# How do I build a prospect list with an AI agent? The chain, and its coverage > Building a target list with an agent: the five jobs it needs, how many tools carry each one, and which parts of the chain have almost no MCP coverage. *Markdown twin of the HTML page at the same path. Same content, no navigation, no styling, no scripts. Links below point at other twins. Site map for machines: [llms.txt](../llms.txt). The whole dataset: [directory.json](../data/directory.json).* --- [Directory](../index.md) / [Learn](index.md) / How to actually do it **How to actually do it** # How do I build a prospect list with an AI agent? **The short answer** The chain is: define the account criteria, search a company database, enrich each company, find the right people inside them, then score and prioritise. Each of those is a separate job in this directory with its own coverage, and the account list step is the thinnest link. ## The chain | Step | The job | Tools tagged | Official MCP | Free tier | |---|---|---|---|---| | Build the target account list | [build a target account list](../jobs/build-target-account-list.md) | 7 | 4 | 0 | | Search companies by firmographics | [search companies by firmographics](../jobs/search-companies-by-firmographics.md) | 15 | 12 | 3 | | Enrich each company from its domain | [enrich a company from a domain](../jobs/enrich-company-from-domain.md) | 34 | 26 | 12 | | Search people by criteria | [search people by criteria](../jobs/search-people-by-criteria.md) | 24 | 15 | 5 | | Score and prioritise | [score and prioritize leads](../jobs/score-and-prioritize-leads.md) | 24 | 15 | 3 | Counted 2026-08-25. Entry counts rather than product counts. ## Where it is thin [build a target account list](../jobs/build-target-account-list.md) is tagged on only 7 entries, of which 4 have an official server. In practice this step is usually done by combining a firmographic search with a signal rather than by a tool sold as list building, which is a reasonable thing for an agent to orchestrate itself. ## The tools with the deepest coverage in the chain - [Prospeo](../tools/prospeo.md) Official MCP · Free to start A B2B contact database/lookup tool that finds verified work emails and mobile phone numbers for a given person or domain and returns basic... - [ZoomInfo](../tools/zoominfo.md) Official MCP · Free to start A B2B contact/company database and go-to-market platform (500M+ contacts, 100M+ companies) built from web crawling, public filings, and human... - [Apollo.io](../tools/apollo-io.md) Official MCP · Paid, self-serve A combined B2B contact database (265M+ contacts) and sales engagement platform in one product - prospect search/filtering, email and call sequencing,... - [Coresignal](../tools/coresignal.md) Official MCP · Paid, self-serve Sells structured B2B datasets and APIs (company, employee/people, job-posting records) scraped and normalized from public and professional-network... - [Crustdata](../tools/crustdata.md) Official MCP · Gate unknown A real-time API for company and person firmographic/growth data (headcount trends, funding, tech stack, web traffic, social signals), positioned as... - [Fiber AI](../tools/fiber-ai.md) Official MCP · Paid, self-serve B2B search and enrichment APIs for finding companies and people by structured filters or natural language, then revealing work emails and phone... - [Lead411](../tools/lead411.md) Official MCP · Paid, self-serve A B2B contact and company database with verified emails, direct dials, and growth/intent triggers, queryable by search or by an enrichment API. - [Ocean.io](../tools/ocean-io.md) Official MCP · Paid, self-serve A company-search and "lookalike" prospecting tool that finds businesses similar to a given target account based on industry, size, geography, and... 5 more are on the linked page. The cut is the display limit, not a ranking. ## Add a signal, or you have built a directory rather than a list A list of companies matching a size and an industry is not a prospect list, it is a phone book. The difference is a reason to reach out now. 12 entries are tagged [detect a funding or news event](../jobs/detect-funding-or-news-event.md), 5 are tagged [scrape job postings](../jobs/scrape-job-postings.md), 14 are tagged [detect a company's tech stack](../jobs/detect-technographics.md) and 10 are tagged [track job changes](../jobs/track-job-changes.md). Those are the cheapest sources of a real reason. ## Then stop Building the list and sending to it are different decisions. Keep the send behind a human approval until you have read what the chain produced at least twice, because an agent will build a list of four thousand as easily as forty and will not feel embarrassed about either. ## Sources - [The GTM MCP Directory, by job](../jobs/index.md) this site - [The GTM MCP Directory, Data and Enrichment](../categories/data-enrichment.md) this site Every number on this page is generated from directory.json at build time and carries the date it was baked: 2026-08-25. Nothing is typed by hand, nothing is rounded, and nothing is estimated. The underlying data is [published in full](../data.md). Where the honest answer is a zero, the zero is printed. ## Related questions - [Which tools can enrich a company from its domain?](which-tools-can-enrich-a-company-from-a-domain.md) - [What is buyer intent data?](what-is-buyer-intent-data.md) - [How do I write personalised outreach with an AI agent?](how-do-i-write-personalized-outreach-with-an-ai-agent.md) - [Which tools can identify anonymous website visitors?](which-tools-can-identify-anonymous-website-visitors.md) ## In the directory - [Find people and companies](../jobs/family-find-people-and-companies.md) - [Signals and research](../jobs/family-signals-and-research.md)