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The MCP registry, with every server's tools checked
Every remote server the official MCP registry lists with a public endpoint, read the way an MCP client reads it and checked for tool poisoning. Each server is read again every week. We never call a tool.
26,226 servers listed. 6,905 read so far: 61% listed their tools to anyone (73,724 tools in all), 29% wanted credentials first, 11% could not be read. Our rules matched something on 5.
The index reads servers in the background, never-read first; 19321 are still in the queue.
| 8 random hex chars io.github.sadri-dridi/random-hex8 | 31 tools, nothing matched 2026-10-22 |
| Range bytes start-end shape, value discarded io.github.sadri-dridi/range-bytes | 31 tools, nothing matched 2026-10-22 |
| Range header shape io.github.sadri-dridi/range-ok | 31 tools, nothing matched 2026-10-22 |
| a/b ratio shape, numbers discarded io.github.sadri-dridi/ratio-ok | 31 tools, nothing matched 2026-10-22 |
| Rata Die day band io.github.sadri-dridi/rd-n | 31 tools, nothing matched 2026-10-22 |
| Rata Die integer band io.github.sadri-dridi/rdn-ok | 31 tools, nothing matched 2026-10-22 |
| X-Real-IP IPv4/IPv6 shape, value discarded io.github.sadri-dridi/real-ip | 31 tools, nothing matched 2026-10-22 |
| Redirect hop count band 0-5 io.github.sadri-dridi/redirect-hop-ok | 31 tools, nothing matched 2026-10-22 |
| Redis URL Shape io.github.sadri-dridi/redis-url-shape | 31 tools, nothing matched 2026-10-22 |
| Referrer-Policy token, value discarded io.github.sadri-dridi/referrer-ok | 31 tools, nothing matched 2026-10-22 |
| Refresh seconds;url shape, value discarded io.github.sadri-dridi/refresh-ok | 31 tools, nothing matched 2026-10-22 |
| Regex compile check, pattern discarded io.github.sadri-dridi/regex-ok | 31 tools, nothing matched 2026-10-22 |
| Register tons to cubic meters, number discarded io.github.sadri-dridi/register-t | 31 tools, nothing matched 2026-10-22 |
| Reiwa year from UTC io.github.sadri-dridi/reiwa-yr | 31 tools, nothing matched 2026-10-22 |
| yesterday/today/tomorrow from a UTC date io.github.sadri-dridi/relative-day-utc | 31 tools, nothing matched 2026-10-22 |
| Report-To group count, body discarded io.github.sadri-dridi/report-to | 31 tools, nothing matched 2026-10-22 |
| requirements.txt name count, versions discarded io.github.sadri-dridi/requirements-ok | 31 tools, nothing matched 2026-10-22 |
| resolv.conf nameserver count, body discarded io.github.sadri-dridi/resolv-ok | 31 tools, nothing matched 2026-10-22 |
| Retry-After integer-or-date, value discarded io.github.sadri-dridi/retry-ok | 31 tools, nothing matched 2026-10-22 |
| Whether an HTTP status is retryable io.github.sadri-dridi/retry-status-hint | 31 tools, nothing matched 2026-10-22 |
| encoded-word charset token, input discarded io.github.sadri-dridi/rfc2047-ok | 31 tools, nothing matched 2026-10-22 |
| RFC 3339 UTC stamp io.github.sadri-dridi/rfc3339-now | 31 tools, nothing matched 2026-10-22 |
| RFC 3986 unreserved charset, input discarded io.github.sadri-dridi/rfc3986-ok | 31 tools, nothing matched 2026-10-22 |
| RFC errata id shape, value discarded io.github.sadri-dridi/rfc-errata-ok | 31 tools, nothing matched 2026-10-22 |
| RFC number shape io.github.sadri-dridi/rfc-number-ok | 31 tools, nothing matched 2026-10-22 |
| RFC section number shape io.github.sadri-dridi/rfc-section-ok | 31 tools, nothing matched 2026-10-22 |
| HTTP status class 1xx-5xx io.github.sadri-dridi/rfc-status | 31 tools, nothing matched 2026-10-22 |
| RIPEMD-160 hex length, input discarded io.github.sadri-dridi/ripemd160 | 31 tools, nothing matched 2026-10-22 |
| RIPEMD hex length, input discarded io.github.sadri-dridi/ripemd-len | 31 tools, nothing matched 2026-10-22 |
| RIS tag count, body discarded io.github.sadri-dridi/ris-ok | 31 tools, nothing matched 2026-10-22 |
| Rison token charset, body discarded io.github.sadri-dridi/rison-ok | 31 tools, nothing matched 2026-10-22 |
| Rankine to kelvin, number discarded io.github.sadri-dridi/r-k | 31 tools, nothing matched 2026-10-22 |
| robots.txt Allow count, body discarded io.github.sadri-dridi/robots-allow-count | 31 tools, nothing matched 2026-10-22 |
| robots.txt group count io.github.sadri-dridi/robots-count | 31 tools, nothing matched 2026-10-22 |
| Robots Inspect io.github.sadri-dridi/robots-inspect | 31 tools, nothing matched 2026-10-22 |
| Rods to meters, number discarded io.github.sadri-dridi/rod-m | 31 tools, nothing matched 2026-10-22 |
| ROT13 encode, input discarded io.github.sadri-dridi/rot13-ok | 31 tools, nothing matched 2026-10-22 |
| ROT47 charset transform length, input discarded io.github.sadri-dridi/rot47-ok | 31 tools, nothing matched 2026-10-22 |
| ROT5 digit transform length, input discarded io.github.sadri-dridi/rot5-ok | 31 tools, nothing matched 2026-10-22 |
| Decimal-place count for a number io.github.sadri-dridi/round-dp | 31 tools, nothing matched 2026-10-22 |
| integer rowid band, value discarded io.github.sadri-dridi/rowid-int | 31 tools, nothing matched 2026-10-22 |
| SQLite rowid integer band, value discarded io.github.sadri-dridi/rowid-ok | 31 tools, nothing matched 2026-10-22 |
| RPM to hertz, number discarded io.github.sadri-dridi/rpm-hz | 31 tools, nothing matched 2026-10-22 |
| RPM to rad/s, number discarded io.github.sadri-dridi/rpm-rad | 31 tools, nothing matched 2026-10-22 |
| Revolutions per second to hertz, number discarded io.github.sadri-dridi/rps-hz | 31 tools, nothing matched 2026-10-22 |
| RSS feed shape, body discarded io.github.sadri-dridi/rss-ok | 31 tools, nothing matched 2026-10-22 |
| reStructuredText directive count, body discarded io.github.sadri-dridi/rst-ok | 31 tools, nothing matched 2026-10-22 |
| RTF header check, body discarded io.github.sadri-dridi/rtf-ok | 31 tools, nothing matched 2026-10-22 |
| Sass indent-rule count, body discarded io.github.sadri-dridi/sass-ok | 31 tools, nothing matched 2026-10-22 |
| SCREAMING_SNAKE charset, value discarded io.github.sadri-dridi/screaming-ok | 31 tools, nothing matched 2026-10-22 |
| HTML script tag count, markup discarded io.github.sadri-dridi/script-count | 30 tools, nothing matched 2026-10-22 |
| Scruples to grams, number discarded io.github.sadri-dridi/scruple-g | 31 tools, nothing matched 2026-10-22 |
| scrypt hex length, input discarded io.github.sadri-dridi/scrypt-len | 31 tools, nothing matched 2026-10-22 |
| scrypt N cost band, value discarded io.github.sadri-dridi/scrypt-n | 31 tools, nothing matched 2026-10-22 |
| SCSS rule count, body discarded io.github.sadri-dridi/scss-ok | 31 tools, nothing matched 2026-10-22 |
| SCSU window-tag count, input discarded io.github.sadri-dridi/scsu-ok | 31 tools, nothing matched 2026-10-22 |
| SCSU BOM presence, input discarded io.github.sadri-dridi/scsu-sig | 31 tools, nothing matched 2026-10-22 |
| sdbm hex, input discarded io.github.sadri-dridi/sdbm-ok | 31 tools, nothing matched 2026-10-22 |
| Search Query Length io.github.sadri-dridi/search-query-len | 31 tools, nothing matched 2026-10-22 |
| Whether UTC second can be 60 io.github.sadri-dridi/sec-leap | 31 tools, nothing matched 2026-10-22 |
| UTC second 0-60 band io.github.sadri-dridi/sec-ok | 31 tools, nothing matched 2026-10-22 |
| UTC second io.github.sadri-dridi/second-utc | 31 tools, nothing matched 2026-10-22 |
| Seconds to minutes io.github.sadri-dridi/sec-to-min | 31 tools, nothing matched 2026-10-22 |
| UTC second 0-60 band io.github.sadri-dridi/sec-utc | 31 tools, nothing matched 2026-10-22 |
| SEDOL 7-char charset, value discarded io.github.sadri-dridi/sedol-ok | 31 tools, nothing matched 2026-10-22 |
| semicolon-separated token count, value discarded io.github.sadri-dridi/semi-n | 31 tools, nothing matched 2026-10-22 |
| semicolon token count, value discarded io.github.sadri-dridi/semi-seg | 31 tools, nothing matched 2026-10-22 |
| SemVer shape io.github.sadri-dridi/semver-ok | 31 tools, nothing matched 2026-10-22 |
| SemVer numbers only io.github.sadri-dridi/semver-parse | 31 tools, nothing matched 2026-10-22 |
| SemVer range operators, value discarded io.github.sadri-dridi/semver-range-ok | 31 tools, nothing matched 2026-10-22 |
| sentence-terminator count, text discarded io.github.sadri-dridi/sent-n | 31 tools, nothing matched 2026-10-22 |
| Asia/Calcutta clock io.github.sadri-dridi/tz-asia-calcutta | 31 tools, nothing matched 2026-10-22 |
| Asia/Chita clock io.github.sadri-dridi/tz-asia-chita | 31 tools, nothing matched 2026-10-22 |
| Asia/Colombo clock io.github.sadri-dridi/tz-asia-colombo | 31 tools, nothing matched 2026-10-22 |
| Asia/Dhaka clock io.github.sadri-dridi/tz-asia-dhaka | 31 tools, nothing matched 2026-10-22 |
| Asia/Dili clock io.github.sadri-dridi/tz-asia-dili | 31 tools, nothing matched 2026-10-22 |
| Asia/Dubai clock io.github.sadri-dridi/tz-asia-dubai | 31 tools, nothing matched 2026-10-22 |
| Asia/Dushanbe clock io.github.sadri-dridi/tz-asia-dushanbe | 31 tools, nothing matched 2026-10-22 |
| Asia/Gaza clock io.github.sadri-dridi/tz-asia-gaza | 31 tools, nothing matched 2026-10-22 |
| Asia/Hebron clock io.github.sadri-dridi/tz-asia-hebron | 31 tools, nothing matched 2026-10-22 |
| Asia/Ho_Chi_Minh clock io.github.sadri-dridi/tz-asia-ho-chi-minh | 31 tools, nothing matched 2026-10-22 |
| Asia/Hong_Kong clock io.github.sadri-dridi/tz-asia-hong-kong | 31 tools, nothing matched 2026-10-22 |
| Asia/Irkutsk clock io.github.sadri-dridi/tz-asia-irkutsk | 31 tools, nothing matched 2026-10-22 |
| Asia/Jakarta clock io.github.sadri-dridi/tz-asia-jakarta | 31 tools, nothing matched 2026-10-22 |
| Asia/Jerusalem clock io.github.sadri-dridi/tz-asia-jerusalem | 31 tools, nothing matched 2026-10-22 |
| Asia/Kabul clock io.github.sadri-dridi/tz-asia-kabul | 31 tools, nothing matched 2026-10-22 |
| Asia/Kamchatka clock io.github.sadri-dridi/tz-asia-kamchatka | 31 tools, nothing matched 2026-10-22 |
| Asia/Karachi clock io.github.sadri-dridi/tz-asia-karachi | 31 tools, nothing matched 2026-10-22 |
| Asia/Kathmandu clock io.github.sadri-dridi/tz-asia-kathmandu | 31 tools, nothing matched 2026-10-22 |
| Asia/Kolkata clock io.github.sadri-dridi/tz-asia-kolkata | 31 tools, nothing matched 2026-10-22 |
| Asia/Kuala_Lumpur clock io.github.sadri-dridi/tz-asia-kuala-lumpur | 31 tools, nothing matched 2026-10-22 |
| Asia/Kuwait clock io.github.sadri-dridi/tz-asia-kuwait | 31 tools, nothing matched 2026-10-22 |
| Asia/Macau clock io.github.sadri-dridi/tz-asia-macau | 31 tools, nothing matched 2026-10-22 |
| Asia/Magadan clock io.github.sadri-dridi/tz-asia-magadan | 31 tools, nothing matched 2026-10-22 |
| Asia/Makassar clock io.github.sadri-dridi/tz-asia-makassar | 31 tools, nothing matched 2026-10-22 |
| Asia/Manila clock io.github.sadri-dridi/tz-asia-manila | 31 tools, nothing matched 2026-10-22 |
| Asia/Muscat clock io.github.sadri-dridi/tz-asia-muscat | 31 tools, nothing matched 2026-10-22 |
| Asia/Nicosia clock io.github.sadri-dridi/tz-asia-nicosia | 31 tools, nothing matched 2026-10-22 |
| Asia/Novosibirsk clock io.github.sadri-dridi/tz-asia-novosibirsk | 31 tools, nothing matched 2026-10-22 |
| Asia/Omsk clock io.github.sadri-dridi/tz-asia-omsk | 31 tools, nothing matched 2026-10-22 |
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