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fabdendev

dagster-mcp

by fabdendev

resolve_asset_selection

Translate Dagster asset-selection syntax into concrete asset keys for materialization or backfill without executing a run. Supports predicates, boolean operators, and traversal.

Instructions

Resolve Dagster asset-selection syntax into concrete assets without launching a run.

Supported syntax:

  • key predicates (key:orders or bare orders) with * wildcards

  • group:, tag:, kind:, and owner: predicates

  • case-insensitive and, or, and not with parentheses

  • roots(...) and sinks(...)

  • upstream/downstream traversal such as +orders, 2+orders, orders+, orders+2, or 1+orders+2

Returns asset_keys as slash-delimited strings ready to pass to materialize_assets or backfill_assets, plus compact GraphQL-shaped asset summaries. This tool is read-only and does not filter external, observable, non-executable, or partitioned matches.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
envNo
asset_selectionYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior4/5

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

With no annotations, description fully discloses behavior: read-only, does not filter external/observable/non-executable/partitioned matches, and returns asset_keys plus summaries. No contradictions.

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?

Description is moderately long but well-structured with clear bullet points listing syntax options. All information is relevant, though some details on output format could be condensed. No fluff.

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?

Given the complexity of syntax resolution and existing output schema, the description covers input syntax, output format, and read-only nature. Missing env parameter documentation slightly reduces completeness, but core functionality is well-described.

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 description must compensate. It thoroughly explains the asset_selection syntax (key predicates, wildcards, operators), but completely omits the env parameter. While the primary parameter is well-covered, ignoring a parameter reduces the score.

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?

Description clearly states the tool resolves asset-selection syntax into concrete assets without launching a run. The verb 'resolve' and specific resource 'asset-selection syntax' distinguish it from sibling tools like list_jobs or get_asset_details.

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?

Description indicates the tool is for resolving selection syntax for use with materialize_assets or backfill_assets, and states it is read-only. Provides clear context but does not explicitly list when not to use or alternatives.

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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