# DataNexus MCP MCP server

Agent View of the PolicyLayer registry record for DataNexus MCP: identity, probed posture, risk grade, and all 55 tools classified. HTML page: https://policylayer.com/tools/dev-7bd0-mcp-server

## Facts

- Server id: `dev-7bd0/mcp-server`
- Homepage: https://github.com/dev-7bd0/mcp-server
- Registry record: grade F, identity unverified
- Lifecycle: active
- Rate-limited: no
- Tools: 55 (55 with introspected schema)
- Tool categories present: Destructive, Read, Write
- Tags: dev 7bd0 mcp server, admin
- Record last modified: 2026-08-05T01:40:59.859Z

## Tools (55)

| Tool | Category | Risk | Record |
| --- | --- | --- | --- |
| `apikeys_revoke_api_key` | Destructive | Critical | https://policylayer.com/tools/dev-7bd0-mcp-server/apikeys-revoke-api-key.md |
| `apikeys_rotate_api_key` | Destructive | Critical | https://policylayer.com/tools/dev-7bd0-mcp-server/apikeys-rotate-api-key.md |
| `compliance_check_sam_exclusion` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/compliance-check-sam-exclusion.md |
| `compliance_fetch_finra_broker` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/compliance-fetch-finra-broker.md |
| `compliance_fetch_npi_provider` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/compliance-fetch-npi-provider.md |
| `compliance_search_npi_by_name` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/compliance-search-npi-by-name.md |
| `domain_check_email_security` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/domain-check-email-security.md |
| `domain_fetch_dns_records` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/domain-fetch-dns-records.md |
| `domain_fetch_domain_history` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/domain-fetch-domain-history.md |
| `domain_fetch_domain_rdap` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/domain-fetch-domain-rdap.md |
| `domain_fetch_reverse_ip` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/domain-fetch-reverse-ip.md |
| `domain_fetch_ssl_certificate_chain` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/domain-fetch-ssl-certificate-chain.md |
| `domain_fetch_subdomains` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/domain-fetch-subdomains.md |
| `frontend_security_audit_ci_pipeline` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/frontend-security-audit-ci-pipeline.md |
| `frontend_security_audit_manifest` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/frontend-security-audit-manifest.md |
| `frontend_security_detect_typosquatting` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/frontend-security-detect-typosquatting.md |
| `frontend_security_fetch_package_risk_brief` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/frontend-security-fetch-package-risk-brief.md |
| `govcon_fetch_open_solicitations` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/govcon-fetch-open-solicitations.md |
| `govcon_fetch_vendor_contract_history` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/govcon-fetch-vendor-contract-history.md |
| `govcon_search_contract_awards` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/govcon-search-contract-awards.md |
| `legal_fetch_inventor_portfolio` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/legal-fetch-inventor-portfolio.md |
| `legal_fetch_patent_by_number` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/legal-fetch-patent-by-number.md |
| `legal_fetch_patent_citations` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/legal-fetch-patent-citations.md |
| `legal_search_patents_by_keyword` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/legal-search-patents-by-keyword.md |
| `nonprofit_fetch_charity_uk` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/nonprofit-fetch-charity-uk.md |
| `nonprofit_fetch_nonprofit_by_ein` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/nonprofit-fetch-nonprofit-by-ein.md |
| `nonprofit_fetch_nonprofit_financial_trends` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/nonprofit-fetch-nonprofit-financial-trends.md |
| `nonprofit_fetch_nonprofit_full_profile` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/nonprofit-fetch-nonprofit-full-profile.md |
| `nonprofit_search_nonprofits_by_category` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/nonprofit-search-nonprofits-by-category.md |
| `nonprofit_search_nonprofits_by_name` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/nonprofit-search-nonprofits-by-name.md |
| `regulatory_fetch_docket_details` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/regulatory-fetch-docket-details.md |
| `regulatory_fetch_federal_register_notices` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/regulatory-fetch-federal-register-notices.md |
| `regulatory_search_open_rulemakings` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/regulatory-search-open-rulemakings.md |
| `report_mcpize_link` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/report-mcpize-link.md |
| `search_datanexus_tools` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/search-datanexus-tools.md |
| `security_audit_licence_compatibility` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-audit-licence-compatibility.md |
| `security_audit_sbom_continuous` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-audit-sbom-continuous.md |
| `security_audit_sbom_license_policy` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-audit-sbom-license-policy.md |
| `security_audit_sbom_vulnerabilities` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-audit-sbom-vulnerabilities.md |
| `security_detect_typosquatting` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-detect-typosquatting.md |
| `security_fetch_cisa_kev` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-cisa-kev.md |
| `security_fetch_cve_detail` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-cve-detail.md |
| `security_fetch_cve_epss` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-cve-epss.md |
| `security_fetch_cve_risk_summary` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-cve-risk-summary.md |
| `security_fetch_cve_watch` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-cve-watch.md |
| `security_fetch_cve_watch_status` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-cve-watch-status.md |
| `security_fetch_dependency_graph` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-dependency-graph.md |
| `security_fetch_licence_analysis` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-licence-analysis.md |
| `security_fetch_package_licence` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-package-licence.md |
| `security_fetch_package_maintainer_history` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-package-maintainer-history.md |
| `security_fetch_package_risk_brief` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-package-risk-brief.md |
| `security_fetch_package_vulnerabilities` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/security-fetch-package-vulnerabilities.md |
| `validate_tool_output` | Read | Low | https://policylayer.com/tools/dev-7bd0-mcp-server/validate-tool-output.md |
| `apikeys_generate_api_key` | Write | Medium | https://policylayer.com/tools/dev-7bd0-mcp-server/apikeys-generate-api-key.md |
| `report_feedback` | Write | Medium | https://policylayer.com/tools/dev-7bd0-mcp-server/report-feedback.md |

## Tool descriptions

- `apikeys_revoke_api_key` — ⚠️ DESTRUCTIVE — requires human confirmation before use in automated pipelines. Permanently revoke a DataNexus API key. The key will stop working immediately. This action cannot be undone — generate a new key if access is needed again.
- `apikeys_rotate_api_key` — ⚠️ DESTRUCTIVE — requires human confirmation before use in automated pipelines. Revoke the current API key and issue a replacement. Returns the new key once — store it immediately. Pass keys as the X-DataNexus-Key header.
- `compliance_check_sam_exclusion` — Check whether an entity is on the US federal exclusions list (debarred from government contracts). Read-only. No side effects. Idempotent. US only. name_or_ein: Entity name or 9-digit EIN with or without dash e.g. Acme Corp or 13-1234567…
- `compliance_fetch_finra_broker` — Fetch FINRA BrokerCheck registration for a US broker or investment adviser by CRD number. Read-only. No side effects. Idempotent. US only. crd_number: Central Registration Depository number as a string of digits e.g. 1234567. Required. C…
- `compliance_fetch_npi_provider` — Fetch NPI registration details for a US healthcare provider by NPI number. Read-only. No side effects. Idempotent. US only. npi_number: 10-digit NPI number e.g. 1003000126. Required. Do not include dashes or spaces. Returns provider name…
- `compliance_search_npi_by_name` — Search the NPPES NPI Registry by provider name with optional state and speciality filters. Read-only. No side effects. Idempotent. US only. Returns up to 10 matches. name: Full or partial provider name. Required. state: Two-letter US sta…
- `domain_check_email_security` — Check SPF, DMARC, and DKIM email authentication for a domain. domain: Domain without protocol e.g. "google.com". Returns: overall_grade (A–F), spf_score, dmarc_score, dkim_score (each 0–10), spf_record, dmarc_record, dkim_selectors_found…
- `domain_fetch_dns_records` — Fetch current DNS records for a domain via Cloudflare DNS over HTTPS. Read-only. No side effects. Idempotent. domain: Domain name without protocol e.g. cloudflare.com. Required. record_types: List of DNS record types to fetch. Required. …
- `domain_fetch_domain_history` — Fetch historical SSL certificate issuance for a domain from Certificate Transparency logs. Read-only. No side effects. Idempotent. domain: Domain name without protocol e.g. example.com. Required. Returns all past certificates with issuer…
- `domain_fetch_domain_rdap` — Fetch domain registration details via IANA RDAP (the modern structured replacement for WHOIS). Read-only. No side effects. Idempotent. domain: Domain name without protocol e.g. example.com not https://example.com. Required. Returns regis…
- `domain_fetch_reverse_ip` — Find domains co-hosted on the same IP address (reverse IP lookup). Read-only. No side effects. Idempotent. domain_or_ip: Domain name (e.g. shared.dreamhost.com) or IPv4 address (e.g. 1.2.3.4). Required. If a domain is given, it is first …
- `domain_fetch_ssl_certificate_chain` — Fetch SSL certificate history for a domain from Certificate Transparency logs. Read-only. No side effects. Idempotent. domain: Domain name without protocol e.g. github.com. Required. Does not support IP addresses or wildcard domains. Ret…
- `domain_fetch_subdomains` — Enumerate subdomains for a domain via Certificate Transparency logs. Read-only. No side effects. Idempotent. domain: Domain name without protocol e.g. anthropic.com. Required. Returns deduplicated list of known subdomains. Primary source…
- `frontend_security_audit_ci_pipeline` — Scan GitHub Actions, Vercel, or Netlify CI configs for exposed secrets, missing lockfile enforcement, and unpinned dependencies. Paste your config content — no filesystem access required. config: Raw YAML/TOML content of your CI config. …
- `frontend_security_audit_manifest` — Audit a frontend package.json for security risks — returns a single SHIP/CAUTION/BLOCK verdict with licence risks and abandonment signals. Different from security_fetch_package_vulnerabilities which audits a single package — this takes y…
- `frontend_security_detect_typosquatting` — Typosquatting detection optimised for the top 500 frontend packages (React, Vite, Axios, Lodash, etc.). Fewer false positives than a full npm scan. For backend packages, use security_detect_typosquatting instead. package_name: Package na…
- `frontend_security_fetch_package_risk_brief` — SHIP/CAUTION/BLOCK risk brief for an npm package with frontend-specific context. Wraps security_fetch_package_risk_brief restricted to npm, and adds weekly_downloads and is_ui_component signals. package_name: npm package name. Required. …
- `govcon_fetch_open_solicitations` — Fetch currently open government contract solicitations matching a keyword. Read-only. No side effects. Idempotent. keyword: Description of goods or services sought e.g. cloud computing services. Required. Encode special characters — + be…
- `govcon_fetch_vendor_contract_history` — Fetch the complete federal contract award history for a specific vendor. Read-only. No side effects. Idempotent. vendor_name: Company or organisation name e.g. Booz Allen Hamilton. Required. Fuzzy match used. jurisdiction: One of US, EU,…
- `govcon_search_contract_awards` — Search government contract awards by keyword, agency, and date range. keyword: Contract scope e.g. "cybersecurity software". agency: Awarding agency e.g. "Department of Defense". Optional. date_from: Earliest award date ISO 8601 e.g. "20…
- `legal_fetch_inventor_portfolio` — Fetch the patent portfolio for a named inventor with optional assignee filter. Read-only. No side effects. Idempotent. inventor_name: Inventor surname or full name e.g. Smith or John Smith. Required. Fuzzy match — common names may return…
- `legal_fetch_patent_by_number` — Fetch full patent details by patent number and jurisdiction. Read-only. No side effects. Idempotent. patent_number: Patent number in EPODOC format e.g. EP1000000 for European, CN120586032 for Chinese, JP2020123456 for Japanese, WO2020123…
- `legal_fetch_patent_citations` — Fetch forward and backward citation chains for a specific patent. Read-only. No side effects. Idempotent. patent_number: Patent number in EPODOC format e.g. EP1000000 for European, CN120586032 for Chinese, JP2020123456 for Japanese, WO20…
- `legal_search_patents_by_keyword` — Search patents by keyword across EPO, USPTO, or WIPO. Read-only. No side effects. Idempotent. Returns up to 10 matches. keywords: Search terms describing the invention e.g. neural network image classification. Required. jurisdiction: One…
- `nonprofit_fetch_charity_uk` — Fetch UK registered charity details by charity number or organisation name. Read-only. No side effects. Idempotent. UK only. charity_number_or_name: UK registered charity number (7 digits, e.g. 1234567) or full/partial organisation name.…
- `nonprofit_fetch_nonprofit_by_ein` — Fetch IRS 990 filing data for any US nonprofit by EIN. Read-only. No side effects. Idempotent. US only. ein: 9-digit Employer ID with or without dash, e.g. 46-5734087 or 465734087. Required. Returns name, revenue, expenses, assets, NTEE …
- `nonprofit_fetch_nonprofit_financial_trends` — 5-year financial trend for any US nonprofit. Revenue growth, expense ratios, reserve trajectory, and health score history from IRS Form 990 data via ProPublica. Returns trend_direction (GROWING/STABLE/DECLINING/VOLATILE/INSUFFICIENT_DATA…
- `nonprofit_fetch_nonprofit_full_profile` — Complete nonprofit due diligence in one call. Revenue trends, executive pay, risk flags, and a health score from IRS 990 data. Uses ProPublica Nonprofit Explorer API with IRS e-File fallback. Data refreshed on each call. Returns financia…
- `nonprofit_search_nonprofits_by_category` — Search US nonprofits by mission category and state. Returns up to 25 results with revenue, assets, and health scores (0–100). Category maps to NTEE codes: education, healthcare, arts, environment, human_services, civil_rights, internatio…
- `nonprofit_search_nonprofits_by_name` — Search US nonprofits by name with optional state filter. Read-only. No side effects. Idempotent. US only. Returns up to 25 matches. name: Full or partial organisation name. Required. state: Two-letter US state code e.g. CA, NY. Optional,…
- `regulatory_fetch_docket_details` — Fetch full details for a specific regulatory docket by ID. Read-only. No side effects. Idempotent. US federal only. docket_id: Docket identifier in agency format e.g. EPA-HQ-OAR-2021-0317 or FTC-2024-0041. Required. Timeout is 30 seconds…
- `regulatory_fetch_federal_register_notices` — Fetch recent Federal Register notices and rules for a specific agency. Read-only. No side effects. Idempotent. US federal only. agency: Agency name or abbreviation e.g. SEC, Food and Drug Administration, EPA. Required. keyword: Optional …
- `regulatory_search_open_rulemakings` — Search open rulemakings and public comment periods on Regulations.gov and the Federal Register. Read-only. No side effects. Idempotent. US federal only. keyword: Topic keywords e.g. artificial intelligence, data privacy. Required. agency…
- `report_mcpize_link` — Check MCPize subscription status for a DataNexus tool. tool_id: DataNexus tool identifier e.g. "T10". Pass the tool the user is asking about. Returns: status ("free" | "subscription_required" | "not_configured"), message, tool_id, and up…
- `search_datanexus_tools` — Find the right DataNexus tool by describing your task in plain English. Read-only. No side effects. Call this before any other DataNexus tool to reduce context load from 40000 to 800 tokens. query: Plain English description of your task …
- `security_audit_licence_compatibility` — Audit the licence compatibility of your entire dependency list. Input package names (with ecosystem) or SPDX IDs; get a COMPATIBLE/CONFLICT verdict with specific conflicting pairs and recommended action. Uses static SPDX compatibility ta…
- `security_audit_sbom_continuous` — Persistent SBOM watch. Register once, check anytime for new CVEs affecting your dependency snapshot. Silent permanent watch — CycloneDX and SPDX supported. Uses OSV.dev for vulnerability lookup, Redis for persistence with 90-day TTL. Sup…
- `security_audit_sbom_license_policy` — Audit a CycloneDX or SPDX SBOM against an SPDX licence policy and return a PASS/WARN/BLOCK verdict. sbom: Full SBOM as a JSON string — CycloneDX or SPDX format. Required. 500 KB max. policy: Optional dict with block/warn/allow arrays of …
- `security_audit_sbom_vulnerabilities` — Audit a Software Bill of Materials for known vulnerabilities across all listed packages. Read-only. No side effects. Idempotent. sbom_json: CycloneDX or SPDX SBOM as a JSON string. Required. Large SBOMs (100+ packages) may take up to 10 …
- `security_detect_typosquatting` — Detect typosquatting attacks against a package name. Compares using Damerau-Levenshtein distance ≤ 2 against top-10,000 packages. Returns similar_packages with anomaly scores, and a SUSPICIOUS or CLEAN verdict. Uses PyPI and npm download…
- `security_fetch_cisa_kev` — Check whether a CVE is in the CISA Known Exploited Vulnerabilities (KEV) catalog. Read-only. No side effects. Idempotent. cve_id: CVE identifier in format CVE-YYYY-NNNNN e.g. CVE-2021-44228. Required. Returns in_kev (bool), date_added, d…
- `security_fetch_cve_detail` — Fetch full detail for a specific CVE by ID. Read-only. No side effects. Idempotent. cve_id: CVE identifier in format CVE-YYYY-NNNNN e.g. CVE-2021-44228. Required. Returns description, CVSS base score, affected products, patch references,…
- `security_fetch_cve_epss` — EPSS exploit probability score for a CVE — predicts likelihood of exploitation in the next 30 days. cve_id: CVE identifier e.g. "CVE-2021-44228". Returns: epss (float 0.0–1.0) and percentile (float 0.0–100.0). Thresholds: >0.7 patch imme…
- `security_fetch_cve_risk_summary` — Instant CVE risk verdict. Combines CVSS severity, CISA KEV exploitation status, and EPSS probability in one parallel call. Returns CRITICAL_EXPLOIT, HIGH_RISK, MODERATE, LOW, or UNKNOWN verdict with patch availability from vendor advisor…
- `security_fetch_cve_watch` — Persistent CVE watchlist. Create once, check anytime for new events since your last visit — patch releases, KEV listings, PoC publications, exploitation detected. Uses Redis for persistence, NVD + CISA KEV + EPSS for daily background ref…
- `security_fetch_cve_watch_status` — Check all specified CVE watches for new events since your last poll. Returns only watches with new events, making it efficient to run on a schedule. watch_ids: List of watch IDs to check — same IDs used when creating watches with securit…
- `security_fetch_dependency_graph` — Fetch the full dependency tree for a package version including transitive dependencies. Read-only. No side effects. Idempotent. Hard 8-second timeout — large dependency trees may return partial results. package: Package name. Required. v…
- `security_fetch_licence_analysis` — Understand any software licence in plain English. Returns obligations, permissions, limitations, risk level, and OSI/FSF status for any SPDX licence identifier. Static bundle covers top-50 common licences (no network call). Falls back to…
- `security_fetch_package_licence` — Fetch the SPDX licence identifier for an open source package version. Read-only. No side effects. Idempotent. package: Package name e.g. flask. Required. version: Exact version string e.g. 2.3.0. Required. ecosystem: One of PyPI, npm, Ma…
- `security_fetch_package_maintainer_history` — Analyse ownership and release history for an npm or PyPI package to detect supply-chain risk. Uses PyPI JSON API and npm registry — data refreshed on each call, 1-hour cache. Returns maintainer_count, recent_changes, ownership_transfers,…
- `security_fetch_package_risk_brief` — Single SHIP/CAUTION/BLOCK verdict for any package. Combines CVEs, licence, maintainer health, and transitive count in one call. Uses OSV.dev, deps.dev, PyPI, and npm registry — data refreshed on each call. Returns verdict (SHIP/CAUTION/B…
- `security_fetch_package_vulnerabilities` — Fetch all known CVEs for an open source package version or a batch of packages. Read-only. No side effects. Idempotent. Single-package mode: package (e.g. requests), version (e.g. 2.28.0), ecosystem (PyPI/npm/Maven/Go/Cargo/NuGet/RubyGem…
- `validate_tool_output` — Validate a DataNexus tool response for data quality issues using two-layer validation: deterministic rules first, then AI review for ambiguous cases. Read-only. Never blocks. tool_id: DataNexus tool identifier e.g. T04, T10, T22. Require…
- `apikeys_generate_api_key` — Generate a DataNexus API key for the given email address. All users get 10 free lookups per week — registered users will be notified first when paid tiers with higher limits launch. Store the returned key — it is shown only once. Pass it…
- `report_feedback` — Report a data quality issue or agent intent gap for a DataNexus tool response. tool_id: e.g. "T10" or "security_fetch_cve_detail". query_hash: From the query_hash field of the response. signal: incorrect_data | missing_field | stale_data…

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=dev-7bd0-mcp-server · API: https://policylayer.com/registry/api · Recommended policies for every tool: https://policylayer.com/policies/dev-7bd0-mcp-server