Stream Session Thread Events changedapi/beta/sessions/threads/events/stream
Nearest release: v2.1.294, published an hour after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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Lines+82added
Lines−2removed
From line
1,373
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits21to this page, all time
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from line 1373, old and new numbered
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13731373
13741374 - `BetaManagedAgentsSessionThreadCreatedEvent object`
13751375
1376 Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation.
1376 Emitted when a child thread is created. Written to the parent thread's output stream so clients observing the session see child creation.
13771377
13781378 - `type: "session.thread_created"`
13791379
from line 1849
18491849
18501850 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
18511851
1852 - `"claude-haiku-5-5"`
1853
1854 Fastest model for high-volume, real-time tasks
1855
18521856 - `"claude-sonnet-5-5"`
18531857
18541858 Efficient model for coding and agents
from line 2223
22192223
22202224 The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.
22212225
2226 - `url_sources: BetaManagedAgentsWebFetchURLSources or null`
2227
2228 Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source.
2229
2230 - `client_tool_results: BetaManagedAgentsWebFetchURLSourceToolFilter or null`
2231
2232 Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results.
2233
2234 - `BetaManagedAgentsWebFetchURLSourceAll object`
2235
2236 Every URL from this source may be fetched. This is the default.
2237
2238 - `type: "all"`
2239
2240 - `BetaManagedAgentsWebFetchURLSourceNone object`
2241
2242 This source contributes no URLs that may be fetched.
2243
2244 - `type: "none"`
2245
2246 - `BetaManagedAgentsWebFetchURLSourceOnly object`
2247
2248 Only the named tools' results contribute URLs that may be fetched.
2249
2250 - `type: "only"`
2251
2252 - `tools: array of BetaManagedAgentsWebFetchURLSourceToolReference`
2253
2254 The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results.
2255
2256 - `type: "tool_reference"`
2257
2258 Must be "tool_reference".
2259
2260 - `name: string`
2261
2262 Name of the tool. Compared exactly, so upper and lower case letters are different.
2263
2264 minLength: 1, maxLength: 128
2265
2266 - `BetaManagedAgentsWebFetchURLSourceExcept object`
2267
2268 Every tool's results contribute URLs that may be fetched, except the named tools' results.
2269
2270 - `type: "except"`
2271
2272 - `tools: array of BetaManagedAgentsWebFetchURLSourceToolReference`
2273
2274 The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results.
2275
2276 - `type: "tool_reference"`
2277
2278 Must be "tool_reference".
2279
2280 - `name: string`
2281
2282 Name of the tool. Compared exactly, so upper and lower case letters are different.
2283
2284 minLength: 1, maxLength: 128
2285
2286 - `server_tool_results: BetaManagedAgentsWebFetchURLSourceToolFilter or null`
2287
2288 Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both.
2289
2290 - `user_input: BetaManagedAgentsWebFetchURLSourceUserInput or null`
2291
2292 Whether URLs in the text of user messages may be fetched. Null when not set, which allows them.
2293
2294 - `BetaManagedAgentsWebFetchURLSourceAll object`
2295
2296 Every URL from this source may be fetched. This is the default.
2297
2298 - `BetaManagedAgentsWebFetchURLSourceNone object`
2299
2300 This source contributes no URLs that may be fetched.
2301
22222302 - `allowed_domains: optional array of string`
22232303
22242304 - `blocked_domains: optional array of string`
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26232703```json
26242704{
2625 "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy",
2705 "id": "sevt_011CZkZGPp1iBcp4kaQSihUm",
26262706 "content": [
26272707 {
26282708 "text": "Where is my order #1234?",
No line in this hunk matches that.