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Directory / Fiscalisto API docs
Fiscalisto API docs
by fiscalisto.com · https://fiscalisto.com/docs/api/mcp
Docs for Fiscalisto's Mexican e-invoicing API (CFDI 4.0): search, operations, SDK code, errors.
12 of 12 checks · 8 Nov 2026
At a glance
- Runs where
- On their server. What you send to it goes to them.
- What you need
- Nothing: it answered without a login
- Tools
- 9 tools
- Its own safety labels
- 8 read-only, 1 labeled as changing things
- Memory it takes
- About 1,200 tokens of your AI's memory, just for its tool descriptions
- Largest answer
- About 34.9 KB in our test
- Speed
- Average answer in our test: 365 ms
Tokens are an estimate: the characters in its tool names, descriptions and inputs, divided by 4. The exact number depends on your AI model. Safety labels are what the server says about itself. From our latest test, 8 Nov 2026.
Is Fiscalisto API docs MCP server safe?
- None of the hidden-instruction wordings we know were found in its 9 tool descriptions.
- Its error messages showed no secrets or internal details.
- 8 of its 9 tools are labeled read-only; the others may change or send things.
- Overall it scored 82/100 on 8 Nov 2026.
A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.
What this test does not check
- Its source code and packages.
- What a tool quietly does behind the scenes, such as writing a file or calling another service.
- Instructions hidden inside live tool answers. We only look for those in tool descriptions.
- Hidden instructions worded in a way our list doesn't know yet.
- Tools that could change something. Those are read, never run.
What QAmcp can and can't see · How to tell if an MCP server is safe · Hidden instructions · Prompt injection
Known security advisories
It lists no public code, so there is nothing to look up in GitHub Security Advisories or OSV.dev. QAmcp tests how a server behaves. It does not scan source code.
What it can do
9 tools, in the server's own words.
get_startedread-onlyStart here when asked to add Fiscalisto or Mexican invoicing (CFDI 4.0) to an app.
search_docsread-onlyBusca en la documentación de la API de facturación de Fiscalisto (guías y referencia) y devuelve las páginas que más coinciden.
get_pageread-onlyEl texto completo (Markdown) de una página de la documentación, por su ruta, por ejemplo /docs/api/facturas o /docs/api/referencia/facturas/create-invoice.
list_operationsread-onlyLas operaciones de la API (operationId, método, ruta y qué hace), por sección.
describe_operationread-onlyTodo sobre una operación: parámetros, cada campo del cuerpo (tipo, si es obligatorio, límites), ejemplos, el código con el SDK del lenguaje que elija y qué obj…
describe_objectread-onlyLos campos de un objeto que contesta la API (Invoice, Customer, Event, Error…), con su tipo y significado, y un ejemplo.
explain_errorread-onlyQué significa un código de error de la API (el error.code de la respuesta, por ejemplo issuer_required) y cómo resolverlo.
call_apiHace una solicitud real a la API en modo de pruebas con la llave fk_test_ de la persona (nunca una fk_live_) y devuelve el código, el Request-Id y el JSON de l…
list_pagesread-onlyTodas las páginas de la documentación: guías y referencia, con su ruta y de qué tratan.
Test results
Safe mode: only tools labeled read-only were run. How the test works
- !Ready for the newest MCP versionnote
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
- !Every tool is describednote
1 warning
- !call_api: Inputs with no description: method
- !Bad inputs give a clean errornote
2 warnings
- !search_docs: Accepted wrong type for "query" without complaining
- !describe_operation: Accepted wrong type for "operation" without complaining
- and 8 more
- !Fast enoughnote
1 warning
- !search_docs: Slowest tool: search_docs (2.1 s): users will notice the wait
- and 3 more
- !Follows MCP best practices (not scored yet)note
1 tip (not scored)
- !1 tool not labeled read-only doesn't say whether running it twice is safe (idempotentHint): call_api
- ✓ConnectsConnected in 1.8 spass
- ✓Lists its toolsFound 9 toolspass
- ✓Tools are labeled safe or dangerousEvery tool has a safety labelpass
- ✓No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.pass
- ✓Tools work with good inputspass
All good
- ✓get_started: Worked (168 ms)
- ✓search_docs: Worked (2.1 s)
- ✓get_page: Answered with an error, probably because of our sample input: No existe esa página. Use list_pages o search_docs para encontrarla.
- ✓list_operations: Worked (114 ms)
- ✓describe_operation: Worked (204 ms)
- ✓describe_object: Worked (106 ms)
- ✓explain_error: Answered with an error, probably because of our sample input: No es un código de la API. Parecidos: test_mode_only, test_clock_exists, test_clock_missing, test_clock_invalid, test_clock_advancing. Los …
- ✓list_pages: Worked (73 ms)
- and 1 more
- ✓Tools work togetherpass
2 chains working
- ✓search_docs → get_page: get_page found what search_docs returned (path = "/docs/api/pruebas-y-produccion")
- ✓list_pages → get_page: get_page found what list_pages returned (path = "/docs/api")
- ✓No secrets leakedChecked 18 error messages: no secrets or internal detailspass
Test it yourself
Free and open source. Same checks, same score.
npx qamcp-cli https://fiscalisto.com/docs/api/mcpShow this score on GitHub
Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.
[](https://qamcp.dev/s/com-fiscalisto-docs.html)Score over time
- 8 Nov 202682
One test so far. New tests will show here.
Reviews
Coming soon: reviews from people who use Fiscalisto API docs, signed in with GitHub, one per person. Reviews never change the score.
QAmcp Monitor tests it every hour and emails you when it goes down, the score drops, a tool changes or a secret leaks. Free for 1 server, no card.
Have a concern, or want it removed? Ask us and we'll take it off the list. How the directory works