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nuwainfo

ffl-mcp

Official
by nuwainfo

Fflstopsession

fflStopSession

Stops a running ffl session by its sessionId to end an active session and release related resources.

Instructions

Stop a running ffl session by sessionId.

Input Schema

NameRequiredDescriptionDefault
sessionIdYes

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv0.5.1
    • addedInput schema / additionalProperties
      Added value: +false
  2. First observedv0.2.1

TDQS

C2.7/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden for a mutation tool. It does not disclose whether stopping is idempotent, whether session data/artifacts are discarded, what error occurs for an invalid or inactive sessionId, or whether cancellation is immediate. Only the bare action is conveyed.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single front-loaded sentence with no filler. It is efficient, though the brevity is partly under-specification rather than economy.

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?

An output schema exists, so return values need not be explained, but for a state-changing tool with no annotations and no parameter documentation the description is too thin. Nothing tells an agent the consequences of stopping a session or how failures manifest.

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

Parameters2/5

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

Schema description coverage is 0%, so the schema contributes only the name and type of sessionId. The description repeats that the parameter is a sessionId without adding format, provenance (e.g., obtained from fflListSessions or fflGetSession), or validity constraints, leaving the parameter effectively undocumented.

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?

States a specific verb ('Stop') and resource ('ffl session') plus the identifier used, which is enough to distinguish it from read-oriented siblings like fflGetSession and fflListSessions. It stops short of naming a sibling or describing scope, but the purpose is unambiguous.

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 word 'running' hints at a precondition, but there is no explicit when-to-use guidance, no note about what to do if the session is already stopped or nonexistent, and no routing to alternatives (e.g., fflGetSession to confirm state first). An agent must infer usage entirely.

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