# MISSING (remote · missing-production-e3da.up.railway.app)

Fallback capability resolver for AI agents with replay-verified discovery and x402 paid execution.

- Trust score: 69/100 (medium)
- Change this week: +2
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `missing-production-e3da.up.railway.app`: 69/100 (this document), [markdown](https://verifymcp.io/servers/leoleon506-missing/missing-production-e3da.md), [page](https://verifymcp.io/servers/leoleon506-missing/missing-production-e3da)

## Channel facts

- Endpoint: `https://missing-production-e3da.up.railway.app/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.2.0`

## Trust breakdown

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. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-20.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 22 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 70/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 3707 tokens (~161/item across 23 items; 23 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 37/100
  - Stability observed for 11 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 23 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 23 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the MISSING MCP server?

MISSING is a hosted endpoint at https://missing-production-e3da.up.railway.app/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.

### Claude

```bash
claude mcp add --transport http leoleon506-missing 'https://missing-production-e3da.up.railway.app/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "leoleon506-missing": {
      "url": "https://missing-production-e3da.up.railway.app/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "leoleon506-missing": {
      "type": "http",
      "url": "https://missing-production-e3da.up.railway.app/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.leoleon506-missing]
url = "https://missing-production-e3da.up.railway.app/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "leoleon506-missing": {
      "type": "remote",
      "url": "https://missing-production-e3da.up.railway.app/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add leoleon506-missing --url 'https://missing-production-e3da.up.railway.app/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  leoleon506-missing:
    url: "https://missing-production-e3da.up.railway.app/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "leoleon506-missing": {
      "Transport": "http",
      "Url": "https://missing-production-e3da.up.railway.app/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add leoleon506-missing -t streamable-http -u 'https://missing-production-e3da.up.railway.app/mcp'
```

### Other

```json
{
  "mcpServers": {
    "leoleon506-missing": {
      "type": "http",
      "url": "https://missing-production-e3da.up.railway.app/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-20 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-18 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-16 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 66, −1)

- [security] Tool “list_verified_capabilities” rewrote its description, which is the text the model reads
- [security] Tool “record_missing_capability_demand” rewrote its description, which is the text the model reads
- [security] Tool “resolve_capability” rewrote its description, which is the text the model reads
- [security] Tool “search_verified_capabilities” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 615 → 3707
- [functional] New tool “reverse_geocoding_postal_code”
- [functional] New tool “canadian_holiday_metadata_by_id”
- [functional] New tool “canadian_holidays_by_year”
- [functional] New tool “chess_player_metadata”
- [functional] New tool “country_alpha_metadata”
- [functional] New tool “currency_exchange_rate”
- [functional] New tool “dns_record_lookup”
- [functional] New tool “domain_rdap_metadata”
- [functional] New tool “get_canadian_province_holidays_by_province_abbreviation_capability”
- [functional] New tool “github_repository_metadata”
- [functional] New tool “github_user_metadata”
- [functional] New tool “ip_geolocation_metadata”
- [functional] New tool “npm_package_metadata”
- [functional] New tool “nuget_package_versions”
- [functional] New tool “pokemon_name_metadata”
- [functional] New tool “postal_code_location_metadata”
- [functional] New tool “pypi_package_metadata”
- [functional] New tool “satellite_catalog_metadata”
- [functional] New tool “television_show_metadata”
- [cosmetic] “resolve_capability” reworded the description of “input”
- [cosmetic] “search_verified_capabilities” reworded the description of “limit”
- [cosmetic] “search_verified_capabilities” reworded the description of “query”
- [cosmetic] Tool “record_missing_capability_demand” changed its title: Record Missing Capability Demand → Request a New Capability
- [cosmetic] Tool “search_verified_capabilities” changed its title: Search Verified Capabilities → Search or Request a Capability

### 2026-09-13 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-11 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-10 (score 65, +5)

- [security] Tool “list_verified_capabilities” rewrote its description, which is the text the model reads
- [security] Tool “record_missing_capability_demand” rewrote its description, which is the text the model reads
- [security] Tool “resolve_capability” rewrote its description, which is the text the model reads
- [security] Tool “search_verified_capabilities” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: pass → fail
- [functional improvement] Tool coverage: 0% → 100%
- [functional improvement] Stability: unverified → 0.03
- [functional] Schema quality: good → excellent
- [cosmetic] “record_missing_capability_demand” reworded the description of “capability”
- [cosmetic] “record_missing_capability_demand” reworded the description of “example_input”
- [cosmetic] “record_missing_capability_demand” reworded the description of “intent”
- [cosmetic] “resolve_capability” reworded the description of “capability”
- [cosmetic] “resolve_capability” reworded the description of “input”
- [cosmetic] “search_verified_capabilities” reworded the description of “limit”
- [cosmetic] “search_verified_capabilities” reworded the description of “query”
- [cosmetic] Tool “list_verified_capabilities” changed its title: List Verified Capabilities
- [cosmetic] Tool “record_missing_capability_demand” changed its title: Record Missing Capability Demand
- [cosmetic] Tool “resolve_capability” changed its title: Resolve Verified Capability
- [cosmetic] Tool “search_verified_capabilities” changed its title: Search Verified Capabilities

### 2026-09-09 (score 60)

First indexed and scored.

## MCP tools (23)

### `canadian_holiday_metadata_by_id` (~172 tokens)

Canadian Holiday Metadata By Id

Use this direct MISSING tool to resolve the verified MISSING capability canadian_holiday_metadata_by_id. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `holidayId` (number, required): Required input field 'holidayId'. Example: 1.
- `year` (number, required): Required input field 'year'. Example: 2026.

### `canadian_holidays_by_year` (~151 tokens)

Canadian Holidays By Year

Use this direct MISSING tool to resolve the verified MISSING capability canadian_holidays_by_year. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `year` (number, required): Required input field 'year'. Example: 2026.

### `chess_player_metadata` (~147 tokens)

Chess Player Metadata

Use this direct MISSING tool to look up public Chess.com player metadata by username. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `username` (string, required): Required input field 'username'. Example: "hikaru".

### `country_alpha_metadata` (~151 tokens)

Country Alpha Metadata

Use this direct MISSING tool to look up a country's name and region from its alpha country code. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `country_code` (string, required): Required input field 'country_code'. Example: "JP".

### `currency_exchange_rate` (~167 tokens)

Currency Exchange Rate

Use this direct MISSING tool to look up the current exchange rate between two currencies. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `base_currency` (string, required): Required input field 'base_currency'. Example: "usd".
- `quote_currency` (string, required): Required input field 'quote_currency'. Example: "eur".

### `dns_record_lookup` (~166 tokens)

Dns Record Lookup

Use this direct MISSING tool to look up public DNS records for a hostname and record type. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `name` (string, required): Required input field 'name'. Example: "example.com".
- `type` (string, required): Required input field 'type'. Example: "A".

### `domain_rdap_metadata` (~149 tokens)

Domain Rdap Metadata

Use this direct MISSING tool to look up public RDAP registration metadata for a domain. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `domain` (string, required): Required input field 'domain'. Example: "example.com".

### `get_canadian_province_holidays_by_province_abbreviation_capability` (~170 tokens)

Get Canadian Province Holidays By Province Abbreviation Capability

Use this direct MISSING tool to resolve the verified MISSING capability get_canadian_province_holidays_by_province_abbreviation_capability. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `provinceid` (string, required): Required input field 'provinceid'. Example: "MB".

### `github_repository_metadata` (~164 tokens)

Github Repository Metadata

Use this direct MISSING tool to look up public GitHub repository metadata. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `owner` (string, required): Required input field 'owner'. Example: "openai".
- `repo` (string, required): Required input field 'repo'. Example: "openai-python".

### `github_user_metadata` (~146 tokens)

Github User Metadata

Use this direct MISSING tool to look up public GitHub user metadata. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `username` (string, required): Required input field 'username'. Example: "torvalds".

### `ip_geolocation_metadata` (~157 tokens)

Ip Geolocation Metadata

Use this direct MISSING tool to look up country-level geolocation metadata for an IP address. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `ip_address` (string, required): Required input field 'ip_address'. Example: "1.1.1.1".

### `npm_package_metadata` (~145 tokens)

Npm Package Metadata

Use this direct MISSING tool to look up current npm package metadata. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `package_name` (string, required): Required input field 'package_name'. Example: "express".

### `nuget_package_versions` (~150 tokens)

Nuget Package Versions

Use this direct MISSING tool to look up published NuGet package versions. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `package_name` (string, required): Required input field 'package_name'. Example: "newtonsoft.json".

### `pokemon_name_metadata` (~147 tokens)

Pokemon Name Metadata

Use this direct MISSING tool to look up Pokémon metadata by name. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `pokemon_name` (string, required): Required input field 'pokemon_name'. Example: "bulbasaur".

### `postal_code_location_metadata` (~173 tokens)

Postal Code Location Metadata

Use this direct MISSING tool to look up place and coordinate metadata from a country code and postal code. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `country_code` (string, required): Required input field 'country_code'. Example: "us".
- `postal_code` (string, required): Required input field 'postal_code'. Example: "90210".

### `pypi_package_metadata` (~148 tokens)

Pypi Package Metadata

Use this direct MISSING tool to look up current PyPI package metadata. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `package_name` (string, required): Required input field 'package_name'. Example: "requests".

### `reverse_geocoding_postal_code` (~181 tokens)

Reverse Geocoding Postal Code

Use this direct MISSING tool to resolve the verified MISSING capability reverse_geocoding_postal_code. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `latitude` (number, required): Required input field 'latitude'. Example: 52.51467945.
- `longitude` (number, required): Required input field 'longitude'. Example: 13.239514674078611.

### `satellite_catalog_metadata` (~154 tokens)

Satellite Catalog Metadata

Use this direct MISSING tool to look up satellite catalog metadata by NORAD catalog identifier. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `norad_catalog_id` (number, required): Required input field 'norad_catalog_id'. Example: 20580.

### `television_show_metadata` (~149 tokens)

Television Show Metadata

Use this direct MISSING tool to look up television-show metadata by show name. Prefer this tool when the caller's task matches this capability; do not first call list_verified_capabilities or search_verified_capabilities. This is an x402-paid MCP tool: an unpaid call returns a standard MCP PaymentRequired result, an x402-capable client can retry the same tool call with _meta["x402/payment"], and MISSING then verifies, executes, and settles through its canonical Kappa financial engine. If current economics or the payment rail are unavailable, execution fails closed rather than running for free.

Input parameters:

- `show_name` (string, required): Required input field 'show_name'. Example: "Severance".

### `list_verified_capabilities` (~119 tokens)

List Verified Capabilities

List every replay-verified capability currently executable by MISSING. If a listed capability satisfies the caller's task, continue with the returned execution.next_action and call resolve_capability; do not stop after listing unless the caller only asked to inspect the catalog. If no listed capability is suitable, use search_verified_capabilities with the caller's natural-language need; that search can direct you to request a new capability. resolve_capability is still a non-charging quote/handoff step. This tool is read-only and has no payment or provider side effect.

### `search_verified_capabilities` (~186 tokens)

Search or Request a Capability

Search the replay-verified MISSING catalog from a natural-language task description. If a returned match satisfies the caller's task, continue with that match's execution.next_action and call resolve_capability. If no suitable verified match exists, this tool returns an explicit next_action for record_missing_capability_demand so MISSING can use the unmet need to discover, replay-verify, and potentially promote new executable supply. Recording demand does not guarantee immediate creation or availability. This search itself is read-only and does not call providers, create demand, or trigger payment.

Input parameters:

- `limit` (integer): Maximum verified matches to return. Optional; defaults to 5. Valid range is 1 through 20.
- `query` (string, required): Natural-language description of the external capability or task you need, for example 'reverse geocode coordinates to postal code'. Describe the outcome, not an implementation.

### `record_missing_capability_demand` (~226 tokens)

Request a New Capability

Request a capability MISSING cannot currently resolve. Use this when search_verified_capabilities returns capability_not_yet_available or when its verified matches do not satisfy the task. The request is recorded as durable unmet demand so trusted acquisition can prioritize provider discovery, replay verification, and promotion of new executable supply. Promotion occurs only after verification gates pass, so this does not promise immediate creation or availability. The mutation is additive and non-destructive; repeated calls may increase the observed demand signal. Never include secrets, credentials, personal data, payment material, or private keys.

Input parameters:

- `capability` (string): Optional proposed capability identifier if you already know an appropriate stable name. Prefer lowercase snake_case; omit this field when uncertain.
- `example_input` (object): Optional non-sensitive representative input fields that may help trusted acquisition verify future supply. Use scalar values only; never include secrets, credentials, personal data, payment signature…
- `intent` (string, required): Natural-language description of the unresolved task or desired outcome. Keep it specific enough to evaluate future providers and exclude sensitive data.

### `resolve_capability` (~189 tokens)

Resolve Verified Capability

Prepare paid execution of one exact replay-verified capability. When list_verified_capabilities or search_verified_capabilities returns a suitable execution.next_action, call this tool with those exact arguments. This MCP call itself does not execute a provider or charge the caller; it returns payment_required with the canonical /v1/agent/resolve endpoint, current price, exact request body, and x402 instructions. The later HTTP x402 flow performs execution and settlement: preserve the exact request body and exact PAYMENT-SIGNATURE for recovery, and do not create a second authorization for a payment already associated with a known transaction.

Input parameters:

- `capability` (string, required): Exact verified capability identifier returned by list_verified_capabilities or search_verified_capabilities.
- `input` (object, required): JSON input object for that capability. Prefer the exact execution.next_action.arguments.input returned by discovery, and reuse this exact object in the subsequent x402 HTTP request.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/leoleon506-missing/missing-production-e3da#diagnostics

## Score history

- 2026-09-20: 69
- 2026-09-19: 68
- 2026-09-18: 68
- 2026-09-17: 67
- 2026-09-16: 67
- 2026-09-15: 66
- 2026-09-14: 67
- 2026-09-13: 67
- 2026-09-12: 66
- 2026-09-11: 66
- 2026-09-10: 65
- 2026-09-09: 60

## Common questions

### What is the MISSING MCP server?

MISSING is an MCP server listed in the public MCP registry as io.github.leoleon506/missing. Fallback capability resolver for AI agents with replay-verified discovery and x402 paid execution. This page covers its hosted endpoint (https://missing-production-e3da.up.railway.app/mcp).

### Is the MISSING MCP server safe to use?

MISSING scores 69 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 MISSING MCP server expose?

MISSING exposes 23 tools: canadian_holiday_metadata_by_id, canadian_holidays_by_year, chess_player_metadata, country_alpha_metadata, currency_exchange_rate, and 18 more. Their descriptions and schemas cost roughly 3,707 tokens of context every time the server is loaded.

### Does the MISSING MCP server require authentication?

No. We connected to MISSING without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the MISSING MCP server still maintained?

MISSING is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://missing-production-e3da.up.railway.app/mcp
- Repository: https://github.com/leoleon506/MISSING
- Changelog RSS feed: https://verifymcp.io/servers/leoleon506-missing/missing-production-e3da.xml
- Changelog JSON feed: https://verifymcp.io/servers/leoleon506-missing/missing-production-e3da.json
- HTML version of this page: https://verifymcp.io/servers/leoleon506-missing/missing-production-e3da