Sessions that name the environment WITHOUT pinning a version resolve here
from now on. Sessions already opened are untouched: the version they ran
against is stamped on the row and nothing re-resolves it.
Idempotent, and the outgoing default is cleared in the same transaction.
Workspace API key as a bearer token: Authorization: Bearer ish_sk_live_.... Keys are workspace-scoped machine principals minted in Settings > Developers (shown once at mint). Scopes: sessions:run (create a session, submit turns, close), sessions:read (read the session and its decision trace), environments:read and environments:write (manage the workspace's registered environments), tasks:read and tasks:write (manage the workspace's registered tasks), people:read and people:write (the people the workspace can run a session for), and usage:read (the workspace's own consumption, spend limits and rate-limit budgets). A key is minted with sessions:run, sessions:read, and tasks:read by default; every other scope must be requested, people:read and usage:read included. An ish user access token also works on the same header for personal scripts.
Set when the variant is archived. An archived version stays readable and comparable so its stored runs keep resolving, is hidden from the default list, refuses new sessions, and frees its label for reuse.
The config a run pinned to this version operates under: this version's config when set, otherwise the environment's. Provided so callers never re-implement the replace rule.
Whether a session that names this environment WITHOUT pinning a version resolves here. At most one live default per environment; an environment with no default resolves unversioned.
Monotonic per environment, server-assigned, and never reused, even after the variant is archived.
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Mint a key that includes it; an ish user access token is unconstrained by scopes.","headers":{"X-Request-Id":{"description":"Per-response correlation id, present on EVERY response (success and error). Error bodies echo it as `request_id`.","schema":{"type":"string"}},"x-ratelimit-limit":{"description":"Ceiling for the rate-limit window this request charged. Present on responses made with an API key against a rate-limited operation, including the `429` itself; absent for user access tokens (which carry no per-key budget) and when the rate-limit backend could not be read.","schema":{"type":"integer"}},"x-ratelimit-remaining":{"description":"Requests left in that window AFTER this one was counted. Pace off this rather than waiting for a `429`.","schema":{"type":"integer"}},"x-ratelimit-reset":{"description":"**Seconds from now** until that window resets (a delta, NOT a Unix timestamp). Measured when the response is written. 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A request-shape failure uses the `ValidationError` envelope; a handler-raised domain-validation refusal uses the `Error` envelope.","headers":{"X-Request-Id":{"description":"Per-response correlation id, present on EVERY response (success and error). Error bodies echo it as `request_id`.","schema":{"type":"string"}},"x-ratelimit-limit":{"description":"Ceiling for the rate-limit window this request charged. Present on responses made with an API key against a rate-limited operation, including the `429` itself; absent for user access tokens (which carry no per-key budget) and when the rate-limit backend could not be read.","schema":{"type":"integer"}},"x-ratelimit-remaining":{"description":"Requests left in that window AFTER this one was counted. Pace off this rather than waiting for a `429`.","schema":{"type":"integer"}},"x-ratelimit-reset":{"description":"**Seconds from now** until that window resets (a delta, NOT a Unix timestamp). Measured when the response is written. Omitted on the rare occasion the reset instant could not be read, while `limit` and `remaining` are still published.","schema":{"type":"integer"}}},"exampleType":"generated"},"edc8d137-52b5-4a53-b16d-1da17c66ec94":{"content":{"application/json":{"schema":{"description":"Generic error envelope for 4xx/5xx responses other than request-shape validation.","properties":{"detail":{"oneOf":[{"type":"string","title":"Detail","description":"A human-readable message, OR a structured object carrying a machine-readable `error_kind` (e.g. `idempotency_conflict`, `turn_index_mismatch`, `decision_invalid`).","isRequired":true,"uniqueKey":"detail.oneOf.0","typeLabel":"string"},{"type":"object","title":"Detail","description":"A human-readable message, OR a structured object carrying a machine-readable `error_kind` (e.g. `idempotency_conflict`, `turn_index_mismatch`, `decision_invalid`).","additionalProperties":true,"isRequired":true,"uniqueKey":"detail.oneOf.1","typeLabel":"Detail · object"}],"isRequired":true,"uniqueKey":"detail","typeLabel":"string | Detail · object"},"request_id":{"description":"Correlation id; identical to the `X-Request-Id` response header. Quote it in support requests.","title":"Request Id","type":"string","isRequired":true,"uniqueKey":"request_id","typeLabel":"string"},"docs_url":{"description":"Link to this error's entry in the error catalog. Present whenever `detail` carries a registered `error_kind`; absent on unclassified errors.","title":"Docs Url","type":"string","uniqueKey":"docs_url","typeLabel":"string"}},"required":["detail","request_id"],"title":"Error","type":"object","uniqueKey":"","typeLabel":"Error · object"},"examples":{"Example":{"title":"Example","value":{"detail":"\u003cstring>","request_id":"\u003cstring>","docs_url":"\u003cstring>"}}},"exampleType":"generated"}},"description":"The API key's request rate limit is exceeded (`detail.error_kind = 'rate_limited'`). Transient: retry after the `Retry-After` interval, also echoed as `detail.retry_after_seconds`. Not applied to user access tokens.","headers":{"X-Request-Id":{"description":"Per-response correlation id, present on EVERY response (success and error). Error bodies echo it as `request_id`.","schema":{"type":"string"}},"x-ratelimit-limit":{"description":"Ceiling for the rate-limit window this request charged. Present on responses made with an API key against a rate-limited operation, including the `429` itself; absent for user access tokens (which carry no per-key budget) and when the rate-limit backend could not be read.","schema":{"type":"integer"}},"x-ratelimit-remaining":{"description":"Requests left in that window AFTER this one was counted. Pace off this rather than waiting for a `429`.","schema":{"type":"integer"}},"x-ratelimit-reset":{"description":"**Seconds from now** until that window resets (a delta, NOT a Unix timestamp). Measured when the response is written. 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A key is minted with `sessions:run`, `sessions:read`, and `tasks:read` by default; every other scope must be requested, `people:read` and `usage:read` included. An ish user access token also works on the same header for personal scripts.","scheme":"bearer","type":"http","scopes":[],"schemeName":"bearerAuth"}}},"servers":{"22c3a961-b6d9-4922-b5aa-d0aac292aa39":{"description":"Production","url":"https://api.ishlabs.io"}},"processedSecurityOptions":[{"schemes":[{"scheme":{"description":"Workspace API key as a bearer token: `Authorization: Bearer ish_sk_live_...`. Keys are workspace-scoped machine principals minted in Settings > Developers (shown once at mint). 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Keys are workspace-scoped machine principals minted in Settings > Developers (shown once at mint). Scopes: `sessions:run` (create a session, submit turns, close), `sessions:read` (read the session and its decision trace), `environments:read` and `environments:write` (manage the workspace's registered environments), `tasks:read` and `tasks:write` (manage the workspace's registered tasks), `people:read` and `people:write` (the people the workspace can run a session for), and `usage:read` (the workspace's own consumption, spend limits and rate-limit budgets). A key is minted with `sessions:run`, `sessions:read`, and `tasks:read` by default; every other scope must be requested, `people:read` and `usage:read` included. An ish user access token also works on the same header for personal scripts.","format":"bearer","typeLabel":"string\u003cbearer>","deprecated":false},"schemeName":"bearerAuth","name":"Authorization"}],"title":"bearerAuth"}]},"originalFileLocation":"api/openapi.public.json"},"subdomain":"ish","siteName":"ish","title":"Set Default Environment Version - ish","navMaps":{"firstHrefInVersion":{},"firstHrefInLanguage":{}},"lastModified":"2026-10-08T15:42:21.280Z","originalFileLocation":"api/reference/environments/set-default-environment-version.mdx"},"headHtml":"\u003cscript data-mint-head>(function(){var d=document.documentElement,p=null;if(!p){try{p=localStorage.getItem(\"isDarkMode\")}catch(e){}if(p==='true')p='dark';else if(p==='false')p='light';if(p!=='light'\u0026\u0026p!=='dark'\u0026\u0026p!=='system')p=\"system\"}var r=p==='system'?(matchMedia(\"(prefers-color-scheme: dark)\").matches?'dark':'light'):p;d.classList.remove(r==='dark'?'light':'dark');d.classList.add(r);d.setAttribute(\"data-theme-preference\",p)})();\u003c/script>\u003cmeta data-mint-head name=\"description\" content=\"Point this environment\u0026#x27;s default at this variant. 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