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delete_slack_message

Destructive

Permanently delete a Slack message (chat.delete). Only whoever posted it can delete it. This is irreversible — confirm with the user before calling.

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": {
      "channel": "<channel>",
      "ts": "<ts>"
    },
    "name": "delete_slack_message"
  }
}

Input Schema

NameRequiredDescriptionDefault
tsYesTimestamp of the message to delete.
accountNoWorkspace label. Required when several workspaces are connected.
channelYesChannel id (a composite 'channel:ts' external_id is accepted whole).

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.5/5.0
Behavior5/5

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

Annotations declare destructiveHint=true but the description goes further, adding the two facts the annotation can't convey: that the action is irreversible and that it is restricted to the original poster. Auth/permission needs and reversibility status are exactly the behavioral context this dimension rewards.

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 short, front-loaded clauses — action, then constraint, then the safety instruction — with no filler. Each sentence earns its place.

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?

No output schema exists, so return values need not be explained. For a destructive single-target tool the definition covers purpose, permission constraint, irreversibility and the confirmation step — everything needed to invoke it 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%, so channel, ts and account are already documented and the description adds no parameter-level meaning. Baseline 3 applies when the schema carries parameter semantics.

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?

States a specific verb+resource ('Permanently delete a Slack message') and even names the underlying API (chat.delete). The word 'Permanently' implicitly distinguishes it from the sibling trash_message/delete_message_alert tools, so an agent can select it without opening a schema.

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?

Gives clear operating context: 'Only whoever posted it can delete it' establishes a permission precondition, and 'confirm with the user before calling' is explicit when-to-act guidance. It stops short of naming an alternative (e.g. trash_message for recoverable removal), so no explicit exclusion is offered.

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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