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Set filter

hdhomerun_set_filter

Configure a selected tuner's PID filter with a range or space-separated PID list, controlling which streams the HDHomeRun tuner sends.

Instructions

/tuner<n>/filter set — e.g. 0x0000-0x1FFF or a space-separated PID list.

Input Schema

NameRequiredDescriptionDefault
tunerYes
pid_filterYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.3.6

TDQS

C2.5/5.0
Behavior2/5

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

Annotations already disclose that this is a non-read-only, non-destructive, open-world operation, and the description is consistent with that. But it adds no behavioral context about what state changes, whether the tuner must be stopped, whether the filter persists, or what happens to an active stream.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The single sentence is front-loaded and free of filler, but it is too terse for a mutation tool with two undocumented parameters. Its brevity costs clarity rather than earning concision.

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

Completeness2/5

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

For a mutating tuner-filter operation with no output schema and no parameter descriptions, the definition omits critical call context: the effect of the change, constraints, and expected result. The annotations cover basic safety but not enough for an agent to invoke this confidently.

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 0%, so the description must carry parameter meaning. It usefully shows pid_filter formats such as a hex range or space-separated PID list and implies tuner is the ``<n>`` in the endpoint, but it does not document valid tuner ranges or constraints on the filter string.

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 description names the endpoint and gives example filter values, so it points at setting a tuner filter. However, it never plainly explains what the filter does or how it differs from the sibling get_filter tool, leaving the purpose only partially clear.

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

Usage Guidelines2/5

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

It gives example syntax for pid_filter but no guidance on when to use this tool, when not to use it, or when to prefer hdhomerun_get_filter instead. Prerequisites such as needing an idle or active tuner are also absent.

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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