Skills/npm/firecrawl-mcp

firecrawl-mcp@3.39.0

VERIFIED

Publisher claims: "Firecrawl MCP server, the context API for AI agents: search, scrape, parse, crawl, map, and interact with the web, run Agent and Monitor jobs, and search scientific papers (PubMed, bioRxiv, medRxiv, arXiv). Works with Firecrawl cloud or a self-hosted inst" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher firecrawl · publishing for 632 daysInstalls 681KLast detonated 4d ago
$claude mcp add firecrawl-mcp -- npx -y firecrawl-mcp
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Coverage

Server started and answered tools/list.
Tested
MCP initialize and tools/list · every tool description, for hidden instructions · every file read, file written and host contacted by what ran
Not tested
what the tools do when called with real credentials

Before you give it your token

It will ask for
FIRECRAWL_API_KEYFIRECRAWL_MCP_SEARCH_OAUTH_ONLYFIRECRAWL_OAUTH_INTROSPECT_CACHE_TTL_MSFIRECRAWL_OAUTH_INTROSPECT_SECRETFIRECRAWL_OAUTH_ISSUERFIRECRAWL_OAUTH_TOKENMCP_DELEGATED_CREDENTIAL_SECRETMCP_OAUTH_ACCEPT_LEGACY_V2_MCP_AUDConfiguration, not credentials: CLOUD_SERVICE, FASTMCP_ENDPOINT, FASTMCP_HOST, FASTMCP_PORT, FASTMCP_STATELESS, FIRECRAWL_API_URL, FIRECRAWL_INTEGRATION, FIRECRAWL_MCP_ALLOWED_HOSTS, FIRECRAWL_MCP_RESOURCE_URL, FIRECRAWL_MCP_SEARCH_ENABLED, FIRECRAWL_MCP_SEARCH_ENDPOINT, FIRECRAWL_MCP_SEARCH_PORT, FIRECRAWL_MCP_SEARCH_RESOURCE_URL, HTTP_STREAMABLE_SERVER, JOB_PATH, SSE_LOCAL
Where it talks to
firecrawl.dev (its own)Also peopledatalabs.com — not the publisher's domain; check what for before connecting.
What the honeypot saw
no credential files read · no network
What we could not test
what the tools do when called with real credentials

Connect it with a scoped credential, under the guard, and read the third-party hosts first. The code names peopledatalabs.com as well as its own vendor. The guard injects FIRECRAWL_API_KEY, FIRECRAWL_MCP_SEARCH_OAUTH_ONLY, FIRECRAWL_OAUTH_INTROSPECT_CACHE_TTL_MS, FIRECRAWL_OAUTH_INTROSPECT_SECRET, FIRECRAWL_OAUTH_ISSUER, FIRECRAWL_OAUTH_TOKEN, MCP_DELEGATED_CREDENTIAL_SECRET, MCP_OAUTH_ACCEPT_LEGACY_V2_MCP_AUD only into requests to firecrawl.dev (and its subdomains) and refuses the rest.

$vet-skills run --secrets FIRECRAWL_API_KEY=firecrawl.dev,FIRECRAWL_MCP_SEARCH_OAUTH_ONLY=firecrawl.dev,FIRECRAWL_OAUTH_INTROSPECT_CACHE_TTL_MS=firecrawl.dev,FIRECRAWL_OAUTH_INTROSPECT_SECRET=firecrawl.dev,FIRECRAWL_OAUTH_ISSUER=firecrawl.dev,FIRECRAWL_OAUTH_TOKEN=firecrawl.dev,MCP_DELEGATED_CREDENTIAL_SECRET=firecrawl.dev,MCP_OAUTH_ACCEPT_LEGACY_V2_MCP_AUD=firecrawl.dev -- npx -y firecrawl-mcp

Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios) on 2026-11-10 and scored it 91/100 (Verified). It did what it claims and nothing else we could detect: no undeclared network egress, no credential reads, no persistent instruction writes. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 31 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
11sprocessdependency install exit 0
31sclaimed26 tools: firecrawl_scrape, firecrawl_map, firecrawl_search, firecrawl_find_tools, firecrawl_crawl, firecrawl_check_crawl_status, firecrawl_agent, firecrawl_agent_status, firecrawl_interact, firecrawl_interact_stop, firecrawl_parse, firecrawl_monitor_create, firecrawl_monitor_list, firecrawl_monitor_get, firecrawl_monitor_update, firecrawl_monitor_delete, firecrawl_monitor_run, firecrawl_monitor_checks, firecrawl_monitor_check, firecrawl_research_search_papers, firecrawl_research_inspect_paper, firecrawl_research_related_papers, firecrawl_research_read_paper, firecrawl_developer_search, firecrawl_gov_search
31sprocessscript backend runs setup only
31sprocessno install scripts to re-run

Static findings

MEDIUM
File type combined with upload actiondist/server.js:2155 · File type combined with upload action — agent may exfiltrate local data files…de in data.alexandria[0].data. Reuse workspaceId with command to filter response.json using jq, grep, head or sed; combine related projections and return small slices, not the full file. saveOutput:true retains large command output in virt…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
File type combined with upload actiondist/index.js:2153 · File type combined with upload action — agent may exfiltrate local data files…de in data.alexandria[0].data. Reuse workspaceId with command to filter response.json using jq, grep, head or sed; combine related projections and return small slices, not the full file. saveOutput:true retains large command output in virt…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
MCP server using network transport (SSE/HTTP)dist/server.d.ts:678 · MCP server using network transport (SSE/HTTP) — data sent over network…LARED_ORIGIN_HEADER, type DeferredResult, type ExtraToolsContext, type FirecrawlMcpServer, type FirecrawlMcpServerHooks, type FirecrawlMcpServerOptions, type FirecrawlMcpServerStartArgs, type HttpApp, type InstructionDefaults, keylessToolN…Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04

Cost to the agent

Instructions loaded
≈101 tok
1 file · 13 in bundle
Tool list per prompt
≈13,504 tok
26 tools · 519 per tool
Handshake
1549 ms
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 640

Tokens estimated at four characters each. The tool list is re-read by the agent on every turn, so it is the number to compare between servers that do the same job: ranked across the index.

Known vulnerabilities

No advisories in OSV for firecrawl-mcp@3.39.0 as of 4d ago. This is the package itself, not its dependencies.