Replit MCP Server

create_repl

Create a new programming workspace with specified title and language, optionally adding descriptions and setting privacy.

Instructions

Create a new repl

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": {
      "title": "<title>",
      "language": "<language>"
    },
    "name": "create_repl"
  }
}

Input Schema

Name	Required	Description
`title`	Yes	Title of the new repl
`language`	Yes	Programming language/template for the repl (e.g., python3, nodejs, html)
`description`	No	Optional description for the repl
`isPrivate`	No	Whether the repl should be private (default: false)

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Jan 10, 2026

TDQS

C2.9/5.0

Behavior2/5

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

No annotations are provided, so the description carries full burden. 'Create a new repl' implies a write/mutation operation, but the description doesn't disclose any behavioral traits: it doesn't mention authentication requirements, rate limits, what happens on success/failure, whether the repl becomes active automatically, or any side effects. This is a significant gap for a creation tool with zero annotation coverage.

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?

The description is a single, efficient sentence with zero wasted words. It's front-loaded with the core action ('Create a new repl'), making it immediately scannable. Every word earns its place, though this conciseness comes at the cost of completeness.

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

Completeness2/5

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

Given this is a creation tool with no annotations, no output schema, and 4 parameters, the description is incomplete. It doesn't explain what a 'repl' is (contextually important given siblings like 'run_repl'), doesn't cover behavioral aspects like authentication or side effects, and provides no usage guidance. The agent lacks critical context to use this tool effectively.

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 100%, so the schema fully documents all four parameters (title, language, description, isPrivate). The description adds no parameter information beyond what the schema provides—it doesn't explain what a 'repl' is, give examples beyond the schema's language examples, or clarify parameter interactions. Baseline 3 is appropriate when the schema does all the work.

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

Purpose4/5

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

The description clearly states the verb ('Create') and resource ('a new repl'), making the purpose immediately understandable. It distinguishes from siblings like 'fork_repl' (which copies) or 'list_repls' (which reads), but doesn't explicitly differentiate from other creation tools like 'create_file' or 'create_deployment' beyond the resource name.

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

Usage Guidelines2/5

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

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., authentication), when to choose 'create_repl' over 'fork_repl', or any context about the repl platform. The agent must infer usage from the tool name alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.