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OBS MCP

OBS MCP

by Tom-R-Main
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Rust
Hybrid

Set T-Bar Position

obs-set-tbar-position

Set the T-bar position in OBS Studio between 0 and 1, and optionally release it after setting to control transition progress.

Instructions

Set and optionally release the OBS Studio Mode T-Bar position

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": {
      "position": "<position>"
    },
    "name": "obs-set-tbar-position"
  }
}

Input Schema

NameRequiredDescriptionDefault
releaseNoRelease the T-Bar after setting the position
positionYesT-Bar position between 0 and 1

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.1.1

TDQS

A3.5/5.0
Behavior2/5

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

Annotations are all false (readOnlyHint: false, idempotentHint: false, destructiveHint: false), indicating a state-changing operation, but the description adds no behavioral context beyond the verb 'set'. It does not explain side effects, prerequisites (e.g., studio mode requirement), or potential impact on transitions. The 'optionally release' is redundant with the schema parameter description.

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 a single concise sentence that front-loads the core action and resource. No redundant words or filler.

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

Completeness3/5

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

Given the tool's simplicity and full schema coverage, the description is minimal but sufficient for a basic setter. However, it lacks context about when the T-bar is relevant (e.g., studio mode) and what the release behavior means functionally. Since no safety hints are provided by annotations, a bit more behavioral context would be expected, but the current level is adequate for a simple operation.

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%, with both `position` and `release` already documented. The description adds no extra parameter semantics beyond what the schema provides, 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?

The description clearly states the action (set) and the resource (OBS Studio Mode T-Bar position), with an additional nuance of optionally releasing. It distinguishes from sibling tools like obs-trigger-studio-transition, which is about triggering transitions, not setting the T-bar position directly.

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?

The description does not explicitly state when to use this tool versus alternatives. It implies usage in the context of OBS studio mode T-bar control, but lacks explicit guidance on scenarios or exclusions. No mention of when not to use it, such as when not in studio mode.

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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