Agent tools / Structured data
Parse and validate JSON Parse bounded JSON without silently rounding unsafe integers or high-precision decimal literals. Quote exact numeric identifiers or decimals as strings.
Status: implemented. Runtime: browser-or-local. Version: 1.0.0.
Bound bytes, nesting, row count and schema compilation; report loss and numeric precision.
Supported profile This tool accepts the schema below. Its result includes data and versioned runtime metadata. Read warnings in returned data for algorithm coverage and assumptions.
Input schema {
"type": "object",
"properties": {
"text": {
"type": "string",
"maxLength": 200000
}
},
"required": [
"text"
],
"additionalProperties": false
} Output schema {
"$schema": "http://json-schema.org/draft-07/schema#",
"type": "object",
"properties": {
"data": {
"type": "object",
"properties": {
"value": {
"$ref": "#/$defs/json"
}
},
"required": [
"value"
],
"additionalProperties": false,
"maxProperties": 2000
},
"metadata": {
"type": "object",
"properties": {
"tool": {
"const": "json.parse"
},
"version": {
"const": "1.0.0"
},
"runtime": {
"type": "string",
"enum": [
"local",
"browser",
"server"
]
},
"elapsedMs": {
"type": "integer",
"minimum": 0,
"maximum": 9007199254740991
},
"retained": {
"const": false
}
},
"required": [
"tool",
"version",
"runtime",
"retained"
],
"additionalProperties": false,
"maxProperties": 2000
}
},
"required": [
"data",
"metadata"
],
"additionalProperties": false,
"$defs": {
"json": {
"anyOf": [
{
"type": "null"
},
{
"type": "boolean"
},
{
"type": "number"
},
{
"type": "string",
"maxLength": 200000
},
{
"type": "array",
"items": {
"$ref": "#/$defs/json"
},
"maxItems": 2000
},
{
"type": "object",
"maxProperties": 2000,
"additionalProperties": {
"$ref": "#/$defs/json"
}
}
]
}
}
} Example arguments {
"text": "{\"ok\":true}"
} Local MCP tool name: json__parse. Browser and local execution work without a key.
Hosted REST and MCP execution are disabled in this release. Run the example in the browser console below, or use the local MCP server from this repository.
Privacy and limits 256 KiB arguments, 512 KiB output, 20 nesting levels and 2,000 array entries. No input/output logging in this layer. Browser/local utilities do not submit inputs remotely. Optional network operations disclose destination requests. Caller-supplied policies and guardrail findings never grant execution privileges.
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Quote exact numeric identifiers or decimals as strings.
Bound bytes, nesting, row count and schema compilation; report loss and numeric precision.
Contract and limitations
Arguments (JSON) Run locally Cancel Reset example
Result Run a tool to see its structured result. Let a browser agent use this console Enable WebMCP when your browser supports it. Inputs run locally and results remain visible here.
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