feat(web_search): add Volcengine Ark search provider
Add Volcengine (火山引擎) as a new SearchProvider in web_search tool.
Uses Volcengine's Responses API with `tools: [{type: "web_search"}]`
and strict JSON prompt constraints to extract structured search results.
- Free tier: 20K queries/month per API key
- API key resolution: [search] api_key → VOLCENGINE_API_KEY →
VOLCENGINE_ARK_API_KEY → ARK_API_KEY env vars
- Select via `DEEPSEEK_SEARCH_PROVIDER=volcengine` or
`[search] provider = "volcengine"` in config.toml
Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
implecao
+3
-1
@@ -308,7 +308,7 @@ max_subagents = 10 # optional (1-20)
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# API-backed search.
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#
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# [search]
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# provider = "duckduckgo" # duckduckgo | bing | tavily | bocha | metaso | baidu
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# provider = "duckduckgo" # duckduckgo | bing | tavily | bocha | metaso | baidu | volcengine
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# # duckduckgo: HTML scrape with Bing fallback
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# # bing: HTML scrape, no API key
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# # tavily: https://tavily.com — AI search, needs api_key
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@@ -316,6 +316,8 @@ max_subagents = 10 # optional (1-20)
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# # metaso: https://metaso.cn — 秘塔AI搜索，每天 100 次免费
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# # 设置 METASO_API_KEY 或 [search] api_key 可提升额度
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# # baidu: 百度 AI Search via qianfan.baidubce.com，需 api_key
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# # volcengine: 火山引擎 Ark web_search (免费 2 万次/月), 需 api_key
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# # 也回退到 VOLCENGINE_API_KEY / VOLCENGINE_ARK_API_KEY / ARK_API_KEY 环境变量
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# api_key = "YOUR_SEARCH_KEY" # required for tavily, bocha, and baidu; optional for metaso
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# # WARNING: treat config.toml like a secret file when
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# # storing API keys. Prefer env vars for local smoke tests.
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@@ -755,6 +755,12 @@ pub enum SearchProvider {
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alias = "baidu-ai-search"
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)]
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Baidu,
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/// Volcengine Ark web_search via Responses API. Requires api_key.
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/// Free tier: 20K queries/month per API key. Falls back to
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/// `VOLCENGINE_API_KEY` / `VOLCENGINE_ARK_API_KEY` / `ARK_API_KEY`
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/// env vars when `[search] api_key` is not set.
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#[serde(alias = "volcengine", alias = "ark", alias = "volc")]
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Volcengine,
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}
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impl SearchProvider {
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@@ -769,6 +775,7 @@ impl SearchProvider {
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"baidu" | "baidu-search" | "baidu_search" | "baidu-ai-search" | "baidu_ai_search" => {
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Some(Self::Baidu)
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}
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"volcengine" | "ark" | "volc" | "volcengine-ark" => Some(Self::Volcengine),
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_ => None,
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}
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}
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@@ -782,6 +789,7 @@ impl SearchProvider {
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Self::Bocha => "bocha",
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Self::Metaso => "metaso",
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Self::Baidu => "baidu",
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Self::Volcengine => "volcengine",
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}
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}
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}
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@@ -813,12 +821,13 @@ pub struct SearchProviderResolution {
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/// Web search provider configuration (`[search]` table in config.toml).
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#[derive(Debug, Clone, Deserialize, Default)]
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pub struct SearchConfig {
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/// Search provider: `bing` | `duckduckgo` | `tavily` | `bocha` | `metaso` | `baidu`. Default: `duckduckgo`.
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/// Search provider: `bing` | `duckduckgo` | `tavily` | `bocha` | `metaso` | `baidu` | `volcengine`. Default: `duckduckgo`.
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#[serde(default)]
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pub provider: Option<SearchProvider>,
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/// API key for Tavily, Bocha, Metaso, or Baidu. Not required for Bing or DuckDuckGo.
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/// API key for Tavily, Bocha, Metaso, Baidu, or Volcengine. Not required for Bing or DuckDuckGo.
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/// Metaso also falls back to `METASO_API_KEY` env var, then a built-in default.
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/// Baidu also falls back to `BAIDU_SEARCH_API_KEY` env var.
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/// Volcengine also falls back to `VOLCENGINE_API_KEY` / `VOLCENGINE_ARK_API_KEY` / `ARK_API_KEY` env vars.
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#[serde(default)]
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pub api_key: Option<String>,
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}
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@@ -1,12 +1,12 @@
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//! Web search tool backed by multiple providers: Bing HTML scrape, DuckDuckGo
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//! (HTML scrape with Bing fallback), Tavily API, Bocha (博查) API,
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//! Metaso API (<https://metaso.cn>), and Baidu AI Search.
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//! Metaso API (<https://metaso.cn>), Baidu AI Search, and Volcengine Ark.
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//!
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//! This is the primary web search surface for agents. For browsing workflows
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//! (page open, click, screenshot) use a direct URL approach instead.
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//!
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//! Set `[search]` in config.toml to switch providers:
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//! provider = "duckduckgo" # or tavily/bocha/metaso/baidu
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//! provider = "duckduckgo" # or tavily/bocha/metaso/baidu/volcengine
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//! api_key = "tvly-..."
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use super::spec::{
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@@ -28,6 +28,7 @@ const TAVILY_ENDPOINT: &str = "https://api.tavily.com/search";
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const BOCHA_ENDPOINT: &str = "https://api.bochaai.com/v1/ai/search";
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const METASO_ENDPOINT: &str = "https://metaso.cn/api/v1";
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const BAIDU_ENDPOINT: &str = "https://qianfan.baidubce.com/v2/ai_search/web_search";
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const VOLCENGINE_RESPONSES_ENDPOINT: &str = "https://ark.cn-beijing.volces.com/api/v3/responses";
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/// Intentionally public default key provided by Metaso for open-source/community use.
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/// Last-resort fallback after config and env var. Rate-limited to ~100 searches/day.
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const METASO_DEFAULT_API_KEY: &str = "mk-E384C1DD5E8501BB7EFE27C949AFDE5B";
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@@ -226,6 +227,13 @@ impl ToolSpec for WebSearchTool {
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.run_baidu_search(&query, max_results, timeout_ms, context)
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.await;
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}
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SearchProvider::Volcengine => {
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let decider = context.network_policy.as_ref();
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check_policy(decider, "ark.cn-beijing.volces.com")?;
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return self
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.run_volcengine_search(&query, max_results, timeout_ms, context)
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.await;
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}
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SearchProvider::Bing | SearchProvider::DuckDuckGo => {}
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}
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@@ -728,6 +736,84 @@ impl WebSearchTool {
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let results = parse_baidu_results(&parsed, max_results);
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search_tool_result(query.to_string(), "baidu", results, None)
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}
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/// Search via Volcengine Ark Responses API web_search tool.
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/// Uses strict JSON prompt constraints to extract structured results
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/// from the model's search-augmented response.
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async fn run_volcengine_search(
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&self,
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query: &str,
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max_results: usize,
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timeout_ms: u64,
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context: &ToolContext,
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) -> Result<ToolResult, ToolError> {
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let volc_key = std::env::var("VOLCENGINE_API_KEY").ok();
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let volc_ark_key = std::env::var("VOLCENGINE_ARK_API_KEY").ok();
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let ark_key = std::env::var("ARK_API_KEY").ok();
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let api_key = context
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.search_api_key
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.as_deref()
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.or(volc_key.as_deref())
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.or(volc_ark_key.as_deref())
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.or(ark_key.as_deref())
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.ok_or_else(|| {
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ToolError::execution_failed(
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"Volcengine search requires an API key. Set `[search] api_key`, \
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or DEEPSEEK_SEARCH_API_KEY, or VOLCENGINE_API_KEY env var.",
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)
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})?;
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let client = reqwest::Client::builder()
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.timeout(Duration::from_millis(timeout_ms))
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.build()
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.map_err(|e| {
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ToolError::execution_failed(format!("Failed to build HTTP client: {e}"))
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})?;
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let payload = volcengine_search_payload(query, max_results);
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let resp = client
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.post(VOLCENGINE_RESPONSES_ENDPOINT)
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.header("Authorization", format!("Bearer {api_key}"))
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.json(&payload)
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.send()
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.await
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.map_err(|e| {
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ToolError::execution_failed(format!("Volcengine search request failed: {e}"))
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})?;
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let status = resp.status();
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let body = resp.text().await.map_err(|e| {
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ToolError::execution_failed(format!("Failed to read Volcengine response: {e}"))
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})?;
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if !status.is_success() {
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let msg = match status.as_u16() {
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401 | 403 => "Volcengine API key rejected — check VOLCENGINE_API_KEY or `[search] api_key` in config.toml".to_string(),
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429 => "Volcengine API rate-limited — wait and retry, or check your quota".to_string(),
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_ => {
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let truncated = truncate_error_body(&body);
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format!("Volcengine search failed: HTTP {} — {truncated}", status.as_u16())
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}
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};
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return Err(ToolError::execution_failed(msg));
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}
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let parsed: serde_json::Value = serde_json::from_str(&body).map_err(|e| {
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ToolError::execution_failed(format!("Failed to parse Volcengine response: {e}"))
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})?;
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if let Some(error) = volcengine_error_message(&parsed) {
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return Err(ToolError::execution_failed(error));
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}
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let response_text = volcengine_extract_text(&parsed).ok_or_else(|| {
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ToolError::execution_failed("Volcengine response contains no output text")
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})?;
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let results = parse_volcengine_results(&response_text, max_results);
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search_tool_result(query.to_string(), "volcengine", results, None)
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}
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}
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fn truncate_error_body(body: &str) -> String {
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@@ -826,6 +912,118 @@ fn baidu_search_payload(query: &str, max_results: usize) -> Value {
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})
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}
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fn volcengine_search_payload(query: &str, max_results: usize) -> Value {
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json!({
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"model": "doubao-seed-1-6-250615",
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"stream": false,
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"tools": [{"type": "web_search"}],
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"input": [{
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"role": "user",
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"content": [{
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"type": "input_text",
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"text": format!(
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"Search the web for: {query}\n\n\
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CRITICAL: Respond ONLY with a valid JSON object. No markdown, no explanation.\n\
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Schema: {{\"results\":[{{\"title\":\"...\",\"url\":\"https://...\",\"snippet\":\"...\"}}]}}\n\
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- results: 1-{max_results} most relevant pages\n\
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- title: page title (required)\n\
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- url: full URL starting with https:// (required)\n\
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- snippet: 1-2 sentence factual summary (required)\n\
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- If zero results: {{\"results\":[]}}\n\
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- Your entire response must be valid, parseable JSON."
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)
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}]
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}]
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})
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}
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/// Extracts the model's text response from a Volcengine Responses API output.
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fn volcengine_extract_text(parsed: &Value) -> Option<String> {
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parsed
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.get("output")
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.and_then(|v| v.as_array())
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.into_iter()
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.flat_map(|arr| arr.iter().rev())
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.find(|item| item.get("type").and_then(|t| t.as_str()) == Some("message"))
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.and_then(|msg| msg.get("content").and_then(|c| c.as_array()))
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.and_then(|content| content.first())
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.and_then(|c| c.get("text").and_then(|t| t.as_str()))
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.map(|s| s.to_string())
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}
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/// Checks for business-logic errors in a Volcengine Responses API response.
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fn volcengine_error_message(parsed: &Value) -> Option<String> {
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let error = parsed.get("error")?;
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let code = error
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.get("code")
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.and_then(|v| v.as_str())
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.unwrap_or("unknown");
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let message = error
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.get("message")
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.and_then(|v| v.as_str())
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.unwrap_or("no details");
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Some(format!("Volcengine API error (code {code}: {message})"))
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}
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/// Parses Volcengine model-generated JSON results into `WebSearchEntry` items.
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fn parse_volcengine_results(response_text: &str, max_results: usize) -> Vec<WebSearchEntry> {
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let json_text = extract_json_block(response_text).unwrap_or(response_text);
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let parsed: Value = match serde_json::from_str(json_text) {
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Ok(v) => v,
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Err(_) => return Vec::new(),
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};
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parsed
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.get("results")
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.and_then(|v| v.as_array())
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.into_iter()
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.flat_map(|arr| arr.iter())
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.filter_map(|item| {
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let title = item
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.get("title")
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.and_then(|s| s.as_str())?
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.trim();
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let url = item
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.get("url")
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.and_then(|s| s.as_str())?
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.trim();
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if title.is_empty() || url.is_empty() {
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return None;
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}
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let snippet = item
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.get("snippet")
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.and_then(|s| s.as_str())
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.map(str::trim)
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.filter(|s| !s.is_empty())
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.map(ToString::to_string);
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Some(WebSearchEntry {
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title: title.to_string(),
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url: url.to_string(),
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snippet,
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})
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})
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.take(max_results)
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.collect()
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}
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/// Attempts to extract a JSON block from text that may be wrapped in
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/// markdown fences (```json ... ```) or contain surrounding commentary.
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fn extract_json_block(text: &str) -> Option<&str> {
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if let Some(start) = text.find("```json") {
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let inner = &text[start + 7..];
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if let Some(end) = inner.find("```") {
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return Some(inner[..end].trim());
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}
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}
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if let Some(start) = text.find('{') {
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if let Some(end) = text.rfind('}') {
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return Some(&text[start..=end]);
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}
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}
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None
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}
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fn extract_search_query(input: &Value) -> Result<String, ToolError> {
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for key in ["query", "q"] {
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if let Some(value) = input.get(key) {
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