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Model Context Protocol

Ask Your AI About Your Own Stack

General AI assistants can tell you what a CDP is. They cannot tell you what your CDP costs, when it renews, or what it is connected to. Connect one to Stack Builder and it can.

How to connect See every tool

Server address

https://mcp.martechstackbuilder.com

Read-only: it never writes to your account. Free with a Martech Stack Builder account: connect, sign in or create a free account, and the vendor cards (alternatives, head-to-head, ownership, status, market pulse) work on every plan. Your stacks (stack map, audit, renewals) need Consultant or higher.

Your stack, as cards you can click

Ask in Claude or ChatGPT and the answer comes back as a card in the chat: your stack as a map you can open full screen, what is down, the alternatives to a tool, two tools side by side.

Film, 45 seconds, no sound. In Claude, asking for the Ecommerce and retention stack returns a stack map card with ten tools and Twilio SendGrid marked as needing attention; it opens full screen and a click on Twilio SendGrid shows it degraded, its price, owner and connections. Asking whether anything is down returns a status card: 3 of the 23 vendors we watch report issues, with fourteen days for each. Asking for alternatives to mParticle returns a carousel of alternatives, scrolled from Twilio Segment to Census. In ChatGPT, Braze or Iterable returns a head-to-head card with their capabilities and where they differ. It ends on the server address, mcp.martechstackbuilder.com.

Answers as cards, not just text

In Claude and ChatGPT these questions come back as cards. The first five work on every plan with a free account.

Alternatives card for mParticle: Twilio Segment marked Direct replacement, Meiro CDP and Tealium AudienceStream marked Overlapping, each with price, owner and a Compare with mParticle button. Above them: mParticle is now part of Rokt (closed Jan 2025).
Alternatives. Ranked as our alternatives page ranks them; one button per card compares it with the vendor you asked about.
Braze versus Iterable card: Direct substitutes, the reviewed note, Switching is a project, not a swap, bars of core and supported capabilities (26 and 21 for Braze, 10 and 30 for Iterable) and five differences.
Head-to-head. The reviewed verdict word for word, capabilities on each side, and where the records differ.
Ownership timeline for Salesforce: Informatica in November 2025 for $8.0B, Contentful in September 2026 and Intercom in September 2026 for $3.6B, with source links.
Ownership. Deals on a timeline, each with its source and its row in the Market Report.
Status card: 3 of the vendors we watch report issues, Gorgias, Twilio SendGrid and Sprinklr, each with its status line and a strip of 14 days.
Status. What vendors' own status pages report now, with the last 14 days.
68 tools in our catalogue changed hands since 2023: bars by year (8, 14, 25 and 21) and buyers by kind, software companies 44 and private equity 13 first.
Market pulse. The Market Report in one card, with links to the report and its deal list.
Stack map of the Ecommerce and Retention stack: ten tools with their logos and connections, Twilio SendGrid marked as needing attention, and four counts: 10 tools, 12 connections, 1 needs attention, 0 changed owner.
Stack map (Consultant). Your stack as you laid it out, with a marker where something needs attention. It opens full screen; click a tool for its status, owner, price and alternatives.

Four steps, once

No API keys to rotate, no tokens to paste into a config file. You sign in and approve, the same as any other connector.

  1. 1

    Copy the server address

    The address is https://mcp.martechstackbuilder.com, the same for every account. Stack Builder also shows it under Settings → Connected apps, next to the switches for RFI prices and terms and for agreements.

  2. 2

    Add it as a connector

    In Claude (web or desktop): Settings → Connectors → Add custom connector, and paste the address. In ChatGPT, add the same address as a custom connector.

  3. 3

    Sign in or create a free account, then approve

    You sign in with your Stack Builder account, or create a free one on the same screen, and approve access on a consent screen. Nothing is shared until you do. Claude asks once before it shows a card: choose Allow.

  4. 4

    Ask

    Ask about any vendor straight away ("alternatives to mParticle"). For your own stacks, "list my workspaces" is the place to start. Already connected? Remove and re-add the connector to pick up new cards.

What you can ask

You do not name tools. You ask a question and the assistant picks them.

“What are the best alternatives to mParticle?”

Any plan

Up to eight alternatives, ranked exactly as our public alternatives page ranks them, as a carousel of cards: each with its logo, whether a person reviewed it as a direct replacement or an overlap, a price where the catalogue has one, and who owns it now.

“Braze or Iterable?”

Any plan

The reviewed verdict for the pair word for word, how hard switching is, core and supported capabilities on each side, and where the records differ. The full capability matrix opens full screen.

“What has Salesforce bought lately? Is Census still independent?”

Any plan

Acquisitions, mergers, renames and shutdowns from our researched ownership ledger, on a timeline, each with its source and its row in the Martech Market Report.

“Is anything having an outage today?”

Any plan

The vendors whose own status pages report a problem right now, each with the last 14 days. Signed in on Consultant or higher, it can be narrowed to the tools in one of your stacks.

“How much consolidation is there in martech?”

Any plan

The Market Report's headline numbers as a card: tools that changed hands by year, who is buying, and links to the report and its deal list.

“Show me my Ecommerce & Retention stack.”

Consultant

The stack as you laid it out, logos on every tool, with a marker where a vendor reports a problem or changed owner. Full screen, click a tool for its status, owner, price and top alternatives.

“Which vendors in my CDP Rollout stack talk to each other, and how?”

Consultant

Returns the vendors with their categories and roles, plus every data-flow connection between them.

“What does that stack cost per month, and what renews in the next 90 days?”

Consultant

Per-vendor monthly and annual cost, totals per currency, and every tool renewing in the window with its notice date and auto-renewal, from the budget lines on your stacks.

“Audit my CDP Rollout stack: what overlaps, and what could we save?”

Consultant

The grade, each overlapping pair with the engine's verdict, recoverable spend a year and keep or remove per tool, the same numbers as the Evaluate tab. Your assistant explains them; it does not make them up.

“Prep me for the Braze renewal.”

Consultant

When it renews and the date to give notice by, the tools that already cover what it does, seat use and the vendor's fiscal year-end. Contract terms only on Enterprise with agreements access on.

“What is waiting on me this week?”

Consultant

Your Inbox, as the app shows it: change requests asking for your vote, RFIs to score, your open tasks with due dates, and unread mentions.

“Where do my open RFIs stand, and how do the vendors compare so far?”

Consultant

Each RFI with the stage it is in, its due date and vendors, who has responded and how far scoring has got, and each vendor's consensus total score. Prices and commercial terms only if you turn them on. Questions, answers and per-dimension scores stay in the app.

“What change requests are open on this team, and which are still waiting for approval?”

Team

Change requests with status, change type, priority, due date, approval mode and the number of nodes each one affects. Approver names and votes are not shared.

“Which contracts have a notice period shorter than 60 days?”

Enterprise

Agreement fields: annual value, contract and renewal dates, auto-renewal and notice period. Never the document text.

“Find customer data platforms that mention identity resolution.”

Any plan

Searches vendor names and descriptions in the catalog for a keyword. No stack required.

Every tool on the server

All 23 rows, all read-only. Nothing is hidden behind a vague “and more”.

Tool What it returns Plan
list_workspaces Your personal and team workspaces, each with its plan and which tools it includes. Any plan
search_vendors Catalog search: a keyword matched against vendor names and descriptions. Any plan
get_vendor One vendor: category, description, website, headquarters, parent company, and its known capabilities (core or supported), each with the vendor page that evidences it. Any plan
get_vendor_alternatives Up to eight alternatives to a vendor, ranked as our public alternatives page ranks them: relationship (labelled only where a person reviewed the pair), reviewed note, price summary, current owner. Shown as a carousel card. Any plan
compare_vendors Two vendors head to head: the reviewed verdict and note, switching effort, core and supported capability counts, the top differences, the full capability matrix and prices. Shown as a card; the matrix opens full screen. Any plan
get_ownership Ownership changes for a product, or the products a buyer took and still owns: event, dates, disclosed value, summary, source and the Market Report row. Shown as a timeline card. Any plan
get_vendor_status Live status from each vendor's own status page with a 14-day strip: everything not operational right now, or one vendor. Narrowing to the tools on one of your stacks needs Consultant. Shown as a card. Any plan
get_market_pulse The Martech Market Report's headline numbers: tools that changed hands by year, buyers by kind, the share that publish a price, links to the report and its CSV. Shown as a card. Any plan
list_stacks Stacks in a workspace: vendor and connection counts, saved grade, last updated. Consultant
get_stack One stack: tools with category and role, groups, data-flow connections, saved grade, summary stats, and the saved layout with a marker where a vendor reports a problem or changed owner. No costs or owners. Shown as a stack map card that opens full screen. Consultant
get_stack_tool Used only by the stack map card, never by the assistant: one tool's status, owner, price and top three alternatives when you click it. Consultant
get_stack_costs Per-vendor monthly and annual cost and renewal date, totals per currency, media spend kept apart. No breakdown by department. Consultant
list_rfis Your RFIs: title, stage (Draft, Send, Collect, Score or Decide), category, target and replaced vendor, due date, vendors, how many have responded. No prices or terms. Consultant
get_rfi One RFI: the same, plus each stage with its status, progress (invited, responded, scored, agreed), scoring progress, each vendor's invitation status, whether it responded and its consensus total score. Prices vendors stated and the commercial terms you entered only with RFI prices and terms turned on. No questions, answers or per-dimension scores. Consultant
list_proposals Change requests: title, status, type, priority, due date, stack. Team
get_proposal One change request: description, status, approval mode, number of affected nodes, resolution, implementation status. Not who approved or voted. Team
list_agreements Agreement metadata: vendor, type, status, annual value, dates, renewal, auto-renewal, notice period. Enterprise
get_agreement One agreement: commercial terms, SLA, security posture, data protection, extracted legal clause fields. Enterprise
get_inbox What is waiting on you: votes, RFIs to score, changes to apply or close, your tasks with due dates, unread mentions. Each with a link into the app. Consultant
list_renewals Tools renewing in the next 90 days (or a window you choose): renewal date, notice period and the date to give notice by, auto-renewal, annual value. From budget lines, not agreements. Shown as a table card in Claude and ChatGPT. Consultant
get_stack_audit The verdict on a stack, from the same engine as the Evaluate tab: grade, overlapping tools with the verdict on each pair and whether a reviewed verdict backs it, recoverable spend a year, and keep, evaluate or remove for every tool. Shown as a card in Claude and ChatGPT. Consultant
get_renewal_brief Negotiation facts for one tool: renewal and notice dates, annual value and next year's cost from the budget line, tools that already cover what it does, seat use, the vendor's fiscal year-end. Confirmed contract terms only on Enterprise with agreements access on. Shown as a card in Claude and ChatGPT. Consultant
search / fetch For ChatGPT deep research and connectors: search your stacks, change requests, RFIs and the vendor catalog, then fetch one by id. The same plan rules as the tools above. Consultant

What it deliberately cannot do

Connecting an AI assistant to procurement data is a decision your security team will have an opinion about. Here is the shape of the answer.

Read-only, with no exceptions

Every tool is annotated read-only and there is no write path. An assistant cannot create, edit, delete or share anything in your account — the worst a bad prompt can do is ask a question.

Your permissions, not new ones

Every request is checked against your own access. The connection sees exactly what your own account sees and nothing beyond it — joining a workspace or leaving one changes what the assistant can read, immediately.

The documents stay here

Agreement tools return structured fields: values, dates, notice periods, and the clause text our extraction pulled out (liability, termination, governing law and similar). The uploaded file and its full text are never sent to an AI client.

RFI prices and terms are off until you say so

RFI tools return stages and progress. Prices and commercial terms come only after you turn on "Allow RFI prices and terms" in Settings → Connected apps, only for RFIs where you can see confidential details, and never through organisation-wide access. Every read is logged on the RFI. You can turn it off again without touching the connector.

Agreements are off until you say so

Even on Enterprise, agreement access starts disabled. You turn it on per account in Settings → Connected apps, and you can turn it off again without touching the connector.

One workspace per call

Tools take a workspace id and answer for that workspace alone. Nothing bleeds between your personal work and a client team.

More detail on how the platform handles your data is on the security page.

Frequently Asked Questions

What is MCP?
The Model Context Protocol is an open standard for connecting AI assistants to external systems. Instead of pasting screenshots or exports into a chat, the assistant queries the source directly — in this case your own stacks, vendors, costs and procurement records in Martech Stack Builder.
Which AI clients work with it?
Claude (web and desktop) is the client we test against. ChatGPT takes the same address as a custom connector. Clients that sign in through a redirect to your own machine, such as Claude Code and Codex, have not been tested yet, so we do not list them as supported.
Which plan do I need?
None for the vendor tools: they are free with a Martech Stack Builder account. Connect, sign in or create a free account, and alternatives, head-to-head comparisons, ownership, vendor status and the market pulse work on every plan. Your stacks need Consultant or higher: stack, stack map, cost, renewal, audit, Inbox and RFI tools need Consultant, change requests need Team (or Agency), and agreements need Enterprise plus an opt-in each person turns on for themselves. RFI prices and terms need their own opt-in, on any plan with the RFI tools.
Can the assistant change my diagrams?
No. Every tool is read-only and there is no write tool in the server at all. The connection can answer questions about your stack; it cannot alter it.
Does it send my vendor contracts to the AI?
Not the documents. Agreement tools return structured fields — vendor, value, contract dates, renewal terms and the clause text our extraction pulled out — and never the file or its full text. Your AI client does receive those fields. The access is off by default and has to be switched on per account.
Does it send RFI prices to the AI?
Only if you turn it on. By default the RFI tools return stages and progress and no money. After you turn on "Allow RFI prices and terms" in Settings → Connected apps, your assistant also gets each vendor's annual and three-year cost (stated by the vendor, captured by your scorers or entered by you) and the commercial terms you entered, for RFIs where you can see confidential details. Organisation-wide access never includes them. Every read is logged on the RFI. Questions and answer text are never sent.
Why do I need an account for the free tools?
Claude and ChatGPT call the server from their own addresses, so without a sign-in every person would look the same to us. An account keeps the limits per person and lets us tell people apart. A free account is enough, and you can create it on the connector's sign-in screen.
I connected before. Why do I not see the new cards?
Claude and ChatGPT read the list of tools and cards when you connect. Remove the connector and add it again (or refresh it), then ask in a new chat. Claude asks once before it shows a card: choose Allow.
What is the server address?
https://mcp.martechstackbuilder.com. It is the same for every account; what the assistant can read depends on who signs in. Stack Builder also shows it under Settings → Connected apps with a copy button.
How do I disconnect?
Remove the connector in your AI client, the same way you added it. You can also turn off RFI prices and terms, or agreement access, on its own from Settings → Connected apps and leave the rest of the connection in place.

Your stack, in the assistant you already use

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