修改claude system参数为数组，增加通用性

[yunayj]

将 openai 格式转换成claude时，如果system参数是一个字符串时，转换成claude格式后，system参数也是一个字符串，现在官方给的参考是字符串或数组皆可，但为了通用性，改为数组

最近，发现一个Claude中转站支持Cherry Studio的Anthropic 类型，但是通过new api (v0.9.0-alpha.16)(Anthropic)接入Cherry Studio(OpenAi类型)，就系统提示词会失效，经过对比请求参数，发现是New api将OpenAi格式转为Anthropic格式后，system参数默认是一个字符串。

查询Anthropic文档，发现字符串和数组形式皆可，而Cherry Studio的system参数是数组，为了通用性，将system参数改为数组，哪怕只有一个字符串。

下面是一些请求：

这个是Cherry Studio发送的请求

POST /v1/chat/completions HTTP/1.1
Host: localhost:3000
Connection: keep-alive
Content-Length: 256
x-stainless-timeout: 600
sec-ch-ua-platform: "Windows"
authorization: Bearer sk-xxx
sec-ch-ua: "Not)A;Brand";v="8", "Chromium";v="138"
x-stainless-retry-count: 0
x-api-key: sk-xxx
sec-ch-ua-mobile: ?0
x-title: Cherry Studio
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) CherryStudio/1.5.7 Chrome/138.0.7204.100 Electron/37.2.3 Safari/537.36
accept: application/json
http-referer: https://cherry-ai.com
content-type: application/json
Sec-Fetch-Site: cross-site
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Accept-Encoding: gzip, deflate, br, zstd
Accept-Language: zh-CN

{"model":"claude-3-7-sonnet-20250219","messages":[{"role":"system","content":"你是一个小精灵鬼，无论什么都想调皮一下"},{"role":"user","content":"你好"}],"temperature":0.7,"top_p":1,"stream":true,"stream_options":{"include_usage":true}}

这个是New api将上面这个请求转换发后发送的请求

POST /claude/v1/messages HTTP/2
host: xxx.com
user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) CherryStudio/1.5.7 Chrome/138.0.7204.100 Electron/37.2.3 Safari/537.36
content-type: application/json
accept: application/json
x-api-key: sk-xxx
anthropic-version: 2023-06-01
content-length: 226
accept-encoding: gzip

{"model":"claude-3-7-sonnet-20250219","system":"你是一个小精灵鬼，无论什么都想调皮一下","messages":[{"role":"user","content":"你好"}],"max_tokens":8192,"temperature":0.7,"top_p":1,"stream":true,"tools":[]}

这个是Cherry Studio通过Anthropic类型接入中转站发送的请求

POST /claude/v1/messages HTTP/2
host: xxx.com
content-length: 445
sec-ch-ua-platform: "Windows"
x-stainless-os: Unknown
anthropic-dangerous-direct-browser-access: true
anthropic-beta: output-128k-2025-02-19
x-stainless-runtime: browser:chrome
x-stainless-arch: unknown
sec-ch-ua: "Not)A;Brand";v="8", "Chromium";v="138"
x-api-key: sk-xxx
sec-ch-ua-mobile: ?0
anthropic-version: 2023-06-01
x-stainless-lang: js
accept: application/json
content-type: application/json
x-stainless-helper-method: stream
x-stainless-timeout: 600
x-stainless-package-version: 0.41.0
x-stainless-runtime-version: 138.0.7204
x-stainless-retry-count: 0
user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) CherryStudio/1.5.7 Chrome/138.0.7204.100 Electron/37.2.3 Safari/537.36
sec-fetch-site: cross-site
sec-fetch-mode: cors
sec-fetch-dest: empty
accept-encoding: gzip, deflate, br, zstd
accept-language: zh-CN
priority: u=1, i

{
  "model": "claude-3-7-sonnet-20250219",
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "你好"
        }
      ]
    }
  ],
  "max_tokens": 4096,
  "temperature": 0.7,
  "top_p": 1,
  "system": [
    {
      "type": "text",
      "text": "你是一个小精灵鬼，无论什么都想调皮一下"
    }
  ],
  "thinking": {
    "type": "disabled"
  },
  "stream": true
}

下面这个是我这个commit修改后的请求

POST /claude/v1/messages HTTP/2
host: code.newcli.com
user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) CherryStudio/1.5.7 Chrome/138.0.7204.100 Electron/37.2.3 Safari/537.36
content-type: application/json
accept: application/json
x-api-key: sk-xxx
anthropic-version: 2023-06-01
content-length: 226
accept-encoding: gzip

{"model":"claude-3-7-sonnet-20250219","system":[{"text":"你是一个小精灵鬼，无论什么都想调皮一下","type":"text"}],"messages":[{"role":"user","content":[{"text":"你好","type":"text"}]}],"max_tokens":4096,"temperature":0.7,"top_p":1,"stream":true,"thinking":{"type":"disabled"}}

Summary by CodeRabbit

• New Features

  • Support for multiple system messages when using Claude, allowing several system prompts to be included in a single request.
  • Handles composite system content by aggregating multiple text pieces into a unified system context.
  • Lays groundwork for richer media in system prompts in future updates.

• Improvements

  • More consistent and reliable processing of system prompts, improving overall response context and quality.

[coderabbitai]

Walkthrough

Shifts Claude system handling from a single string to an array of media messages. Aggregates multiple system messages (including composite text pieces) into []dto.ClaudeMediaMessage and assigns to claudeRequest.System after processing all messages. Other request flow remains unchanged.

Changes

Cohort / File(s)	Summary
Claude relay system aggregation relay/channel/claude/relay-claude.go	Collects all system messages into a local []dto.ClaudeMediaMessage, converting string and composite text content into Type "text" entries; assigns aggregated slice to claudeRequest.System. Notes placeholders for future non-text media types.
API surface update (ClaudeRequest.System) dto/...	Changes ClaudeRequest.System type from string to []dto.ClaudeMediaMessage, enabling multiple system entries.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  participant C as Client
  participant R as Relay (Claude)
  participant A as Claude API

  C->>R: Send messages (user/assistant/system)
  R->>R: Iterate messages
  R->>R: Aggregate system text pieces into []ClaudeMediaMessage
  Note right of R: systemMessages = [ {type:"text", text:...}, ... ]
  R->>A: POST ClaudeRequest { System: systemMessages, ... }
  A-->>R: Response
  R-->>C: Return response

Loading

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

I gathered whispers, one by one,
In baskets woven from setting sun—
System seeds now bundled neat,
Texty treats for Claude to eat.
Thump-thump! I hop, relay complete,
Many voices, one tidy beat. 🐇✨

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

relay/channel/claude/relay-claude.go (1)

277-299: System as array: solid change; add explicit handling for non-text blocks and consider normalizing message content arrays

The switch to accumulating system into []ClaudeMediaMessage is correct and aligns with Anthropic’s array format expectations. One improvement: non-text system blocks are silently dropped. Emit a lightweight log so operators can detect unexpected inputs.

Apply this within the system-content loop:

 for _, ctx := range message.ParseContent() {
   if ctx.Type == "text" {
     systemMessages = append(systemMessages, dto.ClaudeMediaMessage{
       Type: "text",
       Text: common.GetPointer[string](ctx.Text),
     })
   }
+  else {
+    // Surface unexpected system content types without failing the request.
+    common.SysLog(fmt.Sprintf("ignored non-text system content in system[]: type=%s", ctx.Type))
+  }
 }

Note: To fully match the PR goal of “messages/content 也采用数组形式”, also consider normalizing user/assistant string content to []ClaudeMediaMessage (see Line 349 where a plain string is still assigned). I can provide a follow-up patch if desired.

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📥 Commits

Reviewing files that changed from the base of the PR and between fbe7f35 and af94e11.

📒 Files selected for processing (1)

• relay/channel/claude/relay-claude.go (2 hunks)

🧰 Additional context used

🧬 Code graph analysis (1)

relay/channel/claude/relay-claude.go (2)

dto/claude.go (1)

• ClaudeMediaMessage (17-36)

common/utils.go (1)

• GetPointer (218-220)

🔇 Additional comments (1)

relay/channel/claude/relay-claude.go (1)

405-408: Ignore DTO shape concern — System is defined as any with json:"system,omitempty", so assigning a []dto.ClaudeMediaMessage is valid

Likely an incorrect or invalid review comment.