BrowserMesh

Capture page screenshot

browser_screenshot

Read-onlyIdempotent

Capture a PNG screenshot of a page viewport, full page, or a specific element, optionally within an iframe chain, and receive image bytes directly without file writes.

Instructions

Capture a bounded in-memory PNG screenshot of one explicitly addressed page, either as the viewport/full page or one semantic element optionally reached through a bounded iframe chain. Full-page and element capture use an immutable measured CSS-pixel clip plus encoded-byte validation. BrowserMesh returns image content and does not write to a caller-controlled path or inspect another session.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`pageId`	Yes
`capture`	No
`sessionId`	Yes
`timeoutMs`	No

Output Schema

TableJSON Schema

Name	Required	Description	Default
`bytes`	Yes
`width`	Yes
`height`	Yes
`pageId`	Yes
`mimeType`	Yes
`sessionId`	Yes
`operationId`	Yes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Changed17 schema fields changedv0.2.1Aug 19, 2026

addedInput schema / $defs

Added value: +{
+  "shared0": {
+    "description": "Top document or a bounded outer-to-inner chain of semantic iframe element selectors",
+    "oneOf": [
+      {
+        "properties": {
+          "kind": {
+            "const": "main",
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind"
+        ],
+        "type": "object"
+      },
+      {
+        "properties": {
+          "chain": {
+            "items": {
+              "oneOf": [
+                {
+                  "properties": {
+                    "exact": {
+                      "default": true,
+                      "type": "boolean"
+                    },
+                    "name": {
+                      "type": "string"
+                    },
+                    "strategy": {
+                      "const": "role",
+                      "type": "string"
+                    },
+                    "value": {
+                      "$ref": "#/$defs/shared1"
+                    }
+                  },
+                  "required": [
+                    "strategy",
+                    "value"
+                  ],
+                  "type": "object"
+                },
+                {
+                  "properties": {
+                    "strategy": {
+                      "$ref": "#/$defs/shared2"
+                    },
+                    "value": {
+                      "minLength": 1,
+                      "type": "string"
+                    }
+                  },
+                  "required": [
+                    "strategy",
+                    "value"
+                  ],
+                  "type": "object"
+                }
+              ]
+            },
+            "maxItems": 5,
+            "minItems": 1,
+            "type": "array"
+          },
+          "kind": {
+            "const": "iframe",
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind",
+          "chain"
+        ],
+        "type": "object"
+      }
+    ]
+  },
+  "shared1": {
+    "enum": [
+      "button",
+      "link",
+      "textbox",
+      "checkbox",
+      "radio",
+      "combobox",
+      "heading",
+      "listitem",
+      "option",
+      "tab"
+    ],
+    "type": "string"
+  },
+  "shared2": {
+    "enum": [
+      "text",
+      "label",
+      "placeholder",
+      "testId",
+      "css"
+    ],
+    "type": "string"
+  }
+}

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

changedInput schema / properties / capture / oneOf

Previous value: -[
-  {
-    "properties": {
-      "kind": {
-        "const": "viewport",
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "kind": {
-        "const": "fullPage",
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "kind": {
-        "const": "element",
-        "type": "string"
-      },
-      "locator": {
-        "oneOf": [
-          {
-            "properties": {
-              "exact": {
-                "default": true,
-                "type": "boolean"
-              },
-              "frame": {
-                "description": "Top document or a bounded outer-to-inner chain of semantic iframe element selectors",
-                "oneOf": [
-                  {
-                    "properties": {
-                      "kind": {
-                        "const": "main",
-                        "type": "string"
-                      }
-                    },
-                    "required": [
-                      "kind"
-                    ],
-                    "type": "object"
-                  },
-                  {
-                    "properties": {
-                      "chain": {
-                        "items": {
-                          "oneOf": [
-                            {
-                              "properties": {
-                                "exact": {
-                                  "default": true,
-                                  "type": "boolean"
-                                },
-                                "name": {
-                                  "type": "string"
-                                },
-                                "strategy": {
-                                  "const": "role",
-                                  "type": "string"
-                                },
-                                "value": {
-                                  "enum": [
-                                    "button",
-                                    "link",
-                                    "textbox",
-                                    "checkbox",
-                                    "radio",
-                                    "combobox",
-                                    "heading",
-                                    "listitem",
-                                    "option",
-                                    "tab"
-                                  ],
-                                  "type": "string"
-                                }
-                              },
-                              "required": [
-                                "strategy",
-                                "value"
-                              ],
-                              "type": "object"
-                            },
-                            {
-                              "properties": {
-                                "strategy": {
-                                  "enum": [
-                                    "text",
-                                    "label",
-                                    "placeholder",
-                                    "testId",
-                                    "css"
-                                  ],
-                                  "type": "string"
-                                },
-                                "value": {
-                                  "minLength": 1,
-                                  "type": "string"
-                                }
-                              },
-                              "required": [
-                                "strategy",
-                                "value"
-                              ],
-                              "type": "object"
-                            }
-                          ]
-                        },
-                        "maxItems": 5,
-                        "minItems": 1,
-                        "type": "array"
-                      },
-                      "kind": {
-                        "const": "iframe",
-                        "type": "string"
-                      }
-                    },
-                    "required": [
-                      "kind",
-                      "chain"
-                    ],
-                    "type": "object"
-                  }
-                ]
-              },
-              "name": {
-                "type": "string"
-              },
-              "strategy": {
-                "const": "role",
-                "type": "string"
-              },
-              "value": {
-                "enum": [
-                  "button",
-                  "link",
-                  "textbox",
-                  "checkbox",
-                  "radio",
-                  "combobox",
-                  "heading",
-                  "listitem",
-                  "option",
-                  "tab"
-                ],
-                "type": "string"
-              }
-            },
-            "required": [
-              "strategy",
-              "value"
-            ],
-            "type": "object"
-          },
-          {
-            "properties": {
-              "frame": {
-                "description": "Top document or a bounded outer-to-inner chain of semantic iframe element selectors",
-                "oneOf": [
-                  {
-                    "properties": {
-                      "kind": {
-                        "const": "main",
-                        "type": "string"
-                      }
-                    },
-                    "required": [
-                      "kind"
-                    ],
-                    "type": "object"
-                  },
-                  {
-                    "properties": {
-                      "chain": {
-                        "items": {
-                          "oneOf": [
-                            {
-                              "properties": {
-                                "exact": {
-                                  "default": true,
-                                  "type": "boolean"
-                                },
-                                "name": {
-                                  "type": "string"
-                                },
-                                "strategy": {
-                                  "const": "role",
-                                  "type": "string"
-                                },
-                                "value": {
-                                  "enum": [
-                                    "button",
-                                    "link",
-                                    "textbox",
-                                    "checkbox",
-                                    "radio",
-                                    "combobox",
-                                    "heading",
-                                    "listitem",
-                                    "option",
-                                    "tab"
-                                  ],
-                                  "type": "string"
-                                }
-                              },
-                              "required": [
-                                "strategy",
-                                "value"
-                              ],
-                              "type": "object"
-                            },
-                            {
-                              "properties": {
-                                "strategy": {
-                                  "enum": [
-                                    "text",
-                                    "label",
-                                    "placeholder",
-                                    "testId",
-                                    "css"
-                                  ],
-                                  "type": "string"
-                                },
-                                "value": {
-                                  "minLength": 1,
-                                  "type": "string"
-                                }
-                              },
-                              "required": [
-                                "strategy",
-                                "value"
-                              ],
-                              "type": "object"
-                            }
-                          ]
-                        },
-                        "maxItems": 5,
-                        "minItems": 1,
-                        "type": "array"
-                      },
-                      "kind": {
-                        "const": "iframe",
-                        "type": "string"
-                      }
-                    },
-                    "required": [
-                      "kind",
-                      "chain"
-                    ],
-                    "type": "object"
-                  }
-                ]
-              },
-              "strategy": {
-                "enum": [
-                  "text",
-                  "label",
-                  "placeholder",
-                  "testId",
-                  "css"
-                ],
-                "type": "string"
-              },
-              "value": {
-                "minLength": 1,
-                "type": "string"
-              }
-            },
-            "required": [
-              "strategy",
-              "value"
-            ],
-            "type": "object"
-          }
-        ]
-      }
-    },
-    "required": [
-      "kind",
-      "locator"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "properties": {
+      "kind": {
+        "const": "viewport",
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "fullPage",
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "element",
+        "type": "string"
+      },
+      "locator": {
+        "oneOf": [
+          {
+            "properties": {
+              "exact": {
+                "default": true,
+                "type": "boolean"
+              },
+              "frame": {
+                "$ref": "#/$defs/shared0"
+              },
+              "name": {
+                "type": "string"
+              },
+              "strategy": {
+                "const": "role",
+                "type": "string"
+              },
+              "value": {
+                "$ref": "#/$defs/shared1"
+              }
+            },
+            "required": [
+              "strategy",
+              "value"
+            ],
+            "type": "object"
+          },
+          {
+            "properties": {
+              "frame": {
+                "$ref": "#/$defs/shared0"
+              },
+              "strategy": {
+                "$ref": "#/$defs/shared2"
+              },
+              "value": {
+                "minLength": 1,
+                "type": "string"
+              }
+            },
+            "required": [
+              "strategy",
+              "value"
+            ],
+            "type": "object"
+          }
+        ]
+      }
+    },
+    "required": [
+      "kind",
+      "locator"
+    ],
+    "type": "object"
+  }
+]

addedOutput schema / $defs

Added value: +{
+  "shared0": {
+    "exclusiveMinimum": 0,
+    "maximum": 9007199254740991,
+    "type": "integer"
+  }
+}

changedOutput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

addedOutput schema / properties / bytes / $ref
```
Added value: +"#/$defs/shared0"
```
removedOutput schema / properties / bytes / exclusiveMinimum
```
Removed value: -0
```
removedOutput schema / properties / bytes / maximum
```
Removed value: -9007199254740991
```
removedOutput schema / properties / bytes / type
```
Removed value: -"integer"
```
addedOutput schema / properties / height / $ref
```
Added value: +"#/$defs/shared0"
```
removedOutput schema / properties / height / exclusiveMinimum
```
Removed value: -0
```
removedOutput schema / properties / height / maximum
```
Removed value: -9007199254740991
```
removedOutput schema / properties / height / type
```
Removed value: -"integer"
```
addedOutput schema / properties / width / $ref
```
Added value: +"#/$defs/shared0"
```
removedOutput schema / properties / width / exclusiveMinimum
```
Removed value: -0
```
removedOutput schema / properties / width / maximum
```
Removed value: -9007199254740991
```
removedOutput schema / properties / width / type
```
Removed value: -"integer"
```

Changed2 schema fields changedv0.1.5Aug 14, 2026

addedInput schema / properties / capture

Added value: +{
+  "oneOf": [
+    {
+      "properties": {
+        "kind": {
+          "const": "viewport",
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind"
+      ],
+      "type": "object"
+    },
+    {
+      "properties": {
+        "kind": {
+          "const": "fullPage",
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind"
+      ],
+      "type": "object"
+    },
+    {
+      "properties": {
+        "kind": {
+          "const": "element",
+          "type": "string"
+        },
+        "locator": {
+          "oneOf": [
+            {
+              "properties": {
+                "exact": {
+                  "default": true,
+                  "type": "boolean"
+                },
+                "frame": {
+                  "description": "Top document or a bounded outer-to-inner chain of semantic iframe element selectors",
+                  "oneOf": [
+                    {
+                      "properties": {
+                        "kind": {
+                          "const": "main",
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "kind"
+                      ],
+                      "type": "object"
+                    },
+                    {
+                      "properties": {
+                        "chain": {
+                          "items": {
+                            "oneOf": [
+                              {
+                                "properties": {
+                                  "exact": {
+                                    "default": true,
+                                    "type": "boolean"
+                                  },
+                                  "name": {
+                                    "type": "string"
+                                  },
+                                  "strategy": {
+                                    "const": "role",
+                                    "type": "string"
+                                  },
+                                  "value": {
+                                    "enum": [
+                                      "button",
+                                      "link",
+                                      "textbox",
+                                      "checkbox",
+                                      "radio",
+                                      "combobox",
+                                      "heading",
+                                      "listitem",
+                                      "option",
+                                      "tab"
+                                    ],
+                                    "type": "string"
+                                  }
+                                },
+                                "required": [
+                                  "strategy",
+                                  "value"
+                                ],
+                                "type": "object"
+                              },
+                              {
+                                "properties": {
+                                  "strategy": {
+                                    "enum": [
+                                      "text",
+                                      "label",
+                                      "placeholder",
+                                      "testId",
+                                      "css"
+                                    ],
+                                    "type": "string"
+                                  },
+                                  "value": {
+                                    "minLength": 1,
+                                    "type": "string"
+                                  }
+                                },
+                                "required": [
+                                  "strategy",
+                                  "value"
+                                ],
+                                "type": "object"
+                              }
+                            ]
+                          },
+                          "maxItems": 5,
+                          "minItems": 1,
+                          "type": "array"
+                        },
+                        "kind": {
+                          "const": "iframe",
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "kind",
+                        "chain"
+                      ],
+                      "type": "object"
+                    }
+                  ]
+                },
+                "name": {
+                  "type": "string"
+                },
+                "strategy": {
+                  "const": "role",
+                  "type": "string"
+                },
+                "value": {
+                  "enum": [
+                    "button",
+                    "link",
+                    "textbox",
+                    "checkbox",
+                    "radio",
+                    "combobox",
+                    "heading",
+                    "listitem",
+                    "option",
+                    "tab"
+                  ],
+                  "type": "string"
+                }
+              },
+              "required": [
+                "strategy",
+                "value"
+              ],
+              "type": "object"
+            },
+            {
+              "properties": {
+                "frame": {
+                  "description": "Top document or a bounded outer-to-inner chain of semantic iframe element selectors",
+                  "oneOf": [
+                    {
+                      "properties": {
+                        "kind": {
+                          "const": "main",
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "kind"
+                      ],
+                      "type": "object"
+                    },
+                    {
+                      "properties": {
+                        "chain": {
+                          "items": {
+                            "oneOf": [
+                              {
+                                "properties": {
+                                  "exact": {
+                                    "default": true,
+                                    "type": "boolean"
+                                  },
+                                  "name": {
+                                    "type": "string"
+                                  },
+                                  "strategy": {
+                                    "const": "role",
+                                    "type": "string"
+                                  },
+                                  "value": {
+                                    "enum": [
+                                      "button",
+                                      "link",
+                                      "textbox",
+                                      "checkbox",
+                                      "radio",
+                                      "combobox",
+                                      "heading",
+                                      "listitem",
+                                      "option",
+                                      "tab"
+                                    ],
+                                    "type": "string"
+                                  }
+                                },
+                                "required": [
+                                  "strategy",
+                                  "value"
+                                ],
+                                "type": "object"
+                              },
+                              {
+                                "properties": {
+                                  "strategy": {
+                                    "enum": [
+                                      "text",
+                                      "label",
+                                      "placeholder",
+                                      "testId",
+                                      "css"
+                                    ],
+                                    "type": "string"
+                                  },
+                                  "value": {
+                                    "minLength": 1,
+                                    "type": "string"
+                                  }
+                                },
+                                "required": [
+                                  "strategy",
+                                  "value"
+                                ],
+                                "type": "object"
+                              }
+                            ]
+                          },
+                          "maxItems": 5,
+                          "minItems": 1,
+                          "type": "array"
+                        },
+                        "kind": {
+                          "const": "iframe",
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "kind",
+                        "chain"
+                      ],
+                      "type": "object"
+                    }
+                  ]
+                },
+                "strategy": {
+                  "enum": [
+                    "text",
+                    "label",
+                    "placeholder",
+                    "testId",
+                    "css"
+                  ],
+                  "type": "string"
+                },
+                "value": {
+                  "minLength": 1,
+                  "type": "string"
+                }
+              },
+              "required": [
+                "strategy",
+                "value"
+              ],
+              "type": "object"
+            }
+          ]
+        }
+      },
+      "required": [
+        "kind",
+        "locator"
+      ],
+      "type": "object"
+    }
+  ]
+}

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "bytes": {
+      "exclusiveMinimum": 0,
+      "maximum": 9007199254740991,
+      "type": "integer"
+    },
+    "height": {
+      "exclusiveMinimum": 0,
+      "maximum": 9007199254740991,
+      "type": "integer"
+    },
+    "mimeType": {
+      "const": "image/png",
+      "type": "string"
+    },
+    "operationId": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "pageId": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "sessionId": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "width": {
+      "exclusiveMinimum": 0,
+      "maximum": 9007199254740991,
+      "type": "integer"
+    }
+  },
+  "required": [
+    "operationId",
+    "sessionId",
+    "pageId",
+    "mimeType",
+    "width",
+    "height",
+    "bytes"
+  ],
+  "type": "object"
+}

First observedv0.1.2Aug 12, 2026

TDQS

A4.1/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=true, openWorldHint=true, idempotentHint=true, and destructiveHint=false. The description adds valuable behavioral context by stating the screenshot is bounded in-memory, uses measured CSS-pixel clips, performs encoded-byte validation, and does not write to caller-controlled paths or inspect other sessions. This adds meaning beyond the annotations, justifying a 4.

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?

The description is a single paragraph of about three sentences, front-loaded with the core action and then detailing constraints. It is compact with no filler, but it could be more structured (e.g., bullet points) to separate capture modes. Still, it is efficient and earns a 4.

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

Completeness4/5

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

The tool is moderately complex with several capture modes and iframe support, but the schema and output schema provide substantial detail. The description covers scope, bounds, and safety without needing to explain return values. It misses some edge-case guidance (e.g., what happens on invalid locators), but given the richness of the schema, it is complete enough for an agent to act correctly.

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

Parameters3/5

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

Schema description coverage is 0% according to context, so the description must carry the load. The description mentions 'explicitly addressed page' and 'bounded iframe chain,' which clarifies the frame parameter and element selection, but it does not explain the semantics of sessionId, pageId, or timeoutMs exhaustively. Since the schema itself is rich with enums and descriptions for those fields, the description adds only marginal value, so a baseline 3 is appropriate.

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?

The description clearly states the tool captures a bounded screenshot of a single page or element, with specific modes (viewport, full page, element) and constraints. It distinguishes itself from siblings like observe or snapshot by focusing on image capture, and the description's specificity (e.g., 'bounded in-memory PNG') makes the purpose unmistakable.

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?

The description implies usage by specifying capture modes and options like iframe chains, and states a key limitation: it does not write to caller-controlled paths. It does not explicitly mention alternatives or when not to use it (e.g., for text extraction), but the context is clear enough for an agent to infer appropriate use cases, so it earns a 4 rather than 5.

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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