traces.ribdsp.com
A session replay player an AI agent can interrogate through WebMCP: bisect the timeline, read the DOM at any moment, and file a verifiable bug report.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 9 · Act 7 · Transact 1 · Score: Not yet scored
Tool inspector
bisect
Find the first moment in the recording when a condition became true about an element, using a binary search over the replay timeline. Use this instead of reading the DOM at many timestamps: it takes about ten replays instead of dozens, and it returns a millisecond, not a guess. Typical use: locating exactly when a button became disabled, when a dropdown lost its options, or when an error message first appeared. The condition is assumed to change once and stay changed. Call read_session_meta first to learn the recording duration.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
selector |
string | yes | CSS selector for the element to watch, e.g. "#checkout button[type=submit]". Use find_element first if you are not sure it exists. |
predicate |
object | yes | The condition to search for. A structured object from a fixed set — expressions and code are not accepted. |
from |
number | yes | Start of the search window, in ms from the beginning of the recording. |
to |
number | yes | End of the search window, in ms. Usually durationMs from read_session_meta. |
precisionMs |
number | no | How close the answer needs to be, in ms. Defaults to 250. Larger is faster. |
Raw JSON schema
{
"type": "object",
"properties": {
"selector": {
"type": "string",
"description": "CSS selector for the element to watch, e.g. \"#checkout button[type=submit]\". Use find_element first if you are not sure it exists."
},
"predicate": {
"type": "object",
"description": "The condition to search for. A structured object from a fixed set — expressions and code are not accepted.",
"properties": {
"kind": {
"type": "string",
"enum": [
"propertyEquals",
"attributeExists",
"attributeEquals",
"optionCount",
"visible",
"textContains",
"exists"
],
"description": "propertyEquals: a live DOM property. attributeExists / attributeEquals: an attribute. optionCount: number of <option> children, use 0 to find an empty dropdown. visible: rendered and non-zero-sized. textContains: substring of the text content. exists: the element is in the document."
},
"property": {
"type": "string",
"enum": [
"disabled",
"checked",
"readOnly",
"value"
],
"description": "For propertyEquals only."
},
"attribute": {
"type": "string",
"description": "For attributeExists and attributeEquals. Letters and hyphens, up to 30 characters."
},
"text": {
"type": "string",
"description": "For textContains. Up to 100 characters, matched case-insensitively."
},
"equals": {
"description": "The value to compare against: boolean for visible and exists, integer for optionCount, string or boolean for propertyEquals, string for attributeEquals."
}
},
"required": [
"kind"
]
},
"from": {
"type": "number",
"description": "Start of the search window, in ms from the beginning of the recording."
},
"to": {
"type": "number",
"description": "End of the search window, in ms. Usually durationMs from read_session_meta."
},
"precisionMs": {
"type": "number",
"description": "How close the answer needs to be, in ms. Defaults to 250. Larger is faster."
}
},
"required": [
"selector",
"predicate",
"from",
"to"
],
"additionalProperties": false
}
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