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Postman MCP Server

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TypeScript
Hybrid

Replace an environment's data

putEnvironment
Idempotent

Replace all data in a Postman environment by providing its ID and new environment details. This overwrites existing variables and settings.

Instructions

Replaces all the contents of an environment with the given information.

Note:

  • The request body size cannot exceed the maximum allowed size of 30MB.

  • If you receive an HTTP `411 Length Required` error response, manually pass the `Content-Length` header and its value in the request header.

  • Only shared variable values can be modified through the Postman API. A shared variable is an environment variable with its value synced and stored in the Postman cloud, and can be accessed by your teammates in the environment's workspace.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
environmentNoInformation about the environment.
environmentIdYesThe environment's ID.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.12.3

TDQS

B3.4/5.0
Behavior1/5

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

The description adds useful operational details such as the 30MB request limit, the 411 Content-Length workaround, and the shared-variable limitation. However, it contradicts the annotations: destructiveHint is false while 'Replaces all the contents' describes a destructive overwrite of existing environment data.

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 concise and well-structured: one purpose sentence followed by three focused note bullets. Each bullet adds operational value, and there is no redundant or filler text.

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?

For a write tool with no output schema, the description covers replacement semantics, body size limits, error handling, and the shared-variable API constraint. It lacks explicit return-value information and prerequisites, but the rich schema and annotations compensate for most gaps.

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?

The input schema has 100% schema_description_coverage and rich descriptions for every parameter and nested property. The description adds no additional parameter-level meaning, so the baseline of 3 applies.

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 first sentence uses the specific verb 'Replaces' with the resource 'environment' and scope 'all the contents', making the operation unmistakable. It clearly distinguishes this from sibling tools like createEnvironment or getEnvironment.

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

Usage Guidelines3/5

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

The description implies usage for overwriting an existing environment's data, but it does not explicitly state when to use this tool versus createEnvironment or any other alternative. No exclusions or preferred conditions are given.

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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