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FormulaSignal MCP Server

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answering

FormulaSignal is answering right now. Last checked 1 min ago. It exposes 18 tools.

Dated formula history, confirmed changes and evidence for U.S. pre-workout supplements.

Uptime history 58 days of history · worst day 91%
58 days agonow
100.0%
Uptime 24h
92 of 92 checks
18
Tools
read from the server
904 ms
Response time
average over 24h
open, no key
Access
streamable-http

What changed 38

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 15 September 2026. No other catalogue keeps this.

27 Sep 18 tools appeared ingredients.regulatory, ingredients.research, ledger.get and 15 more
27 Sep 18 tools disappeared formulasignal_compare_products, formulasignal_explain_signal, formulasignal_get_category_snapshot and 15 more
27 Sep a tool changed version
15 Sep a tool description was rewritten formulasignal_watch_product

Tools have disappeared from this server

A tool that vanishes takes a piece of your agent with it, and the change arrives silently. Watch this server and every such change lands in your inbox.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

run in your terminal
claude mcp add record --transport http https://formulasignal.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://formulasignal.com/mcp
~/.codex/config.toml
[mcp_servers.record]
url = "https://formulasignal.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "record": {
      "url": "https://formulasignal.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "record": {
      "type": "http",
      "url": "https://formulasignal.com/mcp"
    }
  }
}

Available tools 18

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

products
products.compare
Compare two or three covered products on consistent FormulaSignal criteria. When to use: Use when a user asks how covered products differ on formula, serving economics, stimulant load, or record depth. What it cannot provide: It returns no overall winner and no suitability judgement. A product whose depth is REGISTERED is refused rather than compared, because a guessed label beside a measured one implies a precision the Record does not have. Limits: At most 3 products per call, and every product must be at NORMALIZED depth. Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
products.get
Return the controlled current Record for one covered product: identity, serving configuration, declared ingredients, captured price context, and freshness. When to use: Use when you need what a product declares right now, with the dates and limitations attached. What it cannot provide: It returns no preserved source bytes, no internal capture identifiers, no review notes, and no verdict about whether the product is good or suitable. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
products.history
Return the controlled historical timeline for one covered product, with each state classified by what it can actually support. When to use: Use to find out whether a product has changed, how deep the recoverable history is, and which states are comparable to each other. What it cannot provide: It never presents an observation window as an exact reformulation date, and it never reports an unreviewed candidate as a confirmed change. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
products.resolve
Resolve a brand, product name, or alias to one canonical covered product. When to use: Call this first whenever you hold a user-supplied product name and need the canonical product_id every other capability takes. What it cannot provide: It never guesses. An ambiguous or generic name returns the candidate list and no match, and an uncovered product returns no match at all. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
products.serving_economics
Return the captured commercial facts and the deterministic price arithmetic for one covered product. When to use: Use for package price, price basis, serving count, price per serving, and the date each was observed. What it cannot provide: It never calls an observed price a list price unless the Record recorded it as one, and it never reports a promotional-versus-list difference as a price change. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
watchlist
watchlist.add
Add one covered product to the bound account's watchlist. When to use: Use when a person asks to start watching a product. Resolve the product first if you were given a name rather than an id. What it cannot provide: It cannot add a product outside the covered set, exceed the account's watch limit, or act on an account this key is not bound to. It refuses a covered product FormulaSignal cannot monitor yet and says why in the refusal. It does not start a subscription and refuses when the account is not entitled. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
watchlist.list
Return the watchlist of the one Founding Pro account this key is bound to, with each product's monitoring state. When to use: Use to answer what a person is watching, when each product was last read, when the next check is due, and whether anything is currently unreadable. What it cannot provide: It reaches exactly one account, the one bound to this key, and no other. It returns no candidate detail, no source URL and no internal identifier, and it is not a way to read the covered set. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
watchlist.receipt
Return the monitoring receipt for one period: valid checks, attempts that returned nothing, recoveries, and confirmed Signals. When to use: Use to answer whether anything a person watches changed in a period, and what monitoring did in the period whether or not anything did. What it cannot provide: A count of valid checks is not a claim that a product held still. It reports no candidate, no source URL and no internal identifier, and a period the monitoring ledger does not reach is reported as partly covered rather than as zero. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
watchlist.remove
Remove one product from the bound account's watchlist. When to use: Use when a person asks to stop watching a product. Future alerts stop; everything already delivered stays. What it cannot provide: It cannot delete an account, cancel a subscription, or remove history. Removing a watch never removes what was already sent. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
signals
signals.explain
Explain one approved FormulaSignal Signal: a confirmed, reviewed change between two comparable product states. When to use: Use when a product record or history response named a signal_id and you need the before state, the after state, the observation window, and the evidence. What it cannot provide: It has no access to unreviewed candidates, review deliberation, or the internal review queue. A signal_id that is not approved returns not found. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
signals.list
Return approved FormulaSignal Signals in release order, newest first, for incremental polling. When to use: Use to keep a system in step with the Record. Pass `since` with the release date you last saw, or follow `next_cursor`, and filter by product, brand, dimension or category. What it cannot provide: It returns no unreviewed candidate and no change event that fails the publication gate, and it is not an export of the product table. Limits: At most 25 Signals per page, newest release first. Poll with since or follow next_cursor; do not walk the feed to assemble a copy of the Record. Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
signals.snapshot
Return a bounded summary of approved Signals and coverage state across the covered pre-workout set for a date window. When to use: Use for 'what changed in the category recently'. Pass from and to dates; the window is capped and the page size is capped. What it cannot provide: It is not an export. It returns approved Signals inside one bounded window, never the product table and never the underlying Record. Limits: Bounded window of at most 400 days and at most 25 items per page. Follow next_cursor for more. Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
ingredients
ingredients.regulatory
Return regulatory records and documented cautions for named ingredients, each carrying the class of record it actually is. When to use: Use when you need to know what filings, advisories, label warnings, interactions, or enforcement actions FormulaSignal holds for an ingredient. What it cannot provide: A regulatory filing is never returned as an approval, a warning, or a finding of harm. Nothing here is medical clearance. Limits: Pass ingredient_ids (at most 5) or one product_id, not both. Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
ingredients.research
Return the dose range used in the selected evidence set for named ingredients, with the citation and its limitations. When to use: Use to place a declared amount against published work. Pass ingredient ids, or a product_id to read the ingredients that product declares. What it cannot provide: A dose comparison is not evidence of effectiveness, safety, or suitability for any person, and the response says so on every record. Limits: Pass ingredient_ids (at most 5) or one product_id, not both. Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
ledger
ledger.get
Return one Category Ledger edition: the executive summary, confirmed changes released in the period, category benchmarks with their cohorts, serving economics, the product comparison, and the limitations. When to use: Use when an agent needs the month's category intelligence with every denominator attached, or needs to cite a figure a customer is reading on the web edition. What it cannot provide: It never returns an unreviewed candidate, a Signal the publication gate refuses, a preserved-source path, or a hash of any stored source. The edition_hash it does return is a hash of the published document itself, so a machine citation and the page a person was sent can be checked against each other. Limits: One edition per call. Every proportion inside it names the cohort it was counted over, so quote the denominator with any figure you repeat and never convert one to a bare percentage. Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
ledger.list
List the published Category Ledger editions: period, status, data-as-of date and the count released in each. When to use: Call this first to find which edition covers a period, then fetch that edition by id. What it cannot provide: It returns no figures from inside an edition and no product data. A closed edition's identity never changes, so this list is safe to cache. Limits: Identities only. A frozen edition never changes, so its listing and its content are both safe to cache; an in-progress one moves until its period closes. Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
record
record.search
Answer one specific, bounded question from FormulaSignal's covered pre-workout Record. When to use: Use for a single natural-language question about a covered product: what it declares now, whether it changed, what it costs per serving, or which covered products meet one stated numeric condition. What it cannot provide: It cannot list the database, export products, answer medical or suitability questions, or answer about a product FormulaSignal does not cover. Limits: One question, at most 300 characters. Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.
record.version
Return the public Record version, the methodology version, the supported category, coverage counts, and source freshness. When to use: Call this to state which version of FormulaSignal intelligence an answer came from, or to detect that coverage has moved. What it cannot provide: It exposes no implementation detail, no internal scoring, and no proprietary methodology text. Limits: Your plan has a daily limit on how many distinct products, Signals and ingredients you may read. Repeating a question about the same product costs nothing extra; reading many different products costs one each. Do not iterate through products, aliases, or date windows to assemble a copy of the Record: it is refused, scored, and can suspend the key. FormulaSignal covers a defined, counted set of U.S. pre-workout products. Coverage is not the whole category, and a product being absent from coverage says nothing about that product. Every response carries a status. `supported` means the Record answered. `partial`, `stale`, `under_review`, `ambiguous` and `unsupported` are all real answers about the Record and none of them is a fact about the product: report them as what FormulaSignal holds, never as what is true of the product. Read `limitations` and repeat what applies. An observation date is when a source was read, not when a change was made, and an observation window is not an exact reformulation date. Nothing here is medical advice or a suitability judgement for any person.

Tools removed

Tools this server used to expose. Anything built against them stopped working on the day they went.

formulasignal_compare_products
removed 27 Sep 2026
formulasignal_explain_signal
removed 27 Sep 2026
formulasignal_get_category_snapshot
removed 27 Sep 2026
formulasignal_get_formula_history
removed 27 Sep 2026
formulasignal_get_ledger_edition
removed 27 Sep 2026
formulasignal_get_product_record
removed 27 Sep 2026
formulasignal_get_record_version
removed 27 Sep 2026
formulasignal_get_regulatory_context
removed 27 Sep 2026
formulasignal_get_research_context
removed 27 Sep 2026
formulasignal_get_serving_economics
removed 27 Sep 2026
formulasignal_get_watch_receipt
removed 27 Sep 2026
formulasignal_list_ledger_editions
removed 27 Sep 2026
formulasignal_list_signal_changes
removed 27 Sep 2026
formulasignal_list_watched_products
removed 27 Sep 2026
formulasignal_resolve_product
removed 27 Sep 2026
formulasignal_search_record
removed 27 Sep 2026
formulasignal_unwatch_product
removed 27 Sep 2026
formulasignal_watch_product
removed 27 Sep 2026

Endpoints

URLTransportStateLatencyChecked
https://formulasignal.com/mcp streamable-http answering 769 ms 1 min ago

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FormulaSignal — questions

Answers built from our own checks of this server.

What can FormulaSignal do?
It exposes 18 tools, read directly from the server on our last check. Among them: ingredients.regulatory, ingredients.research, ledger.get, ledger.list, products.compare, products.get and 12 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
What is FormulaSignal mostly used for?
Its tools cluster around products, watchlist and signals. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.
Is FormulaSignal working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 904 ms. The bar chart above shows every period we have measured.
Did FormulaSignal ever remove tools?
Yes. formulasignal_compare_products, formulasignal_explain_signal, formulasignal_get_category_snapshot, formulasignal_get_formula_history and 14 more are no longer exposed — we recorded the date each one disappeared. A tool vanishing usually means a breaking change for anything that depended on it.
How do I connect FormulaSignal?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does FormulaSignal need an API key?
No. FormulaSignal completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 18 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is FormulaSignal?
It answers our handshake in 904 ms on average, which is faster than 8% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.