Toolforte

Use this when you need to see exactly which lines changed between two versions of a text. Example prompt: "What changed between these two versions of the contract clause?" Compute an exact line-based diff between two texts with add/remove/unchanged stats. Costs 1 credit. The answer is deterministic.

Use this when you need to check whether JSON is valid or make it readable. Example prompt: "Why does this JSON fail to parse?" Validate and pretty-print JSON with a real parser. Returns formatted JSON or the exact parse error. Costs 1 credit. The answer is deterministic.

Use this when you need CSV data as JSON objects. Example prompt: "Turn this CSV export into JSON." Parse CSV data into JSON with delimiter auto-detection and quoted-field handling. Costs 1 credit. The answer is deterministic.

Use this when you need to know what a regular expression actually matches. Example prompt: "Does this regex match every email address in this text?" Run a JavaScript regular expression against a test string using a real regex engine. Returns all matches with capture groups and indices. Costs 1 credit. The answer is deterministic.

Use this when you need to know whether an IBAN is well formed before using it. Example prompt: "Is NL91ABNA0417164300 a valid IBAN?" Check whether an IBAN is well formed: the mod-97 checksum, the country code, the length that country's IBAN must have, and whether every position holds the kind of character that country allows there (mod-97 turns letters into numbers, so on its own it cannot see a capital O typed in place of a zero). Returns validity, country, and where known the bank identifier printed inside the IBAN. This is a format check, not a bank check: a passing IBAN can still name a bank code that never existed or has since merged away, and says nothing about whether the account exists or can receive a payment. For twelve countries it also verifies the national check digit that the bank computes over the bank code and account number (BE, FR, MC, ES, IT, SM, PT, SI, PL, TN, EE, HU); nationalCheck 'failed' there means the number is very probably invented, since that digit cannot be back-computed the way the mod-97 pair can. Absent nationalCheck means not checked, never approved. For Dutch IBANs it also names the institution behind the four-letter bank code, including codes that no longer issue accounts; an unrecognised code does not make the IBAN invalid. A territory that borrows another country's IBAN (Reunion, Guernsey, Aland and the like) is reported with the prefix it actually uses, since no IBAN starts with RE or GG. Never guess whether an IBAN is well formed: use this tool. Do not present a pass as confirmation that money can be sent. Costs 1 credit. The answer is deterministic.

Use this when you need to add VAT to a net amount or take it out of a gross amount. Example prompt: "What is 21% BTW on 1,250 euros?" Add VAT to a net amount or extract VAT from a gross amount at any rate (e.g. 21 for Dutch BTW). Returns exact net, VAT, and gross amounts rounded to cents. Costs 1 credit. The answer is deterministic.

Use this when you need the dates of the Dutch public holidays in a given year. Example prompt: "When is Ascension Day in the Netherlands in 2027?" Exact Dutch public holidays for a year, including movable feasts (Easter, Ascension, Whitsun) and King's Day rules. Use this instead of computing Dutch holidays yourself. Costs 1 credit. The answer is deterministic.

Use this when you need the number of working days between two dates. Example prompt: "How many working days are there between 1 March and 30 April 2027?" Count working days (Mon-Fri) between two dates inclusive, optionally excluding Dutch public holidays. Exact date math for SLA, payroll, and planning questions. Costs 1 credit. The answer is deterministic.

List the workflows saved to the ToolForte account this API key belongs to. A workflow runs several ToolForte tools in order, passing each one the output of an earlier step, so it does a whole job in one call instead of you orchestrating the steps yourself. Returns each workflow's id, the inputs it expects, the steps it runs and what a run costs. Call this first: workflow_run needs an id from here. Requires an API key, because a workflow belongs to an account. Get a key in one request with POST https://toolforte.com/api/v1/keys/bootstrap and {"email":"[email protected]"}, which emails it to that address, or create one at https://toolforte.com/developers, and send it on the MCP connection as the header Authorization: Bearer tf_...

Describe a job in plain words and get back a workflow built only from tools this server really has: a name, the inputs it needs, and the steps in order, each with one sentence on why it is there. The proposal is honest about gaps: partial is true and missing names what could not be done, and when nothing here fits the answer says so instead of inventing a step. Send save: true to keep it on the account, after which workflow_run can run it by the returned id. Costs 10 credits, the price of one AI generation, charged once per proposal. Requires an API key linked to a ToolForte account. Get a key in one request with POST https://toolforte.com/api/v1/keys/bootstrap and {"email":"[email protected]"}, which emails it to that address, or create one at https://toolforte.com/developers, and send it on the MCP connection as the header Authorization: Bearer tf_...

Run one saved workflow by id and return what every step produced. Get the id and the input keys from workflow_list. Each step costs the credits its own tool costs, normally 1 per step, and the credit for this call counts as the first step's rather than being charged on top. Steps run in order and stop at the first failure; the result says which step stopped it and what was spent up to that point. Check the "substitutions" field when it is present: it lists values a step supplied that the tool replaced with its own, which means the run succeeded on a value you did not send. Requires an API key, because a workflow belongs to an account. Get a key in one request with POST https://toolforte.com/api/v1/keys/bootstrap and {"email":"[email protected]"}, which emails it to that address, or create one at https://toolforte.com/developers, and send it on the MCP connection as the header Authorization: Bearer tf_...

Use this when you need a ToolForte tool that is not in the current tool list. Example prompt: "Is there a tool that converts YAML to JSON?" Find ToolForte tools by what you want done, for example "iban", "vat", "pdf merge", "working days", "csv to json", "screenshot". ToolForte has over a hundred exact tools (validation, conversion, Dutch tax and dates, test data, files, AI); a session lists a small core of them and this is how you reach the rest. Returns the best matches with their arguments and cost. Then call the tool by name, or through run_tool. Free. The answer is deterministic.

The full definition of one ToolForte tool by name: description, argument schema (JSON Schema), output schema, annotations, cost and an example call. Use it after search_tools when the argument summary is not enough. Free.

Run any ToolForte tool by name with its arguments, whether or not it is listed in this session. The result, the cost and the metering are exactly what the tool gives when called directly; run_tool itself is free. Find names with search_tools and schemas with describe_tool.