rent.dev

Create a sandbox

rent_create_sandbox

Starts a Linux sandbox (a Firecracker microVM) and holds its cost from your balance; it is charged by the second while it runs. Waits up to wait_s for placement and answers the sandbox; past that it answers an operation id (op_…) to poll with rent_get_operation, whose response is the sandbox. The sandbox id (lse_…) lives until rent_terminate_sandbox or the timeout (default 300 s). A short balance answers 402 insufficient_balance with a card pay link (valid 24 hours) and an x402 top-up URL. Arguments not listed here go to the REST route as they are, which refuses them by name.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "rent_create_sandbox"
  }
}

Input Schema

Name	Required	Description
`wait_s`	No	Seconds to wait for placement before answering with an operation instead. Default 30; 0 answers the operation at once.
`network`	No	Egress allow and deny lists (CIDR, IP or `*.domain`), and port-URL access.
`profile`	No	Expected duty, used for placement when there is no history.
`routing`	No	Endpoint ids to consider besides own supply (a BYOK endpoint needs your stored credential), to avoid, a cold-start bound, and the partner nodes to consider. By default (`active`) a sandbox may run on a verified partner's machine; `partners: none` keeps it on rent.dev's own machines and your own vendor keys. The operator of a partner machine can read what runs on it. `all` adds nodes on probation.
`env_vars`	No	Environment variables of every command in the sandbox.
`metadata`	No	Your labels. Keys starting `rentdev_` are reserved and dropped.
`template`	No	Template alias: your own or the public set (`base`, `code-interpreter-v1` for rent_run_code). Default `base`.
`timeout_s`	No	Seconds until the sandbox stops (or pauses with auto_pause). Default 300; rent_extend_sandbox moves it, up to 86400.
`auto_pause`	No	Pause instead of stopping at the timeout.
`auto_resume`	No	Resume a paused sandbox when traffic arrives.
`allow_internet_access`	No

Output Schema

Name	Required	Description
`done`	Yes	True: `sandbox` is placed. False: poll `operation_id` with rent_get_operation.
`sandbox`	Yes
`operation`	Yes
`operation_id`	Yes	`op_…`, when placement goes on after the answer. It stays readable once done.

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedNov 12, 2026

changedInput schema / properties / routing / description

Previous value: -"Endpoint ids to consider besides own supply (a BYOK endpoint needs your stored credential), to avoid, and a cold-start bound."New value: +"Endpoint ids to consider besides own supply (a BYOK endpoint needs your stored credential), to avoid, a cold-start bound, and the partner nodes to consider. By default (`active`) a sandbox may run on a verified partner's machine; `partners: none` keeps it on rent.dev's own machines and your own vendor keys. The operator of a partner machine can read what runs on it. `all` adds nodes on probation."

addedInput schema / properties / routing / properties / partners

Added value: +{
+  "enum": [
+    "none",
+    "active",
+    "all"
+  ],
+  "type": "string"
+}

changedOutput schema / properties / operation / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "done": {
-        "type": "boolean"
-      },
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "balance_required_micros": {
-            "maximum": 9007199254740991,
-            "minimum": -9007199254740991,
-            "type": "integer"
-          },
-          "code": {
-            "enum": [
-              "insufficient_balance",
-              "account_frozen",
-              "key_limit_reached",
-              "payment_required",
-              "payment_failed",
-              "unsupported_parameter",
-              "invalid_request",
-              "unauthenticated",
-              "forbidden",
-              "not_found",
-              "method_not_allowed",
-              "conflict",
-              "idempotency_in_flight",
-              "gone",
-              "idempotency_key_reused",
-              "rate_limited",
-              "internal_error",
-              "not_implemented",
-              "vendor_error",
-              "no_capacity",
-              "vendor_timeout",
-              "claim_invalid",
-              "claim_proof_invalid",
-              "checks_failed",
-              "node_exists",
-              "supply_link_unavailable",
-              "node_revoked",
-              "node_suspended",
-              "node_replay",
-              "probe_in_progress",
-              "payout_proof_required",
-              "agent_upgrade_required"
-            ],
-            "type": "string"
-          },
-          "detail": {
-            "type": "string"
-          },
-          "docs_url": {
-            "format": "uri",
-            "type": "string"
-          },
-          "errors": {
-            "items": {
-              "additionalProperties": false,
-              "properties": {
-                "message": {
-                  "type": "string"
-                },
-                "path": {
-                  "type": "string"
-                }
-              },
-              "required": [
-                "path",
-                "message"
-              ],
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "hold_id": {
-            "pattern": "^hold_[0-9A-HJKMNP-TV-Z]{26}$",
-            "type": "string"
-          },
-          "instance": {
-            "type": "string"
-          },
-          "request_id": {
-            "type": "string"
-          },
-          "retry_after": {
-            "maximum": 9007199254740991,
-            "minimum": 0,
-            "type": "integer"
-          },
-          "status": {
-            "maximum": 599,
-            "minimum": 100,
-            "type": "integer"
-          },
-          "title": {
-            "type": "string"
-          },
-          "topup": {
-            "additionalProperties": false,
-            "properties": {
-              "checkout_url": {
-                "format": "uri",
-                "type": "string"
-              },
-              "x402_url": {
-                "format": "uri",
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          "type": {
-            "type": "string"
-          }
-        },
-        "required": [
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-          "title",
-          "status",
-          "code"
-        ],
-        "type": "object"
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-      "metadata": {
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-        "properties": {
-          "create_time": {
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-            "type": "string"
-          },
-          "kind": {
-            "enum": [
-              "create_sandbox",
-              "resume_sandbox",
-              "create_gpu_pod",
-              "settle_x402"
-            ],
-            "type": "string"
-          },
-          "target": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "update_time": {
-            "format": "date-time",
-            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-            "type": "string"
-          }
-        },
-        "required": [
-          "kind",
-          "target",
-          "create_time",
-          "update_time"
-        ],
-        "type": "object"
-      },
-      "name": {
-        "pattern": "^operations\\/op_[0-9A-HJKMNP-TV-Z]{26}$",
-        "type": "string"
-      },
-      "response": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "account_id": {
-                "pattern": "^acc_[0-9A-HJKMNP-TV-Z]{26}$",
-                "type": "string"
-              },
-              "auto_pause": {
-                "type": "boolean"
-              },
-              "auto_resume": {
-                "type": "boolean"
-              },
-              "billed_by": {
-                "enum": [
-                  "rent.dev",
-                  "vendor"
-                ],
-                "type": "string"
-              },
-              "captured_micros": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "cpu_count": {
-                "maximum": 9007199254740991,
-                "minimum": 1,
-                "type": "integer"
-              },
-              "created_at": {
-                "format": "date-time",
-                "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                "type": "string"
-              },
-              "domain": {
-                "type": [
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-                  "null"
-                ]
-              },
-              "ended_at": {
-                "anyOf": [
-                  {
-                    "format": "date-time",
-                    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "endpoint_id": {
-                "type": "string"
-              },
-              "held_micros": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "id": {
-                "pattern": "^lse_[0-9A-HJKMNP-TV-Z]{26}$",
-                "type": "string"
-              },
-              "memory_mb": {
-                "maximum": 9007199254740991,
-                "minimum": 1,
-                "type": "integer"
-              },
-              "metadata": {
-                "additionalProperties": {
-                  "type": "string"
-                },
-                "propertyNames": {
-                  "type": "string"
-                },
-                "type": "object"
-              },
-              "region": {
-                "type": "string"
-              },
-              "sandbox_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "started_at": {
-                "anyOf": [
-                  {
-                    "format": "date-time",
-                    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "state": {
-                "enum": [
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-                  "placing",
-                  "running",
-                  "paused",
-                  "settling",
-                  "terminated",
-                  "failed"
-                ],
-                "type": "string"
-              },
-              "supplier": {
-                "enum": [
-                  "own",
-                  "byok",
-                  "partner"
-                ],
-                "type": "string"
-              },
-              "template": {
-                "type": "string"
-              },
-              "timeout_at": {
-                "anyOf": [
-                  {
-                    "format": "date-time",
-                    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "wire": {
-                "enum": [
-                  "e2b",
-                  "vercel",
-                  "runpod",
-                  "rent"
-                ],
-                "type": "string"
-              }
-            },
-            "required": [
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-              "sandbox_id",
-              "account_id",
-              "state",
-              "template",
-              "cpu_count",
-              "memory_mb",
-              "supplier",
-              "wire",
-              "endpoint_id",
-              "region",
-              "billed_by",
-              "metadata",
-              "auto_pause",
-              "auto_resume",
-              "created_at",
-              "started_at",
-              "timeout_at",
-              "ended_at",
-              "domain",
-              "captured_micros",
-              "held_micros"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "account_id": {
-                "pattern": "^acc_[0-9A-HJKMNP-TV-Z]{26}$",
-                "type": "string"
-              },
-              "billed_by": {
-                "const": "vendor",
-                "type": "string"
-              },
-              "cloud_type": {
-                "enum": [
-                  "SECURE",
-                  "COMMUNITY"
-                ],
-                "type": "string"
-              },
-              "container_disk_gb": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "cost_per_hour_usd": {
-                "anyOf": [
-                  {
-                    "pattern": "^(?:0|[1-9]\\d*)(?:\\.\\d+)?$",
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "created_at": {
-                "format": "date-time",
-                "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                "type": "string"
-              },
-              "credential_id": {
-                "pattern": "^cred_[0-9A-HJKMNP-TV-Z]{26}$",
-                "type": "string"
-              },
-              "ended_at": {
-                "anyOf": [
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-                    "format": "date-time",
-                    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "gpu_count": {
-                "maximum": 9007199254740991,
-                "minimum": 1,
-                "type": "integer"
-              },
-              "gpu_type": {
-                "type": "string"
-              },
-              "id": {
-                "pattern": "^lse_[0-9A-HJKMNP-TV-Z]{26}$",
-                "type": "string"
-              },
-              "image": {
-                "type": "string"
-              },
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-                "type": "string"
-              },
-              "pod_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "ports": {
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-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "started_at": {
-                "anyOf": [
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-                    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                    "type": "string"
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-              },
-              "state": {
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-                  "running",
-                  "paused",
-                  "settling",
-                  "terminated",
-                  "failed"
-                ],
-                "type": "string"
-              },
-              "volume_gb": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              }
-            },
-            "required": [
-              "id",
-              "pod_id",
-              "account_id",
-              "credential_id",
-              "name",
-              "state",
-              "gpu_type",
-              "gpu_count",
-              "image",
-              "cloud_type",
-              "container_disk_gb",
-              "volume_gb",
-              "ports",
-              "cost_per_hour_usd",
-              "billed_by",
-              "created_at",
-              "started_at",
-              "ended_at"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
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-                "pattern": "^acc_[0-9A-HJKMNP-TV-Z]{26}$",
-                "type": "string"
-              },
-              "api_key": {
-                "additionalProperties": false,
-                "properties": {
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-                    "format": "date-time",
-                    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                    "type": "string"
-                  },
-                  "id": {
-                    "pattern": "^key_[0-9A-HJKMNP-TV-Z]{26}$",
-                    "type": "string"
-                  },
-                  "last_used_at": {
-                    "anyOf": [
-                      {
-                        "format": "date-time",
-                        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                        "type": "string"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "name": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "prefix": {
-                    "maxLength": 12,
-                    "minLength": 12,
-                    "type": "string"
-                  },
-                  "revoked_at": {
-                    "anyOf": [
-                      {
-                        "format": "date-time",
-                        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                        "type": "string"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "secret": {
-                    "pattern": "^rent_sk_[0-9a-f]{64}$",
-                    "type": "string"
-                  },
-                  "spend_limit_micros": {
-                    "anyOf": [
-                      {
-                        "maximum": 9007199254740991,
-                        "minimum": 0,
-                        "type": "integer"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "spent_micros": {
-                    "maximum": 9007199254740991,
-                    "minimum": 0,
-                    "type": "integer"
-                  }
-                },
-                "required": [
-                  "id",
-                  "prefix",
-                  "name",
-                  "created_at",
-                  "last_used_at",
-                  "revoked_at",
-                  "spend_limit_micros",
-                  "spent_micros",
-                  "secret"
-                ],
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-                "type": "string"
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-              "payer": {
-                "type": "string"
-              },
-              "topup": {
-                "additionalProperties": false,
-                "properties": {
-                  "account_id": {
-                    "pattern": "^acc_[0-9A-HJKMNP-TV-Z]{26}$",
-                    "type": "string"
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-                  "completed_at": {
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-                        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
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-                    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-                    "type": "string"
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-                    "maximum": 9007199254740991,
-                    "minimum": 0,
-                    "type": "integer"
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-                  "failure_reason": {
-                    "type": [
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-                  "fee_micros": {
-                    "maximum": 9007199254740991,
-                    "minimum": 0,
-                    "type": "integer"
-                  },
-                  "id": {
-                    "pattern": "^top_[0-9A-HJKMNP-TV-Z]{26}$",
-                    "type": "string"
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-                  "kind": {
-                    "enum": [
-                      "checkout",
-                      "auto_recharge",
-                      "x402"
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-                    "type": "string"
-                  },
-                  "rail": {
-                    "enum": [
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-                      "x402"
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-                    "type": "string"
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-                  "ref": {
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-                    "type": "string"
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-                  "tax_micros": {
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-                  "status",
-                  "credit_micros",
-                  "fee_micros",
-                  "tax_micros",
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-                  "failure_reason",
-                  "created_at",
-                  "completed_at"
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-                "type": "object"
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-              "transaction": {
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-    "type": "object"
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-  {
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-]New value: +[
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+    "additionalProperties": false,
+    "properties": {
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+        "type": "boolean"
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+      "error": {
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+              "invalid_request",
+              "unauthenticated",
+              "forbidden",
+              "not_found",
+              "method_not_allowed",
+              "conflict",
+              "idempotency_in_flight",
+              "gone",
+              "idempotency_key_reused",
+              "rate_limited",
+              "internal_error",
+              "not_implemented",
+              "vendor_error",
+              "no_capacity",
+              "vendor_timeout",
+              "claim_invalid",
+              "claim_proof_invalid",
+              "checks_failed",
+              "node_exists",
+              "supply_link_unavailable",
+              "linking_limit",
+              "node_revoked",
+              "node_suspended",
+              "node_replay",
+              "probe_in_progress",
+              "payout_proof_required",
+              "agent_upgrade_required"
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+            "type": "string"
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+          "detail": {
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+            "type": "string"
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+          "errors": {
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+              "properties": {
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+            "type": "integer"
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+            "minimum": 100,
+            "type": "integer"
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+          "title": {
+            "type": "string"
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+          "topup": {
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+                "type": "string"
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+            "type": "string"
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+            "properties": {
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+              "auto_resume": {
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+                "type": "integer"
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+              "cloud_type",
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+                    "type": "string"
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+                    "type": "string"
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+                        "format": "date-time",
+                        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
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+                    "minLength": 12,
+                    "type": "string"
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+                      {
+                        "format": "date-time",
+                        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+                        "type": "string"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "secret": {
+                    "pattern": "^rent_sk_[0-9a-f]{64}$",
+                    "type": "string"
+                  },
+                  "spend_limit_micros": {
+                    "anyOf": [
+                      {
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "spent_micros": {
+                    "maximum": 9007199254740991,
+                    "minimum": 0,
+                    "type": "integer"
+                  }
+                },
+                "required": [
+                  "id",
+                  "prefix",
+                  "name",
+                  "created_at",
+                  "last_used_at",
+                  "revoked_at",
+                  "spend_limit_micros",
+                  "spent_micros",
+                  "secret"
+                ],
+                "type": "object"
+              },
+              "network": {
+                "type": "string"
+              },
+              "payer": {
+                "type": "string"
+              },
+              "topup": {
+                "additionalProperties": false,
+                "properties": {
+                  "account_id": {
+                    "pattern": "^acc_[0-9A-HJKMNP-TV-Z]{26}$",
+                    "type": "string"
+                  },
+                  "completed_at": {
+                    "anyOf": [
+                      {
+                        "format": "date-time",
+                        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+                        "type": "string"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "created_at": {
+                    "format": "date-time",
+                    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+                    "type": "string"
+                  },
+                  "credit_micros": {
+                    "maximum": 9007199254740991,
+                    "minimum": 0,
+                    "type": "integer"
+                  },
+                  "failure_reason": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "fee_micros": {
+                    "maximum": 9007199254740991,
+                    "minimum": 0,
+                    "type": "integer"
+                  },
+                  "id": {
+                    "pattern": "^top_[0-9A-HJKMNP-TV-Z]{26}$",
+                    "type": "string"
+                  },
+                  "kind": {
+                    "enum": [
+                      "checkout",
+                      "auto_recharge",
+                      "x402"
+                    ],
+                    "type": "string"
+                  },
+                  "rail": {
+                    "enum": [
+                      "stripe",
+                      "x402"
+                    ],
+                    "type": "string"
+                  },
+                  "ref": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "status": {
+                    "enum": [
+                      "pending",
+                      "succeeded",
+                      "failed"
+                    ],
+                    "type": "string"
+                  },
+                  "tax_micros": {
+                    "maximum": 9007199254740991,
+                    "minimum": 0,
+                    "type": "integer"
+                  }
+                },
+                "required": [
+                  "id",
+                  "account_id",
+                  "rail",
+                  "kind",
+                  "status",
+                  "credit_micros",
+                  "fee_micros",
+                  "tax_micros",
+                  "ref",
+                  "failure_reason",
+                  "created_at",
+                  "completed_at"
+                ],
+                "type": "object"
+              },
+              "transaction": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "account_id",
+              "topup",
+              "network",
+              "payer",
+              "transaction"
+            ],
+            "type": "object"
+          }
+        ]
+      }
+    },
+    "required": [
+      "name",
+      "metadata",
+      "done"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

First observedNov 12, 2026

TDQS

A4.3/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations only declare the generic write/open-world profile; the description goes well beyond them. It discloses per-second billing with a balance hold, the default 300 s lifetime, the 402 `insufficient_balance` failure shape with a 24-hour card link and x402 top-up URL, and the privacy consequence that a partner machine's operator can read what runs there.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Four dense sentences, front-loaded with the action and its cost consequence before lifecycle and error detail. The parenthetical clauses are information-bearing rather than filler, though the paragraph is packed enough that the balance/error sentence could be split for scannability.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For an 11-parameter, nested-object, non-idempotent creation tool this covers what an agent actually needs: cost model, default and maximum lifetime, the sync-vs-async return contract, and the failure mode with recovery path. With an output schema present it correctly does not spend words describing the returned sandbox's fields.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is already 91%, so most parameter meaning is carried structurally. The description adds one genuinely useful semantic layer the schema cannot: unlisted arguments are forwarded to the REST route and rejected by name, which explains the additionalProperties:{} passthrough. It otherwise restates behavior already documented per-parameter.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a concrete verb and resource — 'Starts a Linux sandbox (a Firecracker microVM)' — which is far more specific than the title 'Create a sandbox'. It does not explicitly name rent_create_gpu_pod as the contrasting alternative, so an agent must infer that this is the CPU/VM path rather than the GPU-pod path.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives explicit routing guidance for the two outcomes: within wait_s it returns the sandbox, past that it returns an `op_…` id to poll with rent_get_operation. It also names rent_terminate_sandbox as the end-of-life action and points to rent_extend_sandbox for timeout changes. It stops short of stating when-not to use this tool versus the GPU-pod or code-execution siblings.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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