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alcastaro

datosgobdo-mcp

by alcastaro

detect_outliers_resource

Read-only

Identify data-entry errors by detecting outliers in numeric columns using the IQR method. Returns rows below Q1-1.5IQR or above Q3+1.5IQR, sorted by distance from median.

Instructions

Find rows where a numeric column falls outside the IQR fence.

Uses the standard IQR method: outliers are values below Q1 - 1.5IQR or above Q3 + 1.5IQR. Returns rows sorted by distance from the median. Useful for detecting data-entry errors in salary, budget, or census data. First call downloads + caches. Subsequent calls reuse the cache.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesDirect URL to the file (CKAN resource 'url' field).
formatYesFormat declared in CKAN. Accepts: csv, tsv, xlsx, json.
columnYesNumeric column to check. One column per call.
filtersNoSame filter syntax as filter_resource. Applied before outlier detection.
limitNoMax outlier rows to return (1–500).

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
errorNo
hintNo
source_urlNo
formatNo
cacheNo
columnNo
methodNo
q1No
q3No
iqrNo
lower_fenceNo
upper_fenceNo
outlier_count_estimateNo
rows_returnedNo
columnsNo
rowsNo
Behavior5/5

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

The description discloses the IQR method, sorting by distance from median, and caching behavior (first call downloads, subsequent calls reuse). Annotations already indicate readOnlyHint and openWorldHint, and the description adds value beyond them without contradiction.

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?

The description is very concise (5 lines) with clear structure: purpose, method, use case, caching. Every sentence adds value.

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 tool's complexity and existing output schema, the description covers caching, ordering, and use cases. It could mention handling of missing values or non-numeric columns, but overall it is informative enough.

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 100%, so baseline is 3. The description does not add significant meaning beyond the schema for parameters; it only provides context on the method and output ordering.

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 it finds rows where a numeric column falls outside the IQR fence, specifies the method, and gives concrete use cases (salary, budget, census data). It distinguishes from sibling tools by focusing on outlier detection via IQR.

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 provides clear context (detecting data-entry errors) and mentions caching behavior. However, it does not explicitly state when not to use this tool or provide direct comparisons to siblings like quantiles_resource or filter_resource.

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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