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co-eli-mcp

MCP server for the datos.gov.co open-data record of decisions (sentencias) by the Colombian Constitutional Court (Corte Constitucional). Verifies whether a citation exists and returns its metadata.

What this is not

This dataset (v2k4-2t8s, "Sentencias proferidas por la Corte Constitucional") has no full-text field - only metadata: proceso, expediente, magistrado ponente, sala, and date. source_url points to the public relatoria page where the full decision text lives, but this connector does not fetch it.

Related MCP server: CENDOJ Sentencias MCP Server

Tools

Tool

Purpose

co_search_sentencias

Free-text search (e.g. by magistrado name or proceso type)

co_get_sentencia

Exact lookup by citation, e.g. "T-012/92" - verifies it exists

co_coverage

Declare what this connector covers, when each family was captured, and - explicitly - what it does NOT cover. Every gap carries a fallback.

Every response carries lex_uri and source_url (the public corteconstitucional.gov.co relatoria page) and human_readable_citation (the citation itself, e.g. "T-012/92" - already the form used in practice, so no separate identifier scheme is needed here).

Install

pip install co-eli-mcp

Windows 11 with Smart App Control

Smart App Control blocks unsigned executables, which covers uvx.exe, pip.exe and the co-eli-mcp.exe launcher that pip writes at install time. The python.exe and py.exe from the python.org installer are signed by the Python Software Foundation, so running the module through the interpreter works:

python -m pip install co-eli-mcp
python -m co_eli_mcp

pip.exe is blocked for the same reason, so install with python -m pip, not pip install. If python is not on PATH, use the Windows launcher: py -3 -m co_eli_mcp.

{ "mcpServers": { "co-eli-mcp": { "command": "python", "args": ["-m", "co_eli_mcp"] } } }

Do not turn Smart App Control off to work around this - it cannot be re-enabled without reinstalling Windows.

Configuration

Env var

Default

CO_ELI_CACHE_DIR

~/.matematic/cache/co-eli

CO_ELI_AUDIT_DIR

~/.matematic/audit

CO_ELI_BASE_URL

https://www.datos.gov.co/resource/v2k4-2t8s.json

License

Apache-2.0 (code). datos.gov.co data is open data (see SOURCES.md).

Available Tools

3 tools
co_coverageA
Read-onlyIdempotent

Declare what this connector covers, how it is sourced, and what it does NOT cover.

Call this before telling a user that the law "does not contain" something, and whenever a search comes back empty: the absence may be a gap in this connector rather than in the law. Every gap carries a fallback saying where to look instead.

Returns: Coverage with families, an as-of note, and a non-empty list of known gaps.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

Output Schema

ParametersJSON Schema
NameRequiredDescription
statusNo
familiesNo
as_of_noteYesStates what the dates mean, and what they do not promise.
known_gapsNoNever empty. An empty list would mean 'not checked', not 'no gaps'.

TDQS

A4.7/5.0
Behavior4/5

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

Annotations already declare readOnly, openWorld, idempotent, and non-destructive hints. The description adds meaningful behavioral context: absence of results may indicate a coverage gap rather than absence in the law, and each gap has a fallback. This goes beyond the annotations 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 compact, front-loaded with the core purpose, then usage guidance, then return structure. Every sentence adds value, with no redundancy or filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given zero parameters, rich annotations, an output schema, and a description that covers purpose, usage, and return shape (families, as-of note, gaps list), the definition is complete for an agent to select and invoke the tool correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has zero parameters, so schema coverage is 100% trivially and no parameter documentation is required. The description still clarifies what the tool returns, which is more relevant than parameter semantics for this parameterless tool.

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 states a specific verb ('Declare') and resource (what the connector covers), and explicitly distinguishes its scope by noting what it does NOT cover. It is clearly differentiated from sibling search tools like co_search_sentencias and co_get_sentencia.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides explicit when-to-use guidance: call before telling a user the law 'does not contain' something, and whenever a search comes back empty. It also explains the reason (absence may be a gap in the connector) and mentions fallbacks, giving clear context without needing exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

co_get_sentenciaA
Read-onlyIdempotent

Verify a Corte Constitucional citation and fetch its metadata.

ParametersJSON Schema
NameRequiredDescriptionDefault
sentenciaYesexact citation, e.g. ``"T-012/92"``.

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

TDQS

A3.9/5.0
Behavior4/5

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

The annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint. The description adds the 'verify' behavior, implying existence checking, which is beyond the annotations.

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 a single sentence with no wasted words. It is front-loaded with the action and resource, achieving maximum conciseness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple one-parameter tool, full schema coverage, and presence of an output schema, the description is complete. It covers the purpose and the parameter sufficiently for an agent to use it correctly.

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% and the parameter 'sentencia' is described with an example. The description adds no additional meaning beyond the schema.

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's action ('Verify' and 'fetch') and target resource ('Corte Constitucional citation' and 'its metadata'). It distinguishes well from the sibling tool 'co_search_sentencias' which is for searching, while this tool retrieves a specific citation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus the sibling tool 'co_search_sentencias'. The description only states what it does, leaving the agent to infer usage context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

co_search_sentenciasA
Read-onlyIdempotent

Free-text search over Corte Constitucional decision metadata.

ParametersJSON Schema
NameRequiredDescriptionDefault
limitNomax results (default 20).
queryYesfree text (e.g. part of a magistrado's name, or "tutela").

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

TDQS

A4/5.0
Behavior3/5

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

Annotations already provide strong safety guarantees (readOnly, destructiveFalse, idempotent). The description adds minimal extra behavior (search over metadata), but does not mention pagination, result completeness, or query syntax beyond what's in the schema.

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?

Single sentence with no filler, front-loaded with verb and resource, every word earns its place.

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 rich annotations, output schema existence, and simple parameters, the description covers the essential purpose. Could mention query syntax features, but overall complete for a straightforward search tool.

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% with descriptive parameter descriptions. The description does not add significant meaning beyond the schema, so baseline score 3 applies.

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 uses specific verb 'search' with clear resource 'Corte Constitucional decision metadata', distinguishing it from sibling tool 'co_get_sentencia' which likely retrieves a single decision.

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 implies usage for free-text queries against decision metadata. While it doesn't explicitly contrast with the sibling, the sibling's name suggests targeted retrieval, so the intended use is reasonably clear.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. 1 tool updatev0.3.3
    • Addedco_coverage
  2. 2 tool updatesv0.1.0
    • First observedco_get_sentencia
    • First observedco_search_sentencias

TDQS

A4.2/5.0
Disambiguation5/5

Each tool has a clearly distinct purpose: search for finding decisions, get for fetching metadata by citation, and coverage for understanding connector limitations. There is no overlap or ambiguity between them.

Naming Consistency4/5

Two tools follow a clear co_verb_noun pattern (co_search_sentencias, co_get_sentencia), while co_coverage is a noun-only name. This is a minor deviation but the pattern remains readable and predictable.

Tool Count5/5

With only 3 tools, the server is tightly scoped to the task of searching and retrieving Colombian constitutional decisions. Each tool earns its place, and the count feels appropriate for the connector's focused purpose.

Completeness4/5

The core workflows of searching, retrieving, and verifying decisions are covered. The coverage tool explicitly documents gaps and fallbacks, which mitigates potential missing functionality. A minor gap is the lack of a listing or browsing tool, but search handles that sufficiently.

Maintenance

ActivityMaintained
ResponsivenessNo issues

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