The best GTM tools for Claude Code depend on how much of the motion the agent runs. OXYGEN puts tables, enrichment, sequences, a CRM and workflows behind one CLI and MCP server, with approvals and credit ceilings. It starts free, with paid plans from $49 a month. Another route is a DIY stack: Apollo for data, a sequencer such as Instantly, and HubSpot's Agent CLI for the CRM. Clay and Deepline run enrichment, and Firecrawl handles web research.
By Tim Scheuer, Co-founder of Oxygen · Checked October 24, 2026
A GTM (go-to-market) tool suits a coding agent when the agent can call it, run it unattended and cap what it sends or spends. Coding agents such as Claude Code, Codex and Cursor work in a terminal, so the tool needs a CLI or an MCP server. A CLI is a command-line tool, and MCP is an open standard that lets AI apps plug into outside tools. Many unattended runs are headless: on a server or a schedule, with no browser for an OAuth sign-in and nobody at the keyboard. The tools also differ in what they cover. Enrichment adds emails and company facts to contacts. A sequence is a timed series of emails or messages. The CRM is where contacts and deals live.
| Tool | CLI, MCP or API | What it covers | Auth for headless runs | Approvals and safety | Cost and rate limits | Starts at |
|---|---|---|---|---|---|---|
 OXYGENAgentic marketing and sales platform | CLI with skills, hosted MCP server, and the API behind both | Tables, enrichment waterfalls, sequences on email, LinkedIn and WhatsApp, CRM, workflows | oxygen api-keys create, then oxygen auth use-token where the CLI runs | Paid steps need --approved and --max-credits; launches need approval, plus a send cap for email, WhatsApp or CRM tasks | Previews free; paid steps on credits under your ceiling; exit 6 on rate limits | Free plan; sending accounts need a paid plan, from $49 a month |
 Apollo.ioContact database with an MCP server, CLI and REST API | Hosted MCP server, a CLI with a Claude Code skill, and REST API | People and company search, enrichment, contacts, deals, sequences, one-off emails | MCP: master API key in an X-Api-Key header, scoped keys refused; the REST API takes scoped keys | MCP: per-tool allow, approve or block in the client, and one-off emails need a confirm; the CLI sends a drafted email immediately | Enrichment and company search on credits; REST API on Free: 50 calls a minute; MCP limits are separate | MCP on any plan, the Free plan included, at no extra cost |
 ClayData enrichment platform with a CLI and agent plugin | Agent plugin with skills, the clay CLI, MCP for Reps and a Public API | People and company search, enrichment functions, pre-release Workflows, table queries | clay login --device on SSH; API key in the clay-api-key header | Enterprise budgets cap workflows the CLI builds; the API can hold some commands for approval; MCP for Reps caps each rep on paid plans | Public API limit per workspace, number unpublished; the CLI exits 4 with retryAfter; routines show a credit estimate per item | Free plan; Launch from $167 a month billed yearly; Clay's docs put the CLI and API on every plan |
 DeeplineGTM data platform built for coding agents | CLI with hosted skills; REST API, SDK and MCP | Search, enrichment and signals across 113 integrations; writes to CRMs and sequencers | Workspace API key in a request header; the CLI reads it from .env.deepline or signs in by browser | Per-run cap refuses an over-cap call before provider work; a monthly workspace cap sits above it | Icypeas email from $0.014, LeadMagic phone from $0.17; own keys: 50K calls a month, then $0.005 | Pay as you go at $0 plus usage; Growth $395 a month plus usage; 10 credits are $1 |
 HubSpot Agent CLICRM with an agent CLI and remote MCP server | Agent CLI with skills; remote MCP server at mcp.hubspot.com | Contacts, companies, deals, tickets, associations, workflows, sequences, reports | Service key in HUBSPOT_ACCESS_TOKEN (admin mode); OAuth login otherwise | --dry-run on writes; local history of destructive operations | No CLI limit published; service keys get private-app limits of 100 to 190 calls per 10 seconds, by tier | All HubSpot products and plans; no CLI fee stated |
 InstantlyCold email platform with a CLI and MCP server | CLI, local MCP through instantly mcp, hosted MCP, API v2 | Campaigns, leads, sending accounts, email and analytics | INSTANTLY_API_KEY, with scopes you pick per key | Key scopes limit reach; API approvals cover only its AI Sales Agent's actions | Workspace limit of 100 requests a second and 6,000 a minute | Growth $47 a month on monthly billing |
 FirecrawlWeb scraping and search API with a CLI | CLI with skills, hosted MCP server, API | Scrape, search, map, crawl, agent jobs and monitors on the web, plus work emails through Alexandria | FIRECRAWL_API_KEY, or an API key on the MCP server | No CRM or sequencer commands in the CLI; --max-credits caps agent jobs | 1 credit a basic page; search 2 credits per 10 results; Free 10 scrapes a minute | Free with 1,000 credits; Hobby $16 a month billed yearly; Standard $83 |
OXYGEN Agentic marketing and sales platformBest for: GTM engineers whose coding agent should build lists, enrich them, run sequences and update a CRM in one workspace, with approvals on paid steps.
OXYGEN gives Claude Code, Codex and Cursor the oxygen CLI with skills; Claude Code and Codex can also use its hosted MCP server. One workspace holds tables, sequences across email, LinkedIn and WhatsApp, a CRM with a deals pipeline, and hosted workflows. Enrichment waterfalls try providers in order until one finds the value. Paid steps and CRM syncs need --approved and a --max-credits ceiling, and a sequence launch stays a preview until you pass --approved.
Apollo.io Contact database with an MCP server, CLI and REST APIBest for: Coding agents that need Apollo's contacts and sequences, for example as the data half of a do-it-yourself stack.
In a do-it-yourself stack, Apollo can supply the contacts while a sequencer sends. Its hosted MCP server at mcp.apollo.io/mcp documents Claude Code and Codex setup and signs in with OAuth. Headless clients send a master API key in an X-Api-Key header; scoped keys are refused there. Its MCP tools search people and companies, enrich on credits, write contacts, deals and sequences, and send one-off emails after you confirm. Scripts can use Apollo's CLI or its REST API.
Clay Data enrichment platform with a CLI and agent pluginBest for: Clay customers who want Claude Code, Codex or Cursor to search Clay's data and run its enrichment functions from the terminal.
Clay's agent plugin installs its skills and the clay CLI in Claude Code, Codex or Cursor, on every plan, Free included. It needs a shell, so chat apps such as ChatGPT reach Clay through MCP for Reps instead. The CLI prints JSON for scripts, and exit codes separate auth failures (3), rate limits (4) and not-found errors (6). An agent can search companies and people, run Clay-managed functions and Workflows, and query tables.
Deepline GTM data platform built for coding agentsBest for: GTM engineers who want one CLI over many data providers, with Plays they can version and rerun on CSV files.
Deepline is built around the terminal. Its deepline setup command installs a hosted skill bundle for Claude Code, Codex, Cursor, Gemini CLI or Antigravity. The agent then runs Plays against CSV files. Its site counts 113 integrations and more than 3,700 tools, and Plays can write results to a connected CRM or sequencer. A per-run cap refuses an over-cap call before any provider work. The REST API takes a workspace API key, and MCP serves clients without a shell.
HubSpot Agent CLI CRM with an agent CLI and remote MCP serverBest for: HubSpot teams whose coding agent should clean, update and bulk-edit CRM records from scripts or on a schedule.
HubSpot put its Agent CLI in public beta in June 2026. It is a separate binary for Claude Code, Claude Cowork and Codex, aimed at scheduled jobs and bulk work. Commands cover objects, pipelines, workflows, sequences, reports and imports, and read and write JSONL, one JSON record per line. Signing in with hubspot auth login keeps the user's permissions, and admin mode uses a service key. Every write command accepts --dry-run, and a local history logs destructive operations.
Instantly Cold email platform with a CLI and MCP serverBest for: Teams sending cold email from Instantly whose agent should manage campaigns, leads and sending accounts from scripts.
Instantly publishes a CLI, @instantlyai/cli, over its API v2 for campaigns, leads, accounts, email and analytics, with JSON output by default. Scripts set INSTANTLY_API_KEY with no prompt, and each key carries only the scopes you choose. Its instantly mcp command starts a local MCP server, and a hosted one needs no install. Its help center says every Outbound plan includes API access, while its pricing table marks API, webhooks and integrations only from Hypergrowth.
Instantly website · Oxygen vs Instantly: the full comparison
Firecrawl Web scraping and search API with a CLIBest for: Agents that research accounts on the open web: scrape sites, search, crawl and pull structured fields for scoring or copy.
Firecrawl covers web research, the step before an agent scores an account or writes copy. Running npx firecrawl-cli init sets up skills for Codex, Claude Code, Cursor and OpenCode. The CLI scrapes pages, searches the web, maps and crawls sites, runs agent jobs and schedules monitors that diff pages over time. Its Alexandria catalog adds work emails from providers such as Apollo. The CLI has no CRM or outreach commands, and firecrawl --status shows the credits left.
| If you need | Pick |
|---|---|
| One workspace for lists, enrichment, sequences and CRM, with approvals before sends and paid steps | OXYGEN |
| Contact data and sequences as the data half of a do-it-yourself stack | Apollo.io |
| Run your existing Clay enrichment from the terminal | Clay |
| Many data providers behind one CLI, with hard per-run credit caps | Deepline |
| Bulk HubSpot CRM updates with a dry run first | HubSpot Agent CLI |
| A scriptable cold email sender on a scoped API key | Instantly |
| Web research on accounts before scoring or writing copy | Firecrawl |
Any tool with a CLI, an MCP server or an API Claude Code can call. OXYGEN covers lists, enrichment, sequences and a CRM in one workspace. Apollo supplies contacts, Clay and Deepline run enrichment, Instantly sends cold email, HubSpot's Agent CLI updates the CRM, and Firecrawl researches accounts on the web. Codex and Cursor can run the same CLIs and connect MCP servers.
In Claude Code, run claude mcp add --transport http <name> <url>, then run /mcp and complete the OAuth sign-in. In Codex, add the server URL to its MCP configuration; OXYGEN's docs connect it with ?toolset=core, which lists a smaller set of tools. Apollo documents both clients; HubSpot's Agent CLI and Clay's plugin skip MCP setup and install a CLI with skills instead.
A CLI suits longer jobs in a terminal. The agent pipes files in and out, branches on exit codes, and the same commands run in a script or a scheduled job later. MCP suits clients without a shell and quick lookups. Deepline, Clay and HubSpot steer coding agents to their CLIs. OXYGEN offers both, and its docs make the CLI the main route for Claude Code and Codex, with large files imported through the CLI.
Use a key the vendor issues for that purpose and keep it in an environment variable or secret store, never in a prompt. Instantly reads INSTANTLY_API_KEY with scopes you choose, and HubSpot's admin mode reads HUBSPOT_ACCESS_TOKEN. Firecrawl reads FIRECRAWL_API_KEY, and Apollo's MCP server needs a master key in a header. OXYGEN creates a token with oxygen api-keys create and stores it with oxygen auth use-token.
Reads and previews can run unattended. Sends, CRM writes and paid enrichment need a human or a hard cap first. OXYGEN previews sends and launches until you pass --approved and refuses paid steps without a credit ceiling. HubSpot previews writes with --dry-run, and Deepline refuses calls over a run cap. Apollo recommends approval on tools that spend credits, and Clay's API can hold some commands for approval. Instantly's CLI and API docs describe no approval step before your own sends.
For many teams, yes. Claude Code writes the glue, Apollo supplies contacts, a sequencer such as Instantly sends, and HubSpot holds the records. The cost is the glue: three sets of keys and three rate limits, plus the scripts Claude Code writes to connect them. OXYGEN keeps lists, enrichment, sequences and the CRM in one workspace, so a reply on any channel stops that lead's sequence.
Set the cap in the tool, not in the prompt: Deepline's docs note that a budget stated in chat does not enforce a cap. OXYGEN and Deepline take --max-credits on a run, and OXYGEN skips rows past the ceiling instead of charging. For rate limits, read the published numbers, such as Apollo's per plan or Instantly's 6,000 a minute. Then retry on the exit code: 6 in OXYGEN, 4 in Clay.
We make OXYGEN, so it comes first and you should read this as an interested list. We chose the other GTM tools for Claude Code ourselves, and each entry says who it suits.
Facts and prices for every tool but OXYGEN come from its vendor's own pages, such as its website, pricing and docs. We checked them on the dates below. OXYGEN's facts and prices come from the product and its live price list.
The products named here are trademarks of their owners and are not affiliated with OXYGEN. Something out of date? Tell us.