64
    AH->>AH: attach files to last user message
    AH->>PR: executeProviderRequest(messages with files)
    PR->>AT: buildXxxMessageContent / formatMessagesForProvider
    AT->>AT: prepareProviderAttachments
    Note over AT: Throws for xai/deepseek/cerebras here
    AT-->>PR: formatted content parts
    PR-->>AH: ProviderResponse

_{Reviews (1): Last reviewed commit: "Clean up attachments" | Re-trigger Greptile}