fix: improve X-Initiator detection for tool calls to prevent premium overcharge

The current isAgent detection only checks the last message role, which fails
when tool results are returned. Tool call responses often have role: 'user'
or contain tool_result parts, causing GitHub to incorrectly charge premium
requests for agent-initiated actions.

This fix checks the entire message context for tool calls (tool_result parts
or role: 'tool') and marks the request as agent-initiated when tools are
present, preventing incorrect premium request charges.

Fixes #8030

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Author: yepashkov

packages/opencode/src/plugin/github-copilot/copilot.ts

@@ -83,30 +83,45 @@ export async function CopilotAuthPlugin(input: PluginInput): Promise<Hooks> {
                 // Completions API
                 if (body?.messages && url.includes("completions")) {
                   const last = body.messages[body.messages.length - 1]
+                  const hasToolCalls = body.messages.some(
+                    (msg: any) =>
+                      Array.isArray(msg.content) && msg.content.some((part: any) => part?.type === "tool_result") ||
+                      msg.role === "tool",
+                  )
                   return {
                     isVision: body.messages.some(
                       (msg: any) =>
                         Array.isArray(msg.content) && msg.content.some((part: any) => part.type === "image_url"),
                     ),
-                    isAgent: last?.role !== "user",
+                    isAgent: hasToolCalls || last?.role !== "user",
                   }
                 }
 
                 // Responses API
                 if (body?.input) {
                   const last = body.input[body.input.length - 1]
+                  const hasToolCalls = body.input.some(
+                    (item: any) =>
+                      Array.isArray(item?.content) && item.content.some((part: any) => part?.type === "tool_result") ||
+                      item.role === "tool",
+                  )
                   return {
                     isVision: body.input.some(
                       (item: any) =>
                         Array.isArray(item?.content) && item.content.some((part: any) => part.type === "input_image"),
                     ),
-                    isAgent: last?.role !== "user",
+                    isAgent: hasToolCalls || last?.role !== "user",
                   }
                 }
 
                 // Messages API
                 if (body?.messages) {
                   const last = body.messages[body.messages.length - 1]
+                  const hasToolCalls = body.messages.some(
+                    (msg: any) =>
+                      Array.isArray(msg.content) && msg.content.some((part: any) => part?.type === "tool_result") ||
+                      msg.role === "tool",
+                  )
                   const hasNonToolCalls =
                     Array.isArray(last?.content) && last.content.some((part: any) => part?.type !== "tool_result")
                   return {
@@ -122,7 +137,7 @@ export async function CopilotAuthPlugin(input: PluginInput): Promise<Hooks> {
                               part.content.some((nested: any) => nested?.type === "image")),
                         ),
                     ),
-                    isAgent: !(last?.role === "user" && hasNonToolCalls),
+                    isAgent: hasToolCalls || !(last?.role === "user" && hasNonToolCalls),
                   }
                 }
               } catch {}