Get a version

Returns one version, by `ver_` ID or number, with its full definition.

GET /v1/routines/{routine}/versions/{version}
Returns one version, by `ver_` ID or number, with its full definition.

Authentication

Bearer Token (b3os_sk_ API key or b3os_pat_ token) API Key (cookie: __Host-b3os_session)

Path Parameters

routine string required path
A routine ID (`rtn_…`) or name. Names are unique per project; `runs`, `hooks`, `validate` and `import` are reserved and cannot be routine names.
Example: "nightly-digest"
version string required path
A `ver_` ID or a version number.
Example: "2"

Responses

200 The version.
application/json
id string REQUIRED
object string REQUIRED
Enum: routine_version
routine_id string REQUIRED
number integer REQUIRED
active boolean REQUIRED
published_by string | null REQUIRED
The key ID that published this version.
scopes string[] REQUIRED
The publisher's scopes, snapshotted; runs of this version get at most these.
Array of: string
created_at string (date-time) REQUIRED
definition object
A routine as sent to PUT /v1/routines/{id} (ARCHITECTURE 5.4). GitHub-Actions-shaped: triggers, defaults and an ordered list of steps; expressions are CEL inside ${{ }}. Steps run in array order unless a step lists needs. Contexts, status functions, template rules and the divergences from GitHub Actions are in packages/spec/schemas/README.md. Compile-time rules JSON Schema cannot express (unique ids, needs pointing at earlier steps, references only to ancestors, retry forbidden on irreversible steps) are listed there under 'Routine publish checks'. Owner after freeze: routines.
$schema string (uri)
Optional pointer to this schema for editors.
name string REQUIRED
Routine slug, unique within the project. Used by the CLI (b3os routine deploy); an MCP server that lists routines as tools names the tool routine_<name> with - mapped to _. runs, hooks, validate and import are reserved: they are API paths under /v1/routines.
description string
What the routine does; an MCP server that lists routines as tools uses it as the tool description.
inputs object | boolean & object
JSON Schema 2020-12 for the run input, available as inputs. Defaults declared here are applied before the run starts. Absent: the run takes no input ({}).
output unknown
The run's result, evaluated once after every step has finished and the run succeeded. Absent: the result is {}. Context: inputs, vars, env, trigger, run, steps (all).
env object
Non-secret strings evaluated once at run start (context: inputs, vars, trigger, run) and exposed as env.<NAME>. Not passed to sandboxes implicitly; put what a step needs in its with.
vars object
Read-only JSON constants exposed as vars.<name>. Values are literals; strings in them are not evaluated as templates.
triggers object[]
How runs start besides POST /v1/routines/{id}/runs. Triggers switch atomically when a new version is published. Action triggers are trigger subscriptions (tsub_): publishing a version creates or updates them, and a rollback or delete removes them (README, 'Pack triggers').
Array of:
type unknown REQUIRED
Enum: cron, interval, webhook, action
id string REQUIRED
A CEL identifier (so steps.<id>.outputs parses): lowercase letters, digits and _, not a CEL reserved word.
uses string
action only: the pack trigger to subscribe to.
with object
cron, interval, webhook: the run input built from the event (context: trigger, vars), validated against inputs; absent: {} plus input defaults. action: the pack trigger's configuration, validated against its configSchema and evaluated once when the version is published (context: vars only); action runs start with {} plus input defaults and read the event from trigger.data.
connections object
action only: binds the pack trigger's connection keys (its requires.connections) to vault connections. A key left out is resolved when the version is published (the most recently created connection for that pack the publishing key may use) and pinned in the subscription; when there is none the publish fails with routine_invalid.
if string
Start a run only when true (context: trigger, vars). A webhook delivery that does not match is acknowledged with 202 and starts nothing; an action event that does not match is dropped. Status functions are not available here.
cron string
Six fields with seconds: second minute hour day-of-month month day-of-week, single spaces. Numbers, names (JAN, MON), *, a-b, a,b, */n and ? are accepted; L, W and # in the day fields.
tz string
IANA zone for cron, default UTC. A local time skipped by a DST change fires at the first instant after the gap; a local time that occurs twice fires once, at its first occurrence.
every_ms integer
Interval period. Plans may raise the floor (GET /v1/limits).
anchor unknown
interval: epoch fires at Unix-epoch multiples of every_ms (clock aligned); publish fires every_ms after the version became active, then every every_ms.
Enum: epoch, publish
catch_up unknown
Occurrences missed while the node was down or the routine was paused: skip runs none, latest runs only the newest one, all runs each one in order. Only occurrences inside catch_up_window_s count. Required on every schedule (ARCHITECTURE 8).
Enum: skip, latest, all
catch_up_window_s integer
overlap unknown
When an occurrence fires while a run started by this trigger is still active: skip drops it, buffer_one keeps at most one pending occurrence (a newer one replaces it), allow starts it anyway, cancel_running cancels the active run first. defaults.concurrency still applies on top.
Enum: skip, buffer_one, allow, cancel_running
verify object
Mandatory verification for POST /v1/routines/hooks/{hk_id} (ARCHITECTURE 4.3); the hk_ id is created when the version is published. b3os: B3OS-Signature 't=<unix>,v1=<hex HMAC-SHA256(secret, "<t>.<body>")>' with a per-hook secret B3OS generates (shown once by the API). github, stripe, slack, standard_webhooks: the provider's scheme as in b3pack verify. hmac_sha256: generic, and always timestamped: the signature covers '<value of timestamp_header>.<body>', and a delivery whose timestamp header is missing or not a Unix time is refused. Timestamped schemes reject deliveries more than tolerance_s (at most 300 s) from the node clock. Secrets never appear in the URL.
scheme unknown REQUIRED
Enum: b3os, github, stripe, slack, standard_webhooks, hmac_sha256
secret string
An api_key vault connection whose api_key field holds the provider's signing secret (vault.yaml field names). Store it as a verification-only connection, without pack and without hosts: B3OS reads it to check signatures, and a connection with no hosts is never injected into any request. Not used with b3os.
header string
encoding unknown
Enum: hex, base64
prefix string
timestamp_header string
hmac_sha256 only, and required there: header carrying the delivery's Unix timestamp.
tolerance_s integer
dedupe string
webhook: string key; a second delivery with the same key within 24 h returns the first delivery's response and starts nothing. Default per scheme: github X-GitHub-Delivery, stripe body.id, slack body.event_id, standard_webhooks webhook-id, b3os the Idempotency-Key header or else the v1 signature, hmac_sha256 none (then dedupe is required).
defaults object
durability unknown
ephemeral: memory only, nothing journaled (the agent tool-call fast path; a crash loses the run). standard: group-commit journal, effects durable before dependents run. strict: intent and result commits for every effect step (ARCHITECTURE 4.9, 5.4). A run may request a different tier at start.
Enum: ephemeral, standard, strict
timeout_ms integer
Default timeout for uses and map steps that do not set timeout_ms. Wait and sleep steps are not affected.
retry object
Default retry policy, applied only to steps whose effect class is pure or read. A write step retries only when it sets retry itself; an irreversible step never retries.
max_attempts integer REQUIRED
Total attempts including the first.
initial_ms integer
factor number
max_ms integer
jitter boolean
concurrency object
Admission for runs of this routine, shaped like GitHub's concurrency. At most limit runs are active per group; on_limit decides what a new run does when the group is full.
limit integer REQUIRED
group string
Group key evaluated at run start (context: inputs, vars, trigger). Default: one group for the routine.
on_limit unknown
queue: wait (FIFO) for a free slot. skip: the new run ends canceled with reason concurrency_skipped. cancel_running: cancel the oldest active run in the group, then start.
Enum: queue, skip, cancel_running
steps (unknown | unknown | unknown | unknown)[] REQUIRED
Array of:
One of:
Option 1unknown
Option 2unknown
Option 3unknown
Option 4unknown
400 The request failed validation (`invalid_request`, `invalid_url`).
401 Missing, malformed, expired or revoked credentials (`unauthorized`).
403 Authenticated but not allowed (`forbidden`, `egress_denied`).
404 No such routine or version (`routine_not_found`, `routine_version_not_found`).
429 A rate, concurrency or quota limit applies (`rate_limited`, `concurrency_limited`, `quota_exceeded`).
500 Something failed inside B3OS (`internal`). Retry with backoff.
503 The node or the product is not available right now (`node_unavailable`, `product_unavailable`, `capacity_unavailable`). 
curl -X GET 'https://beta-api.b3os.org/v1/routines/nightly-digest/versions/2' \  -H 'Authorization: Bearer YOUR_API_TOKEN'
const response = await fetch('https://beta-api.b3os.org/v1/routines/nightly-digest/versions/2', {  method: 'GET',  headers: {      "Authorization": "Bearer YOUR_API_TOKEN"  }});const data = await response.json();console.log(data);
import requestsheaders = {    'Authorization': 'Bearer YOUR_API_TOKEN'}response = requests.get('https://beta-api.b3os.org/v1/routines/nightly-digest/versions/2', headers=headers)print(response.json())
200 Response 
{  "id": "ver_01m5t6ncrsssrysy1p2fbn2pgf",  "object": "routine_version",  "routine_id": "rtn_01m5t6vhkw4a8fa4tb5w4ffz37",  "number": 2,  "active": true,  "published_by": "key_01m5t5gb92a5zncjx654gevx4p",  "scopes": [    "vision:run",    "infer:run"  ],  "created_at": "2026-10-25T19:20:00.000Z",  "definition": {    "name": "nightly-digest",    "steps": [      {        "id": "page",        "uses": "vision/scrape@1",        "with": {          "url": "https://news.example.com"        }      }    ]  }}
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