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Plasticity MCP

plasticity_delete_curve_control_points

Destructive

Delete interior B-Spline control points from a Wire in one history step to reshape the curve. Remaining point IDs reindex, so re-read handles afterward.

Instructions

Delete one or more current interior B-Spline control points from a single Wire in one Plasticity history step. References must come from plasticity_list_curve_control_points at the current revision. This changes the curve path and reindexes the remaining control-point IDs, so discard every old handle reference and re-read structure, handles, endpoints, tangents, and functional geometry afterward.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
intentNo
pointsYes
revisionYes

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?

Annotations already flag destructiveHint=true, but the description adds the critical side effects: the curve path changes and remaining control-point IDs are reindexed, so old handles become invalid. It then mandates re-reading structure, handles, endpoints, tangents, and functional geometry, which is exactly the behavioral context needed to avoid stale-reference errors.

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?

Two sentences, front-loaded with the action, then the reference requirement, then the reindexing consequence and recovery steps. No filler; every clause carries operational meaning.

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, no-output-schema tool this is nearly sufficient: the reindexing hazard and required re-reads are covered, which is the main correctness risk. Remaining gaps are the undocumented 'intent' parameter and any error/partial-failure behavior when some points in the set are invalid.

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 0%, so the description must compensate. It clarifies the plural point set, the single-Wire scope, and that revision must be current and references must originate from the list tool. However, the 'intent' field and the nested bodyId/kind/pointId structure are never explained, leaving part of the 3-param surface undocumented.

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 gives a specific verb (Delete), a precise resource (interior B-Spline control points), and scope limits (from a single Wire, in one history step). This clearly separates it from editing siblings such as plasticity_move_curve_control_points and plasticity_slide_curve_control_points.

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?

It states a hard prerequisite and routes the agent to plasticity_list_curve_control_points for valid references at the current revision. It also prescribes post-call behavior (discard old handles, re-read), though it does not contrast the tool against adjacent editing operations beyond the reference source.

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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