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fix: message delta visibility for anthropic fixed #2212

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fix: message delta visibility for anthropic fixed #2212

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9ff2bb1
fix: added condition for message delta to be included for anthropic
Kannav02 Oct 2, 2025
1f16e08
fix: raw field included in AgentStep and AgentResultData types, so us…
Kannav02 Oct 2, 2025
ddbbfaa
fix: last chunk fixed from always being undefined to having the lastC…
Kannav02 Oct 2, 2025
92d840a
Create wild-bananas-sip.md
marcusschiesser Oct 2, 2025
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6 changes: 6 additions & 0 deletions .changeset/wild-bananas-sip.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
---
"@llamaindex/workflow": patch
"@llamaindex/anthropic": patch
---

fix: message delta visibility for anthropic
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We need a change set what we are fixing for workflow in this PR

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@Kannav02 Kannav02 Oct 2, 2025 •
edited
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Oh I see, I was going through CONTRIBUTING.md and since this wasn't a feature, I thought that this wouldn't need a changeset, I'm sorry about it

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yes. sure, that would be great!

9 changes: 9 additions & 0 deletions packages/providers/anthropic/src/llm.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -604,6 +604,15 @@ export class Anthropic extends ToolCallLLM<
? part.delta.signature
: undefined;

if (part.type === "message_delta") {
yield {
raw: part,
delta: "",
options: {},
};
continue;
}

if (
part.type === "content_block_start" &&
part.content_block.type === "tool_use"
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9 changes: 7 additions & 2 deletions packages/workflow/src/agent/agent-workflow.ts
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Expand Up @@ -64,6 +64,7 @@ export type AgentResultData<O = JSONObject> = {
message: ChatMessage;
state?: AgentWorkflowState | undefined;
object?: O | undefined;
raw?: unknown;
};
export const stopAgentEvent = workflowEvent<AgentResultData, "llamaindex-stop">(
{
Expand All @@ -88,6 +89,7 @@ export type AgentStep = {
agentName: string;
response: ChatMessage;
toolCalls: AgentToolCall[];
raw: unknown;
};
export const agentStepEvent = workflowEvent<AgentStep>();

Expand Down Expand Up @@ -426,6 +428,7 @@ export class AgentWorkflow implements Workflow {
agentName: agent.name,
response: output.response,
toolCalls: output.toolCalls,
raw: output.raw,
}),
);

Expand All @@ -436,7 +439,7 @@ export class AgentWorkflow implements Workflow {
context: StatefulContext<AgentWorkflowState>,
event: WorkflowEventData<AgentStep>,
) => {
const { agentName, response, toolCalls } = event.data;
const { agentName, response, toolCalls, raw } = event.data;
const agent = this.agents.get(agentName);
if (!agent) {
throw new Error(
Expand All @@ -453,7 +456,7 @@ export class AgentWorkflow implements Workflow {
const agentOutput = {
response,
toolCalls: [],
raw: response,
raw,
currentAgentName: agentName,
};
const content = await agent.finalize(context.state, agentOutput);
Expand All @@ -472,6 +475,7 @@ export class AgentWorkflow implements Workflow {
result: content.response.content,
state: context.state,
object,
raw: content.raw ?? raw,
});
}

Expand Down Expand Up @@ -594,6 +598,7 @@ export class AgentWorkflow implements Workflow {
message: responseMessage,
result: output,
state: context.state,
raw,
});
}

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1 change: 1 addition & 0 deletions packages/workflow/src/agent/function-agent.ts
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Expand Up @@ -197,6 +197,7 @@ export class FunctionAgent implements BaseWorkflowAgent {
let lastChunk: ChatResponseChunk | undefined;
const toolCalls: Map<string, AgentToolCall> = new Map();
for await (const chunk of responseStream) {
lastChunk = chunk;
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Why is this needed?

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because in the following code snippet

    return {
      response: message,
      toolCalls: Array.from(toolCalls.values()),
      raw: lastChunk?.raw,
      currentAgentName: this.name,
    };

the raw chunk that is being returned takes the value from lastChunk.raw, in the earlier code, lastChunk was beind defined, but never assigned a value, thus lastChunk always had the value as undefined, so thats why i assigned it tha lastChunk that we see in the loop, sometime it could even be empty text, but even if its empty, it still sends metadata

response += chunk.delta;
ctx.sendEvent(
agentStreamEvent.with({
Expand Down