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aws_session_set

Idempotent

Set the default AWS profile or region for this MCP session so subsequent AWS tool calls use them unless explicitly overridden. Pass only changed values to switch accounts or regions.

Instructions

Set the default AWS profile and/or region for the rest of this MCP session. Subsequent calls to aws_whoami, aws_login_*, and other AWS tools will use these values unless they override explicitly. Use when the user says 'switch to prod', 'use us-west-2', 'look at the staging account', etc. Both params are optional; pass whichever changed. Returns the resulting session state.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
regionNoAWS region to use as default (e.g. 'us-west-2'). Omit to leave unchanged.
profileNoAWS profile name to use as default. Omit to leave unchanged.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.3.2

TDQS

A4.5/5.0
Behavior4/5

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

Annotations indicate idempotentHint=true, and description adds that it returns resulting session state and both params are optional, providing useful behavioral context beyond annotations.

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?

Three sentences with no redundancy, front-loaded with purpose, efficient and clear.

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

Completeness5/5

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

Covers purpose, usage, behavior, return value, and optionality of parameters. Complete for a simple configuration tool with no output schema.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with descriptions; description adds that parameters are optional and can be used individually, enhancing meaning.

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 description clearly states it sets the default AWS profile and/or region for the session, distinguishing it from siblings like aws_session_clear and aws_session_get.

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

Usage Guidelines4/5

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

Provides explicit examples of when to use (e.g., 'switch to prod') and explains effect on subsequent tools. Lacks explicit 'do not use' scenarios but sufficient for context.

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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