Sessions changedapi/beta/sessions
Nearest release: v2.1.281, published an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Recorded here
Lines+195added
Lines−71removed
From line
19
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits14to this page, all time
The whole hunk
from line 19, old and new numbered
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from line 19
1919
2020 - `string`
2121
22 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
22 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
2323
2424 - `"message-batches-2024-09-24"`
2525
from line 113
113113
114114 - `"compact-2026-09-04"`
115115
116 - `"inline-tools-2026-09-15"`
117
118 - `"mcp-client-2026-09-15"`
119
116120- `"anthropic-workspace-id": optional string`
117121
118122 Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`).
from line 183
179183
180184 Replacement model. Accepts the model string, e.g. `claude-opus-5`, or a `model_config` object. Omit to use the agent's model.
181185
182 - `BetaManagedAgentsModel = "claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more or string`
186 - `BetaManagedAgentsModel = "claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more or string`
183187
184188 The model that will power your agent.
185189
186190 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
187191
188 - `"claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more`
192 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
189193
190194 The model that will power your agent.
191195
192196 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
193197
198 - `"claude-opus-5-5"`
199
200 Powerful intelligence for coding, knowledge work, and long-running agents
201
194202 - `"claude-fable-5-1"`
195203
196204 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
from line 1191
11831191
11841192 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
11851193
1186 - `"claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more`
1194 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
11871195
11881196 The model that will power your agent.
11891197
11901198 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
11911199
1200 - `"claude-opus-5-5"`
1201
1202 Powerful intelligence for coding, knowledge work, and long-running agents
1203
11921204 - `"claude-fable-5-1"`
11931205
11941206 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
from line 2358
23462358
23472359 - `string`
23482360
2349 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
2361 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
23502362
23512363 - `"message-batches-2024-09-24"`
23522364
from line 2452
24402452
24412453 - `"compact-2026-09-04"`
24422454
2455 - `"inline-tools-2026-09-15"`
2456
2457 - `"mcp-client-2026-09-15"`
2458
24432459- `"anthropic-workspace-id": optional string`
24442460
24452461 Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`).
from line 2500
24842500
24852501 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
24862502
2487 - `"claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more`
2503 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
24882504
24892505 The model that will power your agent.
24902506
24912507 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
24922508
2509 - `"claude-opus-5-5"`
2510
2511 Powerful intelligence for coding, knowledge work, and long-running agents
2512
24932513 - `"claude-fable-5-1"`
24942514
24952515 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
from line 3593
35733593
35743594 - `string`
35753595
3576 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
3596 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
35773597
35783598 - `"message-batches-2024-09-24"`
35793599
from line 3687
36673687
36683688 - `"compact-2026-09-04"`
36693689
3690 - `"inline-tools-2026-09-15"`
3691
3692 - `"mcp-client-2026-09-15"`
3693
36703694- `"anthropic-workspace-id": optional string`
36713695
36723696 Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`).
from line 3735
37113735
37123736 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
37133737
3714 - `"claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more`
3738 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
37153739
37163740 The model that will power your agent.
37173741
37183742 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
37193743
3744 - `"claude-opus-5-5"`
3745
3746 Powerful intelligence for coding, knowledge work, and long-running agents
3747
37203748 - `"claude-fable-5-1"`
37213749
37223750 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
from line 4814
47864814
47874815 - `string`
47884816
4789 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
4817 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
47904818
47914819 - `"message-batches-2024-09-24"`
47924820
from line 4908
48804908
48814909 - `"compact-2026-09-04"`
48824910
4911 - `"inline-tools-2026-09-15"`
4912
4913 - `"mcp-client-2026-09-15"`
4914
48834915- `"anthropic-workspace-id": optional string`
48844916
48854917 Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`).
from line 5442
54105442
54115443 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
54125444
5413 - `"claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more`
5445 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
54145446
54155447 The model that will power your agent.
54165448
54175449 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
54185450
5451 - `"claude-opus-5-5"`
5452
5453 Powerful intelligence for coding, knowledge work, and long-running agents
5454
54195455 - `"claude-fable-5-1"`
54205456
54215457 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
from line 6525
64896525
64906526 - `string`
64916527
6492 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
6528 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
64936529
64946530 - `"message-batches-2024-09-24"`
64956531
from line 6619
65836619
65846620 - `"compact-2026-09-04"`
65856621
6622 - `"inline-tools-2026-09-15"`
6623
6624 - `"mcp-client-2026-09-15"`
6625
65866626- `"anthropic-workspace-id": optional string`
65876627
65886628 Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`).
from line 6676
66366676
66376677 - `string`
66386678
6639 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
6679 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
66406680
66416681 - `"message-batches-2024-09-24"`
66426682
from line 6770
67306770
67316771 - `"compact-2026-09-04"`
67326772
6773 - `"inline-tools-2026-09-15"`
6774
6775 - `"mcp-client-2026-09-15"`
6776
67336777- `"anthropic-workspace-id": optional string`
67346778
67356779 Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`).
from line 6818
67746818
67756819 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
67766820
6777 - `"claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more`
6821 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
67786822
67796823 The model that will power your agent.
67806824
67816825 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
67826826
6827 - `"claude-opus-5-5"`
6828
6829 Powerful intelligence for coding, knowledge work, and long-running agents
6830
67836831 - `"claude-fable-5-1"`
67846832
67856833 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
from line 7972
79247972
79257973 Replacement model. Accepts the model string, e.g. `claude-opus-5`, or a `model_config` object. Omit to use the agent's model.
79267974
7927 - `BetaManagedAgentsModel = "claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more or string`
7975 - `BetaManagedAgentsModel = "claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more or string`
79287976
79297977 The model that will power your agent.
79307978
79317979 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
79327980
7933 - `"claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more`
7981 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
79347982
79357983 The model that will power your agent.
79367984
79377985 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
79387986
7987 - `"claude-opus-5-5"`
7988
7989 Powerful intelligence for coding, knowledge work, and long-running agents
7990
79397991 - `"claude-fable-5-1"`
79407992
79417993 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
from line 8452
84008452
84018453 - `BetaManagedAgentsAutoPolicy object`
84028454
8403 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.
8404
8405 - `user_location: optional BetaManagedAgentsUserLocation or null`
8406
8407 Approximate user location for search result localization.
8408
8409 - `type: "approximate"`
8410
8411 Location precision. Only "approximate" is supported.
8412
8413 - `city: optional string or null`
8414
8415 City name.
8416
8417 minLength: 1, maxLength: 255
8418
8419 - `country: optional string or null`
8420
8421 Two-letter ISO 3166-1 country code, uppercase.
8422
8423 - `region: optional string or null`
8424
8425 Region or state name.
8426
8427 minLength: 1, maxLength: 255
8428
8429 - `timezone: optional string or null`
8430
8431 IANA timezone identifier, e.g. "America/Los_Angeles".
8432
8433 minLength: 1, maxLength: 255
8434
8435 - `default_config: optional BetaManagedAgentsAgentToolsetDefaultConfigParams or null`
8436
8437 Default configuration for all tools in a toolset.
8438
8439
8455
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