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Rahul D Sarker: Marketing & RevOps Tools
co.rahuldsarker/growth-tools in the official MCP registry.
Endpoint https://rahuldsarker.co/api/mcp.
The registry describes it as: 116 marketing, RevOps and SaaS calculators with benchmarks, guided reviews, content search, booking.
We read its 124 tools on 2026-10-22. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
search_content read_content check_availability roas_calculator ltv_cac_calculator ad_spend_waste_calculator crm_roi_calculator mql_calculator arr_multiple_calculator mrr_to_arr_calculator saas_magic_number_calculator cpl_cpa_calculator roas_to_mer_converter ppc_click_volume_predictor ad_creative_fatigue_forecaster cpa_to_cac_scalability_matrix retargeting_pool_size_estimator performance_marketing_margin_protector impression_share_opportunity_matrix cross_channel_ad_spend_allocator linkedin_ad_cost_threshold_calculator seasonal_ad_cpm_predictor micro_budget_ad_feasibility_checker google_search_impression_share_value_estimator lookalike_audience_pool_calculator ad_frequency_risk_checker landing_page_vs_ad_match_quality_auditor utm_generator_and_validation_helper paid_search_intent_tier_grader creative_testing_duration_forecaster post_ios14_blended_attribution_modeler in_house_vs_fractional_cmo growth_runway_extension_simulator total_addressable_market_estimator brand_vs_performance_budget_allocator product_market_fit_scoring_grader customer_expansion_revenue_matrix growth_strategy_prioritization_tool pricing_elasticity_sandbox burn_rate_optimization_forecaster marketing_agency_pitch_bullshit_detector competitor_ad_spend_benchmarker ltv_growth_multiplier_simulator channel_saturation_estimator product_led_growth_feasibility_grader growth_team_hiring_sequence_planner bootstrapped_vs_venture_scaler_modeler internationalization_market_prioritization_grid annual_growth_goal_back_calculator organic_traffic_value_monetizer strategic_pivot_risk_grader conversion_funnel ab_test_significance_calculator page_speed_leak_calculator above_the_fold_messaging_clarity_grader micro_conversion_value_modeler cart_abandonment_calculator cta_visual_hierarchy_tester typography_legibility_grader mobile_checkout_friction_tester and 64 more
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[](https://lazaretto.dev/mcp-registry/co-rahuldsarker-growth-tools)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.