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search_case_by_signature

Read-only

Verify a cited case signature (sygnatura), e.g. "II CSK 448/14".

    Use before relying on a judgment cited by a user or another agent.
    Answers from a local index of all SAOS judgments first; only on a
    local miss does it query live SAOS. Read the verdict field:
    "confirmed" (matches listed with saos_id, court, date, type —
    different courts reuse signatures, so check the court), "not_found"
    (strong evidence the citation is fabricated or wrong),
    "outside_coverage" (administrative courts NSA/WSA are not in SAOS —
    verify in CBOSA instead), "unverified" (local miss and SAOS
    unreachable; do not treat as nonexistent). Optional court_type:
    COMMON, SUPREME, CONSTITUTIONAL_TRIBUNAL, NATIONAL_APPEAL_CHAMBER.
    has_text=false on a match means SAOS stores no text for it, so
    verify_quote cannot check quotes against that judgment.
    

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNo
signatureYes
court_typeNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.8/5.0
Behavior5/5

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

Goes well beyond the readOnly/openWorld annotations: discloses the local-index-first-then-live-SAXS lookup order, the exact verdict semantics (confirmed/not_found/outside_coverage/unverified) with interpretation guidance, the warning that courts reuse signatures, and the has_text implication for verify_quote.

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?

Front-loads the core purpose and the example, and every block of text carries actionable content. It is dense and slightly list-like, but no sentence is 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?

An output schema exists, yet the description still pre-empts the most decision-critical return field (verdict), which is exactly what an agent needs to interpret results and route to alternatives like CBOSA or verify_quote.

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?

Schema coverage is 0%, so the description must compensate; it supplies an example signature format and enumerates the court_type values (COMMON, SUPREME, CONSTITUTIONAL_TRIBUNAL, NATIONAL_APPEAL_CHAMBER) that the schema only types as a bare string. The 'limit' parameter remains unexplained, so it is not fully compensating.

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?

States a specific verb+resource ('Verify a cited case signature') with a concrete example, and its verification role is clearly distinct from siblings like get_case, research_cases, and verify_quote.

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?

Explicitly says when to use it ('before relying on a judgment cited by a user or another agent') and gives a when-not/alternative route ('administrative courts NSA/WSA are not in SAOS — verify in CBOSA instead').

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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