Feat: Wire up Claude adaptive thinking + effort

Co-authored-by: Opus 4.6 <noreply@anthropic.com>

providers.js

@@ -143,10 +143,6 @@ export async function streamClaude({ apiKey, body, signal, onDelta, isRunning })
   const online = (body.model ?? '').endsWith(':online')
   const model = online ? body.model.slice(0, -7) : body.model
 
-  const includeThoughts = body.reasoning?.exclude !== true
-  const effort = body.reasoning?.effort
-  const useAdaptive = effort && effort !== 'default'
-
   const system = body.messages
     .filter(m => m.role === 'system')
     .map(extractText)
@@ -165,18 +161,17 @@ export async function streamClaude({ apiKey, body, signal, onDelta, isRunning })
       }).filter(Boolean),
     })).filter(m => m.content.length),
     max_tokens: body.max_tokens || 64000,
-    stream: true,
   }
-
-  if (useAdaptive) {
-    payload.thinking = { type: 'adaptive' }
-    if (!includeThoughts) payload.thinking.display = 'omitted'
-    payload.output_config = { effort }
-  }
-
   if (system) payload.system = system
+
+  const effort = body.reasoning?.effort
+  if (effort && effort !== 'default') {
+    payload.thinking = { type: 'adaptive' }
+    payload.output_config = { effort }
+  } else {
     if (Number.isFinite(+body.temperature)) payload.temperature = +body.temperature
     if (Number.isFinite(+body.top_p)) payload.top_p = +body.top_p
+  }
 
   if (online) {
     payload.tools = [
@@ -185,53 +180,26 @@ export async function streamClaude({ apiKey, body, signal, onDelta, isRunning })
     ]
   }
 
-  const resp = await fetch('https://api.anthropic.com/v1/messages', {
-    method: 'POST',
-    headers: {
-      'x-api-key': apiKey,
-      'anthropic-version': '2023-06-01',
-      'content-type': 'application/json',
-    },
-    body: JSON.stringify(payload),
-    signal,
-  })
-  if (!resp.ok) throw new Error(`Claude API error: ${resp.status} ${await resp.text()}`)
+  const includeThoughts = body.reasoning?.exclude !== true
+  let hasThinking = false, hasContent = false
 
-  const reader = resp.body.getReader()
-  const dec = new TextDecoder()
-  let buf = '', hasThinking = false, hasContent = false
-
-  while (isRunning()) {
-    const { done, value } = await reader.read()
-    if (done) break
-    buf += dec.decode(value, { stream: true })
-    const lines = buf.split('\n')
-    buf = lines.pop()
-    for (const line of lines) {
-      if (!line.startsWith('data: ')) continue
-      const data = line.substring(6).trim()
-      if (!data) continue
+  const stream = client.messages.stream(payload)
   try {
-        const event = JSON.parse(data)
-        if (event.type === 'content_block_delta') {
+    for await (const event of stream) {
+      if (!isRunning()) break
+      if (event.type !== 'content_block_delta') continue
       const delta = event.delta
-          if (delta?.type === 'thinking_delta' && delta.thinking && includeThoughts) {
+      if (delta.type === 'thinking_delta' && includeThoughts) {
         onDelta(delta.thinking)
         hasThinking = true
-          } else if (delta?.type === 'text_delta' && delta.text) {
+      } else if (delta.type === 'text_delta') {
         if (hasThinking && !hasContent) onDelta('\n')
         onDelta(delta.text)
         hasContent = true
       }
-        } else if (event.type === 'message_delta' && event.delta?.stop_reason) {
-          break
-        } else if (event.type === 'error') {
-          throw new Error(event.error?.message || 'Claude stream error')
-        }
-      } catch (e) {
-        if (e.message?.includes('Claude')) throw e
-      }
     }
+  } finally {
+    try { stream.controller?.abort() } catch {}
   }
 }