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Bannerbear MCP Server

Bannerbear MCP Server

by thenavidm
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

Generate voiceover

generate_voiceover
Destructive

Generates a voiceover from supplied text and a selected voice via Bannerbear V5, requiring confirmation before provider execution.

Instructions

POST /v5/tools/generate_voiceover. Current Bannerbear V5 operation; provider scopes, locks and credits apply. Mandatory confirmation before provider execution; one submission only.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "generate_voiceover"
  }
}

Input Schema

NameRequiredDescriptionDefault
accountNoExact private workspace profile label; no fallback to another profile key.
confirmNoMust be true for this exact requested render, upload, edit, install or delete.
payloadNoComplete current native JSON body. Use payload or payload_file exclusively.
payload_fileNoRegular non-symlink local JSON file, at most 1 MiB.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.0.0

TDQS

B3.4/5.0
Behavior4/5

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

Annotations already carry destructiveHint=true, idempotentHint=false and openWorldHint=true, so the safety profile is covered without the description. The description nonetheless adds genuine context: provider scopes/locks/credits apply, confirmation is mandatory before execution, and only one submission is accepted. These are meaningful operational behaviors beyond the structured fields.

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?

Roughly three short, front-loaded statements with no filler. The endpoint-path sentence is somewhat redundant with the name, but the operational warnings are packed tightly.

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

Completeness4/5

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

For a destructive, non-idempotent, open-world generation tool with no output schema, the description covers the critical preconditions (confirmation, single submission, credit/lock implications). It does not address failure/retry behavior, but the essentials an agent needs to avoid misuse are present.

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 the schema already documents account, confirm, payload/payload_file exclusivity, and the text/voice fields. The description adds no syntax, format, or defaulting detail beyond the schema, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

The first sentence restates the tool as an endpoint path ("POST /v5/tools/generate_voiceover") and adds only metadata ("Current Bannerbear V5 operation"). The verb+resource is inferable from the name, but the description does nothing to distinguish this from siblings like generate_ai_video or generate_ai_image. Purpose is only weakly stated.

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

Usage Guidelines3/5

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

"Mandatory confirmation before provider execution; one submission only" gives real invocation constraints, which is useful. However, there is no guidance on when to choose this tool over the many media-generation siblings (video, image, animation), so usage is only implied.

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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