Stackhal
REMOTE · STACKHAL.COM
Outside-in DNS, email security, SEO, GEO and app-link checks plus developer utilities.
Available components
Last scanned (21 hours ago)
Scores higher than 94% of remote servers
Reachable. Last reached 4 Nov 2026.
Category Marketing and SEO
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security77
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC is configured correctly; the domain's records validate against the full chain to the root. View diagnostics → Pass
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability77
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 1673 tokens (~128/item across 13 items; 13 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 13 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 14 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 4 Nov 26 +1
- Stability: 0.97 → pass security
- 2 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 90 to 93. That category is still filling its 30-day observation window: 27 days of observed history at the previous scan, 28 at this one. The score rises as the window fills, whether or not the server changes.
- 31 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.
- 29 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.
- 27 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.
- 25 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.
- 22 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.
- 20 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 4 Nov 2026 · Probed https://stackhal.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=stackhal.com | CN=YE1,O=Let's Encrypt,C=US | 22 Oct 2026 | 20 Jan 2027 | ECDSA 256 | ECDSA-SHA384 | 62b18f7201d97e9a814480ee87afcd3201e |
| SANs: stackhal.com | ||||||
| CN=YE1,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 5ddd70dd31f801c85c186a7a04b80afe |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC secure
Validation of stackhal.com. — Secure
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| stackhal.com. | present | 33329 | 8 | Verified |
| stackhal.com. | Verified address RRset verified with the apex keys |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | camera=(), microphone=(), geolocation=() |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://stackhal.com/mcp | Verified | 200 | |
| http (plaintext) | http://stackhal.com/mcp | HTTPS enforced | 301 | https://stackhal.com/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
analyze_geo_readiness Analyze GEO Readiness ~63
Analyze Generative Engine Optimization (GEO) signals and AI crawler readiness for a web page (schema, citations, provenance, answer structure, llms.txt, AI bot robots rules).
| Name | Type | Req | Description |
|---|---|---|---|
| url | string | yes | The web page URL to analyze for GEO readiness. |
No output schema declared.
No examples provided.
audit_website_seo Technical SEO Audit ~69
Run a deterministic technical SEO audit for a public website URL. Checks canonicals, title tags, headings, robots.txt, sitemaps, redirects, crawl traps, and indexability.
| Name | Type | Req | Description |
|---|---|---|---|
| url | string | yes | The public website URL to audit (e.g. https://example.com). |
No output schema declared.
No examples provided.
calculate_cidr_overlap Calculate CIDR Overlap ~136
Analyze IPv4/IPv6 CIDR subnets for range collisions, full containment, 2D bit-tree matrix partition, and available free subnet allocation.
| Name | Type | Req | Description |
|---|---|---|---|
| cidrs | array | yes | Array of IPv4 or IPv6 CIDR strings to analyze for collisions and tree partition. |
| parent_cidr | null|string | – | Optional parent CIDR string (e.g. 10.0.0.0/16) to constrain free subnet allocation search. |
| requested_free_prefix | null|integer | – | Optional target prefix length (e.g. 20, 24) to find available free subnet block inside parent range. |
No output schema declared.
No examples provided.
diagnose_cors_policy Diagnose CORS Policy ~111
Analyze CORS HTTP request and response headers for wildcard/credential security violations, missing Vary: Origin, preflight OPTIONS handling, and header exposure.
| Name | Type | Req | Description |
|---|---|---|---|
| request_origin | string | yes | The incoming HTTP request Origin header (e.g. "https://app.example.com"). |
| response_headers | array | yes | The server HTTP response headers (as key-value map or list of "Header: Value" strings). |
| with_credentials | null|boolean | – | Whether the cross-origin request includes cookies or authorization credentials. |
No output schema declared.
No examples provided.
generate_apple_pkpass_spec Generate Apple Wallet pass.json ~405
Generate a production-ready, fully compliant Apple Wallet pass.json specification based on pass type, metadata, colors, barcode, and field values.
| Name | Type | Req | Description |
|---|---|---|---|
| background_color | null|string | – | Background color as CSS rgb(r, g, b), e.g. "rgb(15, 23, 42)". |
| barcode_format | null|string | – | Barcode format: "PKBarcodeFormatQR", "PKBarcodeFormatPDF417", "PKBarcodeFormatAztec", "PKBarcodeFormatCode128". |
| barcode_message | null|string | – | Barcode message payload, e.g. "M1HAL/BAHDAN ELO027". |
| description | string | yes | Human-readable description of the pass, e.g. "Flight from SFO to WAW". |
| foreground_color | null|string | – | Foreground text color as CSS rgb(r, g, b), e.g. "rgb(255, 255, 255)". |
| label_color | null|string | – | Label text color as CSS rgb(r, g, b), e.g. "rgb(148, 163, 184)". |
| organization_name | string | yes | Name of the pass issuing organization, e.g. "Acme Airlines". |
| pass_type | string | yes | Pass style type: "boardingPass", "eventTicket", "storeCard", "coupon", or "generic". |
| pass_type_identifier | null|string | – | Apple Pass Type Identifier starting with "pass.", e.g. "pass.com.example.ticket". |
| serial_number | null|string | – | Unique pass serial number, e.g. "LOT-89421". |
| team_identifier | null|string | – | Apple Developer 10-character Team ID, e.g. "BAHDAN9988". |
| transit_type | null|string | – | Transit type for boardingPass: "PKTransitTypeAir", "PKTransitTypeTrain", "PKTransitTypeBus", "PKTransitTypeBoat", "PKTransitTypeGeneric". |
No output schema declared.
No examples provided.
generate_favicon_suite Generate Favicon Suite ~104
Generate modern multi-platform favicon bundle (adaptive dark-mode SVG, multi-resolution ICO, Apple Touch Icon, Android PWA icons, webmanifest) and minimal HTML tags from SVG or image input.
| Name | Type | Req | Description |
|---|---|---|---|
| dark_mode_strategy | null|string | – | Optional dark mode strategy: "css_invert_fill" (default), "css_class_swap", or "preserve_colors". |
| svg_content | string | yes | The raw SVG XML markup string to convert into modern multi-platform favicon suite. |
No output schema declared.
No examples provided.
inspect_apple_pkpass Inspect Apple Wallet Pass ~73
Inspect and validate Apple Wallet .pkpass JSON structure (pass.json) or package manifests: checks required keys, pass styles, dates, ISO 8601 timezones, transit types, barcodes, and color contrast.
| Name | Type | Req | Description |
|---|---|---|---|
| pass_json | string | yes | The raw pass.json JSON string to inspect and validate. |
No output schema declared.
No examples provided.
inspect_domain_security Inspect Domain Email Security ~80
Inspect domain email security and deliverability standards: DMARC (BIMI compliance), BIMI DNS & SVG reachability, MTA-STS (RFC 8461), SMTP TLS-RPT (RFC 8460), SPF and MX records.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | The domain name to inspect (e.g. stripe.com, example.com). |
No output schema declared.
No examples provided.
repair_apple_pkpass_spec Repair Apple Wallet pass.json ~78
Automatically repair and sanitize broken Apple Wallet pass.json manifests: fixes missing formatVersion, prefixes passTypeIdentifier, ensures 10-character team ID, normalizes dates to ISO 8601 with timezones, and auto-corrects low contrast.
| Name | Type | Req | Description |
|---|---|---|---|
| pass_json | string | yes | The raw, broken pass.json JSON string to repair. |
No output schema declared.
No examples provided.
trace_dns_delegation Trace DNS Delegation ~95
Query live DNS records and inspect the authoritative nameservers returned for a domain.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | The target domain name (e.g. "example.com") to query using the application host resolver. |
| query_type | null|string | – | Optional DNS record type: "A" (default), "AAAA", "CNAME", "TXT", "MX", "NS", "SOA", or "CAA". |
No output schema declared.
No examples provided.
transpile_regex_engine Convert Regex Between Engines ~128
Transpile and analyze regular expressions across engines (PCRE, Go RE2, JavaScript, Python re, Rust regex) with compatibility checks and ReDoS safety analysis.
| Name | Type | Req | Description |
|---|---|---|---|
| pattern | string | yes | The regular expression pattern string to analyze and transpile. |
| source_engine | null|string | – | Optional source engine: "pcre" (default), "go_re2", "javascript", "python", "rust". |
| target_engine | null|string | – | Optional target engine: "go_re2" (default), "pcre", "javascript", "python", "rust". |
No output schema declared.
No examples provided.
transpile_to_caddyfile Convert Nginx or Apache Config to Caddyfile ~114
Transpile Nginx (nginx.conf, server blocks) or Apache (.htaccess, VirtualHost) web server configuration to clean, idiomatic Caddyfile with migration advisories.
| Name | Type | Req | Description |
|---|---|---|---|
| config_content | string | yes | The raw web server configuration string (nginx.conf, server block, .htaccess, or VirtualHost) to transpile. |
| server_type | null|string | – | Optional source server type: "nginx" or "apache". If omitted, auto-detected from content syntax. |
No output schema declared.
No examples provided.
validate_app_links Validate Universal Links and App Links ~108
Inspect and validate Apple App Site Association (apple-app-site-association) and Android Digital Asset Links (assetlinks.json) files, HTTPS hosting rules, and test URL path routing, and compare the origin AASA with the copy on Apple's CDN.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | The target domain name (e.g. "example.com") hosting universal link and asset link files. |
| test_url | null|string | – | Optional web URL path to test against Apple AASA components and exclusion routing patterns. |
No output schema declared.
No examples provided.
How do I install the Stackhal MCP server?
Stackhal is a hosted endpoint at https://stackhal.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · stackhal.com
claude mcp add --transport http bahdanhal-stackhal 'https://stackhal.com/mcp'
What is the Stackhal MCP server?
Stackhal is an MCP server listed in the public MCP registry as io.github.bahdanhal/stackhal. Outside-in DNS, email security, SEO, GEO and app-link checks plus developer utilities. This page covers its hosted endpoint (https://stackhal.com/mcp).
Is the Stackhal MCP server safe to use?
Stackhal scores 87 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Stackhal MCP server expose?
Stackhal exposes 13 tools: validate_app_links, audit_website_seo, transpile_to_caddyfile, calculate_cidr_overlap, diagnose_cors_policy, and 8 more. Their descriptions and schemas cost roughly 1,564 tokens of context every time the server is loaded.
Does the Stackhal MCP server require authentication?
No. We connected to Stackhal without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Stackhal MCP server still maintained?
Stackhal is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.