Console

Start

Platform

Agents

App store purchases

Auth

Builds

Credits

Database

Flags

Generated Assets

Hosting

Jobs and cron

Knowledge

Localization

Monitoring

Network

Notifications

Organizations

Queues

Realtime

Runners

Sandboxes

Storage

Webhooks

Workflows

Getting Started

Installation

Authentication

AI Services

KV Store

Overview

Webhooks

Deploy & Infrastructure

Reference

On this page

Request
Response
AgentVersion
ResourceMeta
AgentSpec
Tool
McpServer
Skill
ToolPolicy
AgentBudget
EnvironmentSpec
Errors
Examples

Reference

List agent versions

Lists an agent's versions, newest first.

Checked 2026-09-28

Lists an agent's versions, newest first.

Not available yet. Sylphx Agents is declared in the registry but no backend serves it: every call answers 501 with the problem code UNIMPLEMENTED.

Path GET https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/agents/agent/agent_versions
Scope agents:read
Effect read — nothing is written.
Collection agent_versions
Query page_size, page_token, filter
Pagination the answer carries agent_versions and, when there is more, next_page_token

#Request

Field	Type	What it is
`parent`	`string`	The agent to list in. Required.
`page_size`	`int32`	At most this many; default 50, clamped to 1000.
`page_token`	`string`	`next_page_token` of the previous page.
`filter`	`string`	AIP-160 filter, limited to `version_number`.

#Response

Field	Type	What it is
`agent_versions`	`AgentVersion[]`	The page.
`next_page_token`	`string`	The token of the next page; empty on the last page.

#AgentVersion

Field	Type	What it is
`name`	`string`	`orgs/{org}/projects/{project}/envs/{env}/agents/{agent}/agent_versions/{agent_version}`.
`uid`	`string`	`agv_<cell><ulid>`; never reused. Output only.
`meta`	`ResourceMeta`	Resource metadata.
`version_number`	`int64`	The version number within the agent, from 1, with no gaps. Output only.
`spec`	`AgentSpec`	The definition, frozen. Output only.
`agent_generation`	`int64`	The Agent generation that minted it. Output only.
`create_time`	`timestamp`	When it was minted. Output only.

#ResourceMeta

Field	Type	What it is
`generation`	`int64`	Increases by one on every change to `spec`. Output only.
`etag`	`string`	Strong ETag (AIP-154): changes on any change to spec, status, or metadata. Send it back as `If-Match` or `etag` to make Update and Delete conditional; a mismatch fails with ABORTED / 409 `ETAG_MISMATCH`. Output only.
`create_time`	`timestamp`	When the Resource was created. Output only.
`update_time`	`timestamp`	When the Resource last changed. Output only.
`delete_time`	`timestamp`	Set while the Resource is being deleted. Output only.
`labels`	`map<string, string>`	Caller-writable, indexed labels (AIP-122 label rules).
`annotations`	`map<string, string>`	Caller-writable, unindexed annotations.
`display_name`	`string`	Caller-writable human-readable name.
`creator`	`string`	The principal that created the Resource. Output only.

#AgentSpec

Field	Type	What it is
`model`	`string`	The exact Sylphx AI catalog id (`ai_models`), set per Agent through the API as runtime state, never code or a deployed file. Agents in the same environment may use different models; the harness never remaps this id. Required.
`instructions`	`string`	The system instructions, at most 256 KiB.
`tools`	`Tool[]`	The tools the agent may call, at most 128, each `name` once.
`mcp_servers`	`McpServer[]`	The MCP servers whose tools the agent may call, at most 32.
`skills`	`Skill[]`	Skills: instruction packs the agent loads when relevant, at most 64.
`memory_stores`	`string[]`	The memory stores the agent recalls from and writes to, as MemoryStore names; at most 8.
`tool_policy`	`ToolPolicy`	The policy every tool call passes before it runs.
`budget`	`AgentBudget`	Spend and time limits per turn and per session.
`end_user_access`	`bool`	Whether end-user session access is intended for this agent. Reserved until the backend enforces end-user ownership; all contract methods currently require a secret key.
`environment`	`EnvironmentSpec`	Whether sessions get a Sylphx Sandboxes environment (shell, files, browser, computer use), attached on first need and put in standby when idle.
`harness`	`string`	The execution harness, independent of `model`: `runtime` (default), `claude_code` or `codex`. It is part of the immutable version, not an environment-wide setting. An omitted or empty value means `runtime`.

#Tool

Field	Type	What it is
`name`	`string`	The name the model calls, unique within the agent. Required.
`description`	`string`	What the tool does, shown to the model; at most 4096 characters.
`input_schema`	`struct`	The JSON Schema of the tool's input. Built-in tools carry their own.
`builtin`	`BuiltinTool`	A platform tool: `shell`, `files`, `browser`, `computer`, `web_fetch`, `web_search` or `memory`. One of the `kind` group.
`http`	`HttpTool`	An HTTP API described by OpenAPI. One of the `kind` group.
`app_function`	`FunctionTool`	The app's own server code: the gateway calls it with a short-lived signed token bound to the session, turn and step. One of the `kind` group.
`client`	`ClientTool`	Run by the client: the app executes it and returns the result as an event (`:submitToolResult`). One of the `kind` group.

#McpServer

Field	Type	What it is
`label`	`string`	The label its tools are prefixed with, unique within the agent. Required.
`uri`	`string`	The server's Streamable HTTP endpoint. Required.
`allowed_tools`	`string[]`	Only these of its tools; empty allows every tool it lists.
`credential`	`CredentialBinding`	The credential the gateway presents to the server.

#Skill

Field	Type	What it is
`name`	`string`	The skill's name, unique within the agent. Required.
`description`	`string`	When to use it, shown to the model; at most 1024 characters. Required.
`instructions`	`string`	The instructions it loads, at most 256 KiB. Required.

#ToolPolicy

Field	Type	What it is
`default_decision`	`PolicyDecision`	The decision for a call no rule matches; default allow. One of `allow`, `deny`, `ask`.
`rules`	`ToolPolicyRule[]`	Rules in order; the first match decides. At most 256.
`approval_timeout`	`duration`	How long a call waits for a person's answer before it is denied, 1m to 7d; default 24h.
`egress_allow_hosts`	`string[]`	Hosts every network call of the agent's tools may reach, beyond the tools' own endpoints; `*.example.com` matches subdomains. Private and internal addresses are refused whatever this says.

#AgentBudget

Field	Type	What it is
`max_steps_per_turn`	`int32`	Model and tool steps per turn, 1 to 1000; default 100.
`turn_timeout`	`duration`	One turn's wall-clock deadline, 10s to 24h; default 30m.
`max_session_spend_micros`	`int64`	Spend per session in micro-USD, models and tools together; 0 is the project's spend limit only.

#EnvironmentSpec

Field	Type	What it is
`shape`	`string`	A Sylphx Sandboxes shape; empty gives sessions no environment.
`idle_standby`	`duration`	Put the environment in standby after this long idle, 1m to 24h; default 10m.
`template`	`string`	The Sandboxes image: `template:<name>` or an artifact image by digest, passed unchanged to the lease's `image` field.
`repo`	`RepositorySpec`	The repository to prepare inside the fresh lease, if any.
`egress`	`LeaseNetwork`	The lease's outbound policy, using the Sandboxes network contract.
`budget`	`LeaseBudget`	The lease's CPU and cost ceiling, separate from model and tool spend.
`ttl`	`duration`	The lease's maximum wall time, passed to Sandboxes as `ttl`. The lease is released when the session ends even if this bound has not been reached.

#Errors

UNAUTHENTICATED — No valid key or token was presented.
PERMISSION_DENIED — The key lacks the method's permission.
INVALID_FIELD — A field failed validation.
PAGE_TOKEN_MISMATCH — A page token was reused with different parameters.

Every error arrives in the body Errors describes.

#Examples

curl "https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/agents/agent/agent_versions" \
  -H "Authorization: Bearer $SYLPHX_API_KEY"

Was this page helpful?

Tell us what is missing, wrong, or unclear — this opens a real inbox.

Send feedback

Platform links