The best GTM tool for Claude Code depends 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, from $49 a month. The most common alternative 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 19, 2026
A coding agent such as Claude Code, Codex or Cursor works in a terminal: it runs commands, reads and writes files, pipes output into the next step and can repeat a job on a schedule. A GTM tool fits that when it ships a CLI or an MCP server, returns JSON with exit codes the agent can branch on, signs in without a browser for CI, and installs skills that teach the agent its commands. Two questions matter more here than in a chat client: what can run with nobody watching, and what stops a run from sending email or spending credits you did not plan for. The tools below differ most on those two points, and on whether they cover data, outreach or the CRM.
| 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 in CI | --approved and --max-credits on paid steps and launches; previews free | Previews free; paid steps on credits under your ceiling; exit 6 on rate limits | Free plan; paid from $49 a month |
 Apollo.ioContact database with an MCP server and REST API | Hosted MCP server and REST API | People and company search, enrichment, contacts, deals, sequences, one-off emails | Master API key in an X-Api-Key header; scoped keys refused | Per-tool allow, approve or block in the client; one-off emails need a confirm | Enrichment and company search on credits; Free plan 50 calls a minute | 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 and a Public API | People and company search, enrichment functions, Workflows in alpha, table queries | clay login --device on SSH; API key in the clay-api-key header | No approval step or spend cap documented; JSON output with exit codes | Per-workspace rate limit, number unpublished; exit 4 with retryAfter | Free plan; Launch from $167 a month billed yearly; API access on Enterprise |
 DeeplineGTM data platform built for coding agents | CLI with hosted skills; REST API, SDK and MCP | Search, enrichment and signals across 112 integrations; writes to CRMs and sequencers | Workspace API key as a bearer token for the API; the CLI signs in by browser | Per-run and monthly credit caps; over-cap calls refused before provider work | Email found from $0.014, 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; 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 | Private-app API 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; no approval step documented | No per-call fee stated; 100 requests a second, 6,000 a minute | API on all Outbound plans; Growth from $47 a month |
 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 open web | FIRECRAWL_API_KEY, or a bearer key on the MCP server | Reads only; no writes to your tools to approve | 1 credit a 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 three ways in: the oxygen CLI with skills installed into each agent's skill folder, a hosted MCP server (Codex connects with ?toolset=core), and the API both of them call. One workspace holds tables, enrichment waterfalls across 17 email providers, sequences across email, LinkedIn and WhatsApp, a CRM with a deals pipeline, and hosted workflows. Previews and dry runs are free. Paid steps, sequence launches and CRM syncs refuse to run without --approved and a --max-credits ceiling, and exit with code 7 so the agent stops and asks you.
Apollo.io Contact database with an MCP server and REST APIBest for: Coding agents that need Apollo's contacts and sequences, usually as the data half of a do-it-yourself stack.
Apollo is the usual data layer in a do-it-yourself stack: Claude Code or Codex for the logic, Apollo for contacts, and a sequencer for sending. Its hosted MCP server at mcp.apollo.io/mcp documents Claude Code and Codex setup, signs in with OAuth, and takes a master API key in an X-Api-Key header for headless clients; scoped keys are refused there. Tools search people and companies, enrich on credits, write contacts, deals and sequences, and send one-off emails after you confirm. The REST API publishes rate limits per plan, so a script can pace itself.
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 ships one agent plugin for Claude Code, Codex and Cursor that installs its skills and the clay CLI; it does not run in chat apps. The CLI is JSON-first: results go to stdout, errors carry a code, and exit codes separate auth failures (3), rate limits (4, with retryAfter) and missing records (6). An agent can search companies and people, run Clay-managed functions and Workflows as routines, including batch runs over JSONL files, and query tables. On SSH or in a container, clay login --device prints a code to approve from another device.
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: deepline setup installs the CLI and a hosted skill bundle for Claude Code, Codex, Cursor, Gemini CLI or Antigravity, and the agent runs Plays against CSV files. Its site counts 112 integrations and 3,819 tools, including 52 enrichment, 12 sequencing and 5 CRM integrations, and Plays write approved results to a CRM or sequencer. A per-run cap refuses a call that would pass it before any provider work, and a monthly workspace cap sits above that. The REST API takes a workspace key as a bearer token, 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: a separate binary for Claude Code, Claude Cowork and Codex, aimed at scheduled jobs and bulk work. Commands follow hubspot <noun> <verb> across objects, associations, pipelines, workflows, sequences, reports and imports, read JSONL on stdin and write JSONL by default. hubspot auth login signs in with the user's permissions, and admin mode reads a service key from HUBSPOT_ACCESS_TOKEN. Every write command accepts --dry-run, and a local history logs destructive operations. The remote MCP server at mcp.hubspot.com covers chat clients.
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: campaigns, leads, accounts, email and analytics, with JSON output by default and --fields to trim it. Scripts and CI set INSTANTLY_API_KEY with no prompt, and each key carries the scopes you choose when you create it, so a headless agent can get a narrow key. instantly mcp starts a local MCP server from the same CLI, and a hosted MCP server needs no install. API access comes with every Outbound plan, and the workspace limit is 100 requests a second or 6,000 a minute.
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 a GTM agent runs before it scores an account or writes copy. firecrawl-cli init sets up skills for Codex, Claude Code, Cursor and OpenCode, and the CLI scrapes pages, searches the web, maps and crawls sites, runs agent jobs against a schema, and schedules monitors that diff pages over time. Agents sign in through a browser or read FIRECRAWL_API_KEY, and the hosted MCP server takes OAuth or a bearer key. It reads the web and writes to none of your systems, so the risk to watch is credits, which firecrawl --status reports.
| 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. The same tools work from Codex, and from Cursor through its terminal.
In Claude Code, run claude mcp add --transport http <name> <url>, then sign in when the OAuth flow opens and check it with /mcp. In Codex, add the server URL to its MCP configuration. Codex has no tool search, so OXYGEN's docs connect it with ?toolset=core. 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 CI 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, 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, searches and previews are safe to run unattended. Sends, sequence launches, CRM writes and paid enrichment should pass a human first or run under a hard cap. OXYGEN refuses those without --approved and a credit ceiling, HubSpot previews writes with --dry-run, Deepline refuses calls over a run cap, and Apollo recommends approval on tools that spend credits. Clay and Instantly document no approval step.
For many teams, yes: it is the most common setup. 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, three rate limits, and your own scripts to stop a lead when they reply. OXYGEN keeps lists, enrichment, sequences and the CRM in one workspace, so a reply on any channel stops the sequence.
Set the cap in the tool, not in the prompt: Deepline's docs note that a budget in chat is an approval limit, not 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, and 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. The other tools are the ones teams compare most often when they pick a GTM tool for Claude Code. Each one is described from its own website, pricing page and docs, checked on the dates below; OXYGEN's facts and prices come from the product and its live price list. Prices are the cheapest self-serve plan each vendor lists.
The products named here are trademarks of their owners and are not affiliated with OXYGEN. Something out of date? Tell us.