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pool_member_disable

Destructive

Disable a pool member with graceful drain: existing connections complete while new traffic stops. Use for maintenance or rolling deployments; requires confirmed=true to apply, otherwise preview only.

Instructions

[WRITE] Disable a pool member with graceful drain — existing connections complete, no new traffic.

Returns a one-line result. Use for maintenance or rolling deployments; run pool_members first for the server IP, pool_member_enable to reverse it.

SAFETY: requires confirmed=True; without it you get a preview only.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
poolYesExact pool name as shown by pool_list — matched literally, not fuzzily, and an unknown name is refused rather than ignored. Pools are often named differently from the Virtual Services that use them, so do not infer it from a VS name.
serverYesServer IP address.
confirmedNofalse (the default) returns a preview naming the member and pool, and changes nothing; true disables the member, draining it so existing connections finish while new traffic stops. Reverse it with pool_member_enable.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. Addedv1.8.14
  2. Removedv1.8.8
  3. Addedv1.5.29
  4. Removedv1.5.28
  5. First observedv1.5.22

TDQS

A4.7/5.0
Behavior5/5

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

Beyond the annotations (destructiveHint=true, readOnlyHint=false), the description discloses the graceful drain behavior, the one-line return result, and the safe preview mode when confirmed is not true. It clearly explains the destructive action and its confirmation requirement without contradicting 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?

The description is compact and front-loaded: purpose and effect first, then usage guidance, then safety. Every sentence adds distinct value, with no filler or redundancy.

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?

The description covers the action's purpose, usage context, prerequisites, reversal command, return style, and safety confirmation. With an output schema and complete parameter schema present, no essential information is missing for the agent to call this tool correctly.

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% and each parameter already has detailed semantics, including confirmed's preview vs. actual disable behavior. The description adds little parameter-level detail beyond reinforcing the confirmed=True safety requirement, which is already present in the schema.

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 states a specific verb and resource: 'Disable a pool member with graceful drain' and immediately explains the behavioral effect: existing connections complete, no new traffic. It clearly distinguishes from the sibling pool_member_enable by noting it reverses the action.

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

Usage Guidelines5/5

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

The description gives explicit usage context: 'Use for maintenance or rolling deployments' and instructs the agent to 'run pool_members first for the server IP' and use 'pool_member_enable to reverse it.' This tells the agent both when to use the tool and what to do before/after.

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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