Omnara

Update agent config

agents_update

Destructive

Replaces an active agent's config without restarting its conversation and returns the new agent_config. Model, instruction, and tool changes apply at the agent's next model call; machine changes apply immediately, stopping processes on removed machines and deleting the agent's machines from removed pools. Send the complete config, not a patch.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "agentID": "<agentID>",
      "orgID": "<orgID>",
      "projectID": "<projectID>",
      "source": "<source>",
      "source_format": "<source_format>"
    },
    "name": "agents_update"
  }
}

Input Schema

Name	Required	Description
`orgID`	Yes	Organization ID (org_...).
`source`	Yes	Agent config source as YAML or JSON text, or, with source_format json, as a JSON object.
`agentID`	Yes	Agent ID (agt_...).
`projectID`	Yes	Project ID (proj_...).
`source_format`	Yes	Format of source: yaml or json.
`expected_current_config_id`	No	Agent config ID (acfg_...).

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedNov 12, 2026

changedInput schema / $defs / AgentConfigDefinitionGitCredentials / properties / read_only / description

Previous value: -"Prevents pushing, even if the integration allows it."New value: +"Prevents pushing and opening or approving pull requests, even if the integration allows it."

Changed2 schema fields changedOct 29, 2026

removedInput schema / $defs / AgentConfigDefinition / properties / event_webhook
```
Removed value: -{
-  "$ref": "#/$defs/AgentConfigDefinitionEventWebhook"
-}
```

removedInput schema / $defs / AgentConfigDefinitionEventWebhook

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "events": {
-      "items": {
-        "enum": [
-          "agent_input",
-          "model_output",
-          "tool_result",
-          "context_checkpoint",
-          "tool_call_update"
-        ]
-      },
-      "minItems": 1,
-      "type": "array",
-      "uniqueItems": true
-    },
-    "signing_secret_id": {
-      "minLength": 1,
-      "type": "string"
-    },
-    "url": {
-      "minLength": 1,
-      "type": "string"
-    }
-  },
-  "required": [
-    "url",
-    "events"
-  ],
-  "type": "object",
-  "x-go-type": "json.RawMessage"
-}

Changed2 schema fields changedOct 23, 2026

addedInput schema / $defs / AgentConfigDefinitionGitCredentials / properties / read_only

Added value: +{
+  "description": "Prevents pushing, even if the integration allows it.",
+  "type": "boolean"
+}

addedInput schema / $defs / AgentConfigDefinitionGitCredentials / properties / repository_ids

Added value: +{
+  "description": "GitHub repository IDs the credentials can access. Defaults to every repository the installation can access.",
+  "items": {
+    "minimum": 1,
+    "type": "integer"
+  },
+  "maxItems": 500,
+  "minItems": 1,
+  "type": "array",
+  "uniqueItems": true
+}

Changed5 schema fields changedOct 17, 2026
- addedInput schema / properties / agentID / description
```
Added value: +"Agent ID (agt_...)."
```
- addedInput schema / properties / expected_current_config_id / description
```
Added value: +"Agent config ID (acfg_...)."
```
- addedInput schema / properties / orgID / description
```
Added value: +"Organization ID (org_...)."
```
- addedInput schema / properties / projectID / description
```
Added value: +"Project ID (proj_...)."
```
- addedInput schema / properties / source_format / description
```
Added value: +"Format of source: yaml or json."
```
Changed6 schema fields changedOct 15, 2026
- addedInput schema / $defs / AgentConfigDefinitionModel / properties / context_window_tokens / description
```
Added value: +"Context budget for input and output tokens. Triggers compaction when estimated input exceeds the remaining budget after output and safety reserves. The turn fails if compaction cannot make it fit."
```
- addedInput schema / $defs / AgentConfigDefinitionModel / properties / context_window_tokens / maximum
```
Added value: +2147483647
```
- changedInput schema / $defs / AgentConfigDefinitionModel / properties / context_window_tokens / minimum
```
Previous value: -1New value: +2
```
- addedInput schema / $defs / AgentConfigDefinitionSubagentModel / properties / context_window_tokens / description
```
Added value: +"Context budget for input and output tokens. Triggers compaction when estimated input exceeds the remaining budget after output and safety reserves. The turn fails if compaction cannot make it fit."
```
- addedInput schema / $defs / AgentConfigDefinitionSubagentModel / properties / context_window_tokens / maximum
```
Added value: +2147483647
```
- changedInput schema / $defs / AgentConfigDefinitionSubagentModel / properties / context_window_tokens / minimum
```
Previous value: -1New value: +2
```

Changed6 schema fields changedOct 14, 2026

addedInput schema / $defs

Added value: +{
+  "AgentConfigDefinition": {
+    "additionalProperties": false,
+    "description": "An agent config as a JSON object. This schema is the source of truth for agent configs: the server compiles YAML and JSON configs against it.",
+    "properties": {
+      "event_webhook": {
+        "$ref": "#/$defs/AgentConfigDefinitionEventWebhook"
+      },
+      "git_credentials": {
+        "$ref": "#/$defs/AgentConfigDefinitionGitCredentials"
+      },
+      "instruction": {
+        "minLength": 1,
+        "pattern": "\\S",
+        "type": "string"
+      },
+      "interaction_handlers": {
+        "$ref": "#/$defs/AgentConfigDefinitionInteractionHandlers"
+      },
+      "machine_sources": {
+        "$ref": "#/$defs/AgentConfigDefinitionMachineSources"
+      },
+      "max_depth": {
+        "maximum": 8,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "max_subagents": {
+        "maximum": 2147483647,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "mcp": {
+        "$ref": "#/$defs/AgentConfigDefinitionMCPServers"
+      },
+      "memory_stores": {
+        "$ref": "#/$defs/AgentConfigDefinitionMemoryStores"
+      },
+      "model": {
+        "$ref": "#/$defs/AgentConfigDefinitionModel"
+      },
+      "skills": {
+        "$ref": "#/$defs/AgentConfigDefinitionSkills"
+      },
+      "subagents": {
+        "$ref": "#/$defs/AgentConfigDefinitionSubagents"
+      },
+      "tools": {
+        "$ref": "#/$defs/AgentConfigDefinitionTools"
+      },
+      "version": {
+        "enum": [
+          "v1"
+        ]
+      }
+    },
+    "required": [
+      "instruction",
+      "model"
+    ],
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionEventWebhook": {
+    "additionalProperties": false,
+    "properties": {
+      "events": {
+        "items": {
+          "enum": [
+            "agent_input",
+            "model_output",
+            "tool_result",
+            "context_checkpoint",
+            "tool_call_update"
+          ]
+        },
+        "minItems": 1,
+        "type": "array",
+        "uniqueItems": true
+      },
+      "signing_secret_id": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "url": {
+        "minLength": 1,
+        "type": "string"
+      }
+    },
+    "required": [
+      "url",
+      "events"
+    ],
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionGitCredentials": {
+    "additionalProperties": false,
+    "description": "Integration whose git credentials the agent's machines use.",
+    "properties": {
+      "integration": {
+        "pattern": "^[a-zA-Z][a-zA-Z0-9-]{0,31}$",
+        "type": "string"
+      }
+    },
+    "required": [
+      "integration"
+    ],
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionInteractionHandler": {
+    "additionalProperties": false,
+    "description": "Enables an integration's interaction handler. Takes no settings.",
+    "type": "object",
+    "x-go-type": "agentconfig.AgentConfigIntegrationCapabilitySource",
+    "x-go-type-import": {
+      "path": "github.com/omnara-ai/omnara/internal/agentconfig"
+    }
+  },
+  "AgentConfigDefinitionInteractionHandlers": {
+    "anyOf": [
+      {
+        "additionalProperties": {
+          "$ref": "#/$defs/AgentConfigDefinitionInteractionHandler"
+        },
+        "propertyNames": {
+          "pattern": "^[a-zA-Z][a-zA-Z0-9-]{0,31}$",
+          "type": "string"
+        },
+        "type": "object"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "description": "Interaction handlers keyed by integration name.",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionMCPAuth": {
+    "additionalProperties": false,
+    "properties": {
+      "region": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "secret_id": {
+        "minLength": 1,
+        "pattern": "^sec_[a-z2-7]{26}$",
+        "type": "string"
+      },
+      "service": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "type": {
+        "enum": [
+          "bearer",
+          "oauth",
+          "sigv4"
+        ]
+      }
+    },
+    "required": [
+      "type",
+      "secret_id"
+    ],
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionMCPServer": {
+    "additionalProperties": false,
+    "properties": {
+      "auth": {
+        "$ref": "#/$defs/AgentConfigDefinitionMCPAuth"
+      },
+      "default_enabled": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "deferred": {
+        "type": "boolean"
+      },
+      "permission": {
+        "$ref": "#/$defs/AgentConfigDefinitionToolPermission"
+      },
+      "tools": {
+        "additionalProperties": {
+          "$ref": "#/$defs/AgentConfigDefinitionMCPTool"
+        },
+        "propertyNames": {
+          "pattern": "^[a-zA-Z][a-zA-Z0-9_-]{0,63}$",
+          "type": "string"
+        },
+        "type": "object"
+      },
+      "url": {
+        "minLength": 1,
+        "type": "string"
+      }
+    },
+    "required": [
+      "url"
+    ],
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionMCPServers": {
+    "anyOf": [
+      {
+        "additionalProperties": {
+          "$ref": "#/$defs/AgentConfigDefinitionMCPServer"
+        },
+        "propertyNames": {
+          "pattern": "^[a-zA-Z][a-zA-Z0-9-]{0,31}$",
+          "type": "string"
+        },
+        "type": "object"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionMCPTool": {
+    "additionalProperties": false,
+    "properties": {
+      "deferred": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "enabled": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "permission": {
+        "$ref": "#/$defs/AgentConfigDefinitionToolPermission"
+      }
+    },
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionMachineSource": {
+    "additionalProperties": false,
+    "oneOf": [
+      {
+        "required": [
+          "machine_name"
+        ],
+        "type": "object"
+      },
+      {
+        "required": [
+          "machine_pool_name"
+        ],
+        "type": "object"
+      }
+    ],
+    "properties": {
+      "cwd": {
+        "maxLength": 4096,
+        "type": "string"
+      },
+      "delete_after_idle_minutes": {
+        "anyOf": [
+          {
+            "const": 0
+          },
+          {
+            "maximum": 2147483647,
+            "minimum": 5,
+            "type": "integer"
+          }
+        ]
+      },
+      "description": {
+        "maxLength": 4096,
+        "type": "string"
+      },
+      "env_overlay": {
+        "anyOf": [
+          {
+            "additionalProperties": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "propertyNames": {
+              "$ref": "#/$defs/EnvironmentVariableName"
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "initial_num_machines": {
+        "minimum": 0,
+        "type": "integer"
+      },
+      "machine_cpu": {
+        "maximum": 2147483647,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "machine_memory_mb": {
+        "maximum": 2147483647,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "machine_name": {
+        "$ref": "#/$defs/ResourceNameReference"
+      },
+      "machine_pool_name": {
+        "$ref": "#/$defs/ResourceNameReference"
+      },
+      "machine_provider_options_overlay": {
+        "anyOf": [
+          {
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "max_machines": {
+        "minimum": 0,
+        "type": "integer"
+      },
+      "secret_env_overlay": {
+        "anyOf": [
+          {
+            "additionalProperties": {
+              "anyOf": [
+                {
+                  "pattern": "^sec_[a-z2-7]{26}$",
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "propertyNames": {
+              "$ref": "#/$defs/EnvironmentVariableName"
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionMachineSources": {
+    "anyOf": [
+      {
+        "items": {
+          "$ref": "#/$defs/AgentConfigDefinitionMachineSource"
+        },
+        "type": "array"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionMemoryStore": {
+    "additionalProperties": false,
+    "properties": {
+      "access": {
+        "enum": [
+          "read",
+          "read_write"
+        ],
+        "type": "string"
+      },
+      "name": {
+        "$ref": "#/$defs/MemoryStoreName"
+      }
+    },
+    "required": [
+      "name",
+      "access"
+    ],
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionMemoryStores": {
+    "anyOf": [
+      {
+        "items": {
+          "$ref": "#/$defs/AgentConfigDefinitionMemoryStore"
+        },
+        "type": "array"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionModel": {
+    "additionalProperties": false,
+    "properties": {
+      "cache_retention": {
+        "enum": [
+          "none",
+          "short",
+          "long"
+        ]
+      },
+      "context_window_tokens": {
+        "minimum": 1,
+        "type": "integer"
+      },
+      "default_max_output_tokens": {
+        "minimum": 1,
+        "type": "integer"
+      },
+      "name": {
+        "$ref": "#/$defs/ResourceNameReference"
+      },
+      "provider_config": {
+        "$ref": "#/$defs/ResourceNameReference"
+      },
+      "reasoning": {
+        "additionalProperties": false,
+        "properties": {
+          "effort": {
+            "minLength": 1,
+            "pattern": "\\S",
+            "type": "string"
+          }
+        },
+        "required": [
+          "effort"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "provider_config",
+      "name"
+    ],
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionSkills": {
+    "anyOf": [
+      {
+        "items": {
+          "pattern": "^skl_[a-z2-7]{26}$",
+          "type": "string"
+        },
+        "type": "array",
+        "uniqueItems": true
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionSubagent": {
+    "additionalProperties": false,
+    "else": {
+      "not": {
+        "required": [
+          "profile"
+        ],
+        "type": "object"
+      }
+    },
+    "if": {
+      "properties": {
+        "type": {
+          "const": "profile"
+        }
+      },
+      "required": [
+        "type"
+      ],
+      "type": "object"
+    },
+    "properties": {
+      "archive_after_idle_minutes": {
+        "maximum": 2147483647,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "description": {
+        "type": "string"
+      },
+      "instruction": {
+        "$ref": "#/$defs/AgentConfigDefinitionSubagentInstruction"
+      },
+      "max_instances": {
+        "maximum": 2147483647,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "model": {
+        "$ref": "#/$defs/AgentConfigDefinitionSubagentModel"
+      },
+      "profile": {
+        "$ref": "#/$defs/ResourceNameReference"
+      },
+      "type": {
+        "enum": [
+          "profile",
+          "self"
+        ]
+      }
+    },
+    "required": [
+      "type"
+    ],
+    "then": {
+      "required": [
+        "profile"
+      ]
+    },
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionSubagentInstruction": {
+    "additionalProperties": false,
+    "properties": {
+      "append": {
+        "type": "string"
+      }
+    },
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionSubagentModel": {
+    "additionalProperties": false,
+    "dependentRequired": {
+      "name": [
+        "provider_config"
+      ],
+      "provider_config": [
+        "name"
+      ]
+    },
+    "properties": {
+      "cache_retention": {
+        "enum": [
+          "none",
+          "short",
+          "long"
+        ]
+      },
+      "context_window_tokens": {
+        "minimum": 1,
+        "type": "integer"
+      },
+      "default_max_output_tokens": {
+        "minimum": 1,
+        "type": "integer"
+      },
+      "name": {
+        "$ref": "#/$defs/ResourceNameReference"
+      },
+      "provider_config": {
+        "$ref": "#/$defs/ResourceNameReference"
+      },
+      "reasoning": {
+        "additionalProperties": false,
+        "properties": {
+          "effort": {
+            "minLength": 1,
+            "pattern": "\\S",
+            "type": "string"
+          }
+        },
+        "required": [
+          "effort"
+        ],
+        "type": "object"
+      }
+    },
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionSubagents": {
+    "anyOf": [
+      {
+        "additionalProperties": {
+          "$ref": "#/$defs/AgentConfigDefinitionSubagent"
+        },
+        "propertyNames": {
+          "pattern": "^[A-Za-z_][A-Za-z0-9_]{0,63}$",
+          "type": "string"
+        },
+        "type": "object"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionTool": {
+    "additionalProperties": false,
+    "else": {
+      "not": {
+        "anyOf": [
+          {
+            "required": [
+              "description"
+            ],
+            "type": "object"
+          },
+          {
+            "required": [
+              "input_schema"
+            ],
+            "type": "object"
+          }
+        ]
+      }
+    },
+    "if": {
+      "properties": {
+        "type": {
+          "const": "custom"
+        }
+      },
+      "required": [
+        "type"
+      ],
+      "type": "object"
+    },
+    "properties": {
+      "deferred": {
+        "type": "boolean"
+      },
+      "description": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "enabled": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "input_schema": {
+        "$ref": "#/$defs/AgentConfigDefinitionToolInputSchema"
+      },
+      "permission": {
+        "$ref": "#/$defs/AgentConfigDefinitionToolPermission"
+      },
+      "type": {
+        "enum": [
+          "built_in",
+          "custom"
+        ]
+      }
+    },
+    "then": {
+      "required": [
+        "description",
+        "input_schema"
+      ]
+    },
+    "type": "object",
+    "x-go-type": "agentconfig.AgentConfigToolSource",
+    "x-go-type-import": {
+      "path": "github.com/omnara-ai/omnara/internal/agentconfig"
+    }
+  },
+  "AgentConfigDefinitionToolInputSchema": {
+    "additionalProperties": true,
+    "description": "A JSON Schema for the tool's input. Keywords beyond those listed, such as additionalProperties or description, are allowed.",
+    "properties": {
+      "properties": {
+        "additionalProperties": {
+          "type": "object"
+        },
+        "type": "object"
+      },
+      "required": {
+        "items": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "type": {
+        "const": "object"
+      }
+    },
+    "required": [
+      "type"
+    ],
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionToolPermission": {
+    "additionalProperties": false,
+    "properties": {
+      "mode": {
+        "minLength": 1,
+        "pattern": "\\S",
+        "type": "string"
+      },
+      "parameters": {
+        "type": "object"
+      }
+    },
+    "required": [
+      "mode"
+    ],
+    "type": "object",
+    "x-go-type": "json.RawMessage"
+  },
+  "AgentConfigDefinitionTools": {
+    "anyOf": [
+      {
+        "additionalProperties": {
+          "$ref": "#/$defs/AgentConfigDefinitionTool"
+        },
+        "propertyNames": {
+          "allOf": [
+            {
+              "anyOf": [
+                {
+                  "pattern": "^[A-Za-z_][A-Za-z0-9_]{0,63}$",
+                  "type": "string"
+                },
+                {
+                  "maxLength": 64,
+                  "pattern": "^int__[a-zA-Z][a-zA-Z0-9-]{0,31}__[a-zA-Z][a-zA-Z0-9_-]*$",
+                  "type": "string"
+                }
+              ]
+            },
+            {
+              "not": {
+                "pattern": "^mcp__",
+                "type": "string"
+              }
+            }
+          ]
+        },
+        "type": "object"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "x-go-type": "json.RawMessage"
+  },
+  "EnvironmentVariableName": {
+    "minLength": 1,
+    "pattern": "^[^=\\x00]+$",
+    "type": "string"
+  },
+  "MemoryStoreName": {
+    "description": "Machine-readable memory store identifier consisting of lowercase ASCII segments separated by single hyphens.",
+    "maxLength": 64,
+    "minLength": 1,
+    "pattern": "^[a-z0-9]+(?:-[a-z0-9]+)*$",
+    "type": "string"
+  },
+  "ResourceNameReference": {
+    "description": "Name of an existing resource, resolved when the config is compiled.",
+    "maxLength": 64,
+    "minLength": 1,
+    "pattern": "^\\S(?:.*\\S)?$",
+    "type": "string"
+  }
+}

addedInput schema / properties / source / anyOf

Added value: +[
+  {
+    "minLength": 1,
+    "type": "string"
+  },
+  {
+    "$ref": "#/$defs/AgentConfigDefinition"
+  }
+]

addedInput schema / properties / source / description

Added value: +"Agent config source as YAML or JSON text, or, with source_format json, as a JSON object."

removedInput schema / properties / source / minLength
```
Removed value: -1
```
removedInput schema / properties / source / type
```
Removed value: -"string"
```
addedInput schema / properties / source / x-go-type
```
Added value: +"json.RawMessage"
```

First observedOct 13, 2026

TDQS

A4.3/5.0

Behavior4/5

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

Goes well past the annotations by explaining apply timing (model/instruction/tool changes land at the next model call, machine changes apply immediately), the destructive side effects (processes stopped on removed machines, machines deleted from removed pools), and the return value (new agent_config). It does not cover failure modes such as config validation failures or concurrency conflicts on expected_current_config_id, which are left to the schema.

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

Conciseness5/5

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

Three tight sentences, front-loaded with the identity and scope of the operation, then the timing/destructive semantics, then the critical input constraint. No filler and nothing repeated from structured fields.

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 a destructive, high-parameter-count mutation with no output schema, the description covers identity, apply timing, destructive consequences, return value, and input shape. What remains (ID formats, optimistic concurrency) is fully documented in the schema.

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 100%, so the baseline is 3, but the description adds real meaning the schema cannot express: the source field is a wholesale replacement rather than a merge/patch. That single sentence materially changes how an agent constructs the call.

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

Purpose5/5

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

States a specific verb and resource ("Replaces an active agent's config") plus the key differentiator from a relaunch: the conversation is not restarted. The name 'agents_update' is upgraded into a precise, in-place full-replacement operation.

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

Usage Guidelines3/5

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

Gives one concrete usage instruction ("Send the complete config, not a patch") and implies the in-place-edit scenario via "without restarting its conversation". It never names or excludes an alternative (e.g., configs_create or agents_launch), so the agent must infer which tool to pick.

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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