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set_dynamic_param

Hot-update a running ROS node's parameters via dynamic_reconfigure, enabling real-time tuning of PID or other settings without restarting.

Instructions

Hot-update a running node's runtime parameters via dynamic_reconfigure. node: Target ROS node name (REQUIRED, e.g. '/controllers/gimbal_controller'). Accepted aliases: node_name, param_name. params: Dictionary of parameter values to write (e.g. {'p': 10}). Keys like 'yaw/pid/p' map to 'p'. dry_run: If True, inspect available keys and schema without mutating parameters.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nodeNo
paramsNo
dry_runNo
node_nameNo
param_nameNo
confirm_tokenNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions mutation and dry-run behavior, but omits the purpose of confirm_token (present in the schema) and any side effects, error conditions, or reversibility details. The missing confirm_token context is a significant transparency gap for a mutation tool.

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?

The description is compact and information-dense, fitting key parameter explanations into a short paragraph. It could be better structured, but it avoids unnecessary fluff and front-loads the purpose. The aliases are somewhat awkwardly integrated, and confirm_token is absent.

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?

The description covers the primary use case, parameters, and dry-run behavior, and the output schema exists to handle return values. However, the unexplained confirm_token and the node-required inconsistency leave the tool incomplete. For a dynamic_reconfigure tool with six parameters, this is a noticeable gap.

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?

The schema has 0% description coverage, so the description must compensate. It explains node (including aliases node_name and param_name), params (with key mapping example), and dry_run. However, confirm_token is not described at all, and node is marked REQUIRED while the schema says no required parameters, creating potential confusion.

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 tool 'hot-update[s] a running node's runtime parameters via dynamic_reconfigure', using a specific verb and resource. It distinguishes itself from the sibling tool set_param by emphasizing dynamic_reconfigure, and provides a concrete example node name.

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?

The description clearly implies the tool is for dynamic updates and describes the dry_run option for safe inspection. However, it does not explicitly compare with alternative tools like set_param or state when not to use it.

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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