Run any Junipr API tool by its slug. 75+ tools available across these categories: VALIDATION & CONVERSION: address-validator, disposable-email-checker, document-format-converter, email-validator, json-to-csv-converter, markdown-to-html, mx-lookup, phone-number-validator, temporary-email-generator...
AI agents invoke run_tool to trigger actions in Junipr MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This is a meta-tool that allows execution of any tool in a 75+ tool catalog. While individual tools in the VALIDATION & CONVERSION and ANALYSIS & PROCESSING categories may be benign, the ability to run any of them with arbitrary parameters (via slug selection) constitutes Execute-class risk.
From the tool's definition Tool description states 'Run any Junipr API tool by its slug' with access to '75+ tools' spanning multiple categories including domain operations, content analysis, and data conversion.
Attacks that exploit this kind of access
Run any Junipr API tool by its slug. 75+ tools available across these categories: VALIDATION & CONVERSION: address-validator, disposable-email-checker, document-format-converter, email-validator, json-to-csv-converter, markdown-to-html, mx-lookup, phone-number-validator, temporary-email-generator ANALYSIS & PROCESSING: ai-content-detector, brave-search, domain-whois-lookup, google-position-checker, image-to-pdf, image-to-text, lighthouse-checker, multi-resolution-screenshot, pdf-ocr-tool, pdf-to-html, pdf-to-text, rag-web-extractor, resize-image, sentiment-analyzer, seo-audit-tool, tech-stack-detector, watermark-image, web-page-change-monitor, webm-to-mp4, website-performance-analyzer, website-tech-stack-detector, website-to-rss SCRAPERS & DATA EXTRACTION: amazon-reviews-scraper, b2b-lead-scraper, bluesky-scraper, booking-scraper, capterra-reviews-scraper, contact-info-scraper, craigslist-scraper, earnings-call-scraper, ebay-sold-listings, etsy-product-scraper, finance-news-scraper, fiverr-scraper, g2-reviews-scraper, github-trending-scraper, glassdoor-jobs-scraper, google-ads-affiliate-checker, google-news-scraper, google-shopping, hacker-news-scraper, healthcare-scraper, indeed-job-scraper, medium-scraper, news-sentiment-analyzer, pagesjaunes-scraper, price-comparison, product-hunt-scraper, property-value-estimator, quotes-scraper, reddit-scraper, shein-scraper, sitemap-generator, spotify-playlist-scraper, temu-scraper, transfermarkt-scraper, trustpilot-reviews-scraper, upwork-jobs, video-download-crawler, walmart-price-history, walmart-scraper, whitepages-scraper, yellow-pages-scraper, yelp-scraper, youtube-transcript-extractor Pass any parameters the tool accepts as a JSON object in the. It is categorised as a Execute tool in the Junipr MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Junipr MCP Server MCP server in PolicyLayer and add a rule for run_tool: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Junipr MCP Server. Nothing to install.
run_tool is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the run_tool rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for run_tool. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
run_tool is provided by the Junipr MCP Server MCP server (junipr-labs/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
run_tool is one line of Junipr MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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