nipregon
Server Details
Polish company registry: 4.4M firms, KRS/REGON data, VAT white list checks, financial statements
- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP
- URL
- Repository
- AMR-DEV-PS/nipregon-mcp
- GitHub Stars
- 0
- Server Listing
- nipregon-mcp
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Tool Definition Quality
Average 4.4/5 across 4 of 4 tools scored.
Each tool serves a distinct purpose: VAT verification, company profile, financials, and name search. No overlaps.
All tools follow consistent verb_noun pattern: check_vat_whitelist, get_company, get_financials, search_company.
4 tools is appropriate for a focused domain of Polish company data; neither too few nor too many.
Covers core operations for accessing Polish company info but lacks some advanced features like detailed financial breakdowns or historical data.
Available Tools
7 toolscheck_risk_flagsCheck sanctions and KNF warningsARead-onlyIdempotentInspect
Compliance red-flag check for a Polish company (legal entity) by NIP. USE THIS for KYC/AML or before onboarding a counterparty: returns whether the company appears on Polish or EU sanctions lists (as the sanctioned subject) and whether it has a public warning from the KNF (Polish Financial Supervision Authority). A KNF warning is a notice filed with the prosecutor, not a conviction: apply the presumption of innocence. Legal entities only (sole traders are out of scope). Exact match on NIP/KRS/REGON. Read-only.
| Name | Required | Description | Default |
|---|---|---|---|
| nip | Yes | Polish tax ID (NIP), 10 digits |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, openWorldHint, idempotentHint. Description adds important context about KNF warnings (presumption of innocence) and entity scope, enhancing transparency beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Single, well-front-loaded paragraph with no redundancy. Every sentence adds value (purpose, usage, special behavior).
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Covers purpose, usage, scope, and a key behavioral caveat. Lacks explicit return format, but for a simple boolean check tool with one parameter, this is sufficient; no output schema exists to compensate.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema has 100% coverage with description and pattern for nip. Description mentions NIP but adds no further semantic value beyond the schema, so baseline 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Clearly states the tool performs compliance red-flag checks for Polish legal entities by NIP, returning sanctions and KNF warnings. Distinguishes from siblings like check_vat_whitelist and get_company by focusing on AML/KYC.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly recommends usage for KYC/AML before onboarding, specifies scope (legal entities only) and match type (NIP/KRS/REGON). Does not mention alternatives but context is clear.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
check_vat_whitelistCheck company on the VAT white listARead-onlyIdempotentInspect
Check a Polish company's VAT status in the Ministry of Finance taxpayer register (the 'white list', biała lista KAS) and, optionally, whether a given bank account number is registered to that company. USE THIS before paying an invoice: in Poland, paying over PLN 15,000 to an account outside the white list has tax consequences. Returns VAT status and account-match result. Live query to the official KAS register. Read-only.
| Name | Required | Description | Default |
|---|---|---|---|
| nip | Yes | Polish tax ID (NIP), 10 digits | |
| account | No | Polish bank account number (26 digits), optional |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations (readOnlyHint, idempotentHint, destructiveHint) are consistent with description declaring 'Read-only' and 'Live query to the official KAS register'. Adds context beyond annotations about the live nature and official source.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Description is concise with no redundant information. Front-loads the main action, then provides usage guidance and return summary. Every sentence adds value.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple two-parameter tool with no output schema, description mentions it returns 'VAT status and account-match result', which is sufficient. Covers purpose, usage, and behavior. Slightly vague on exact return format but adequate.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema covers both parameters with descriptions (NIP and account). Description adds that account is optional and clarifies its purpose: checking if a given account number is registered to the company. This adds value beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states it checks a Polish company's VAT status and optionally bank account registration, specifying the official register (Ministry of Finance white list). It distinguishes from sibling tools like check_risk_flags or get_company by focusing on VAT whitelist verification.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly advises using this tool before paying an invoice, explaining the tax consequences of paying over PLN 15,000 to an unregistered account. Does not explicitly exclude other scenarios, but provides clear context.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_companyGet full company profile by NIPARead-onlyIdempotentInspect
Get the full registry profile of a Polish company by its NIP (10-digit tax ID). USE THIS when the user gives a NIP and wants company details, address, board members, or registry status. Returns address, legal form, status, KRS, REGON, PKD activity codes, board members (names from the public KRS register) and VAT status. Data from KRS, REGON and CEIDG public registers. Read-only.
| Name | Required | Description | Default |
|---|---|---|---|
| nip | Yes | Polish tax ID (NIP), 10 digits |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true. The description adds that it is 'Read-only' and specifies data sources (KRS, REGON, CEIDG public registers), which provides useful behavioral context beyond annotations. No contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is four sentences with front-loaded purpose, concise usage guidance, return details, and data source info. Every sentence adds value with no wasted words.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple tool with one parameter and no output schema, the description lists key return fields (address, legal form, status, KRS, REGON, PKD, board members, VAT status). Annotations cover safety and idempotence. The description is complete enough for an AI agent to understand what the tool does and what data it returns.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% with a clear description and pattern for the single parameter 'nip'. The description adds that it is a '10-digit tax ID', but the schema already specifies 'Polish tax ID (NIP), 10 digits' and a pattern. Thus, the description adds minimal new meaning beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states it gets the full registry profile of a Polish company by NIP. It lists specific return fields (address, legal form, status, KRS, REGON, PKD, board members, VAT status) and distinguishes it from sibling tools like search_company that likely search by name.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description explicitly says 'USE THIS when the user gives a NIP and wants company details...', providing a clear when-to-use directive. It doesn't explicitly state when not to use but implies it's not for other queries like checking risk flags or VAT whitelist, which are separate sibling tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_financialsGet company financial statementsARead-onlyIdempotentInspect
Get yearly financial statements of a Polish company by NIP, as filed with the National Court Register (KRS). USE THIS when the user asks about a company's revenue, profit, assets or financial results. Returns per-year revenue, net profit, total assets, equity and liabilities. Data from financial statements (RDF/KRS). Read-only.
| Name | Required | Description | Default |
|---|---|---|---|
| nip | Yes | Polish tax ID (NIP), 10 digits |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, openWorldHint=true, idempotentHint=true, destructiveHint=false. The description adds that the data is from financial statements (RDF/KRS) and specifies the returned fields (revenue, net profit, etc.), providing value beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is two sentences with no wasted words. It front-loads the core purpose and then provides usage guidance and return summary.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (one parameter, clear usage, and return fields described), the description is complete. No output schema exists but the description lists the returned fields.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the schema already describes the nip parameter fully. The description only mentions 'by NIP' without adding format or syntax details, so a baseline score of 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description explicitly states it gets yearly financial statements of a Polish company by NIP from the KRS. It uses specific verbs and resources, and distinguishes from sibling tools by focusing on financial data.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides clear guidance on when to use this tool: 'USE THIS when the user asks about a company's revenue, profit, assets or financial results.' It does not explicitly list exclusions or alternatives, but the context is sufficient.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_leiGet the company LEI codeARead-onlyIdempotentInspect
Get the Legal Entity Identifier (LEI, ISO 17442) of a Polish company (legal entity) by NIP, from the GLEIF register. USE THIS when the user needs a company's LEI for cross-border or financial-market reporting (MiFID, EMIR, payments). Returns the LEI, the registered legal name and the LEI status. Coverage is partial. Legal entities only. Read-only.
| Name | Required | Description | Default |
|---|---|---|---|
| nip | Yes | Polish tax ID (NIP), 10 digits |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnly, openWorld, idempotent, non-destructive. The description adds value by noting 'Coverage is partial' and restricting to legal entities, which are 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.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is concise at three sentences: first for purpose, second for usage guidance, third for outputs and constraints. No redundant or unnecessary information.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (1 param, no output schema), the description covers purpose, usage, return fields, and key constraints (partial coverage, legal entities only). It is complete for effective use.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% for the single parameter nip, with a clear pattern and description. The description only mentions the parameter by name ('by NIP'), adding no deeper semantics. Baseline 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool retrieves the LEI of a Polish company using NIP from the GLEIF register. It is distinct from sibling tools like get_company or get_financials, which handle other company data.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description explicitly states when to use: 'USE THIS when the user needs a company's LEI for cross-border or financial-market reporting (MiFID, EMIR, payments).' It also specifies constraints like 'Legal entities only' and implies alternatives via sibling tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_public_tendersGet public procurement contracts wonARead-onlyIdempotentInspect
Get Polish public-procurement contracts awarded to a company (legal entity) by NIP, as published in the Public Procurement Bulletin (BZP). USE THIS for due diligence or sales intelligence when the user asks what public tenders or government contracts a company has won. Returns up to 25 most recent awards (subject, contracting authority, city, date, value) plus the total count and total value across all awards. Legal entities only. Read-only.
| Name | Required | Description | Default |
|---|---|---|---|
| nip | Yes | Polish tax ID (NIP), 10 digits |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint. Description adds concrete details: returns up to 25 awards, specific fields, total count and value, and entity restriction. No contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Five sentences, each adding unique value: purpose, usage, return structure, constraint, and read-only flag. No redundancy or filler.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Despite no output schema, description fully explains return values and total counts. With one required parameter and clear behavior, description is complete for the task.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% with clear description and pattern for NIP. Description adds 'Legal entities only' context but does not significantly augment what schema provides. Baseline 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Description uses specific verb 'Get' and resource 'public-procurement contracts' for a company, clearly distinguishing from sibling tools like get_company or check_risk_flags.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly states use cases: 'due diligence or sales intelligence when the user asks what public tenders or government contracts a company has won.' Does not explicitly exclude other uses but context is clear.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
search_companySearch Polish companies by nameARead-onlyIdempotentInspect
Search Polish companies by name (fuzzy match). USE THIS when the user asks to find a Polish company, look up a firm by name, or get its NIP/KRS/REGON. Returns NIP, KRS, city, status and a profile URL. Data from the Polish court (KRS) and statistical (REGON) registers. Read-only.
| Name | Required | Description | Default |
|---|---|---|---|
| limit | No | Max results (1-10, default 5) | |
| query | Yes | Company name or part of it |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already flag readOnlyHint, openWorldHint, idempotentHint as true. The description adds valuable behavioral context: 'fuzzy match', returned fields, and data sources. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Four sentences, front-loaded with action and usage. Every sentence adds value—none is wasted. Efficient and clear.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given rich annotations and complete schema, the description covers what the tool does, when to use, returned fields, data sources, and safety. No output schema needed because return fields are listed.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% with clear descriptions for both 'query' and 'limit'. The description adds return field context but does not enhance parameter semantics further. Baseline 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly identifies the verb 'search', the resource 'Polish companies', and specifies 'fuzzy match'. It explicitly states when to use this tool versus siblings like 'get_company' by listing use cases.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The phrase 'USE THIS when the user asks to find a Polish company, look up a firm by name, or get its NIP/KRS/REGON' provides explicit usage guidance. While it does not list when not to use, the positive scenarios effectively distinguish from sibling tools.
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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