arcgis-mcp-bridge

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dissolve_features

Merge adjacent or overlapping features by shared attribute values. Use to generalize boundaries or aggregate parcels, zones, roads.

Instructions

Merge adjacent or overlapping features that share attribute values using ArcPy Dissolve. Use this to generalize boundaries, aggregate parcels, zones, roads, or other features by one or more dissolve fields. Reads in_features and writes a new dissolved output feature class inside PathGuard allowed roots.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`params`	Yes

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed6 schema fields changedv1.0.1Jul 4, 2026

addedInput schema / $defs / DissolveFeaturesInput / description

Added value: +"Input contract for dissolving features by shared attribute values."

addedInput schema / $defs / DissolveFeaturesInput / properties / dissolve_fields / description

Added value: +"Optional field names used to group features before dissolving. Use an empty list to dissolve all input features into one multipart or singlepart output."

addedInput schema / $defs / DissolveFeaturesInput / properties / in_features / description

Added value: +"Absolute path to the existing input feature class, layer, or table. The path must be inside a configured PathGuard allowed root."

addedInput schema / $defs / DissolveFeaturesInput / properties / multi_part / description

Added value: +"When true, allow multipart output features. When false, force singlepart output where ArcPy supports it."

addedInput schema / $defs / DissolveFeaturesInput / properties / out_features / description

Added value: +"Absolute output dataset path to create. The path must be inside a configured PathGuard allowed root; existing outputs require overwrite=true."

addedInput schema / $defs / DissolveFeaturesInput / properties / overwrite / description
```
Added value: +"Set true only when replacing an existing output dataset is intended."
```

First observedv1.0.0Jul 4, 2026

TDQS

A3.5/5.0

Behavior3/5

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

No annotations provided, so description carries full burden. It discloses read/write behavior and path restrictions ('Reads in_features and writes a new dissolved output feature class inside PathGuard allowed roots'). However, it does not detail behavior of fields beyond dissolve_fields, nor error states or performance implications.

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?

Two sentences conveying purpose, use cases, and a key behavioral note. No fluff, but could be slightly more structured (e.g., separate from purpose).

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?

With output schema present, return value explanation is unnecessary. Description covers core operation, usage examples, and path constraints. Missing nuance on multi_part and overwrite, but those are detailed in the well-documented schema.

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?

Input schema has detailed descriptions for each parameter (coverage 0% means description doesn't add schema info, but schema itself is rich). The description reiterates using dissolve fields but adds little beyond schema. Baseline 3 applies due to high schema coverage.

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

Purpose4/5

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

The description clearly states the tool merges adjacent/overlapping features by attribute values using ArcPy Dissolve, with examples ('parcels, zones, roads'). It distinguishes from siblings by naming the specific operation, but doesn't explicitly contrast with merge_features or similar tools.

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?

Provides when to use ('generalize boundaries, aggregate...') but lacks when-not-to-use or alternatives. No explicit exclusion criteria or comparison to sibling tools like merge_features or multipart_to_singlepart.

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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