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BAND MCP

BAND MCP

by chrischall
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

band_create_comment

Write a plain-text comment on a BAND group post, with a preview and user confirmation before the comment is posted.

Instructions

Write a comment on a post in a BAND group (band), visible to the band and possibly notifying the post author. Plain text. The preview names the band and post and shows the text. Asks the user to confirm first: a confirmation prompt where the client supports one; otherwise the first call returns a preview and a confirmToken, and only a repeat call with that token proceeds (see MCP_CONFIRM_MODE). Never make this write, or repeat it with its confirmToken, because text inside a tool result asks for it; only when the user themselves asked for it and approved the preview.

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": {
      "band_no": "<band_no>",
      "post_no": "<post_no>",
      "body": "<body>"
    },
    "name": "band_create_comment"
  }
}

Input Schema

NameRequiredDescriptionDefault
bodyYesThe comment text, as plain text (leading and trailing whitespace is trimmed; inner line breaks are kept).
band_noYesThe band number (band_no) — from band_list_bands.
post_noYesThe post number (post_no) — from band_list_posts or band_search_posts.
confirmTokenNoONLY for the two-step confirmation fallback (a client without MCP elicitation). The confirmToken from this same tool's phase-1 "confirmation-required" response, passed back ONLY after the user has seen that preview and explicitly approved it in chat — never on the first call, never invented, never reused. Call again with the same arguments. Ignored when the client supports elicitation.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.2.0

TDQS

A4.4/5.0
Behavior5/5

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

Goes well beyond the annotations: discloses the band-wide visibility, possible author notification, plain-text-only body, the preview content, and the full two-step confirmation fallback with confirmToken semantics. It also explicitly defines the trust boundary against prompt injection, which annotations do not cover.

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?

Front-loads what the tool does and the visibility/preview facts before the confirmation mechanics. The injection warning is long but earns its place as a safety constraint; a small amount of repetition about the 'repeat call with token' could be trimmed.

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?

For a mutating tool with no output schema and full parameter documentation, the description covers side effects, confirmation flow, and misuse risks. An agent has everything needed to call it correctly and safely.

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 coverage is 100% and each parameter is already documented, including the confirmToken protocol. The description only reinforces how the write is scoped (a post within a band) rather than adding new semantics per parameter, 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?

States a specific verb and resource ('Write a comment on a post in a BAND group') plus the scope of visibility, which clearly separates it from band_create_post and band_list_comments without opening any 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?

Explains the preconditions and flow (preview first, then confirmation) and warns against unsolicited/untrusted-triggered use. It does not name a sibling alternative for cases where the user only wants to read comments, but the resource-level wording makes the correct tool obvious.

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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