frontmcp.dev
The FrontMCP API reference for TypeScript MCP servers, from decorators and contexts to auth, plugins, testing and deployment, checked against the SDK it describes, with a runnable example for…
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 7 · Act 6 · Transact 0 · Score: Not yet scored
Tool inspector
edit_playground
Puts new code in one of the page's Playgrounds, as if the user typed it: the user sees it in the editor, the Playground counts as edited, and its Reset button brings back the original example. It replaces only the files you give, which must be files the Playground has; their earlier code, the user's edits included, is gone. The Playground restarts with the new code; returns the compile errors with file and line, or the error that stopped the server starting, or the new catalog. Time limit: 60 seconds.
Page: /reference
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
index |
integer | yes | The Playground's position on the page, from 1, as list_playgrounds gives it. |
files |
array | yes | The files to replace, by name. |
Raw JSON schema
{
"type": "object",
"properties": {
"index": {
"type": "integer",
"minimum": 1,
"maximum": 9007199254740991,
"description": "The Playground's position on the page, from 1, as list_playgrounds gives it."
},
"files": {
"minItems": 1,
"type": "array",
"items": {
"type": "object",
"properties": {
"name": {
"type": "string",
"description": "The file's name, like \"server.ts\", or \"server.test.ts\" for tests written with @frontmcp/testing."
},
"code": {
"type": "string",
"description": "Its TypeScript."
}
},
"required": [
"name",
"code"
]
},
"description": "The files to replace, by name."
}
},
"required": [
"index",
"files"
],
"$schema": "https://json-schema.org/draft/2020-12/schema"
}
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