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FreightUtils MCP Server

by io.github.SoapyRED
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HS Code Lookup

hs_code_lookup
Read-onlyIdempotent

Search 6,940 WCO Harmonized System (HS 2022) commodity codes — the 6-digit international customs classification layer. The first 2 digits are the chapter, 4 the heading, 6 the subheading.

Provide ONE of: query (free-text description search, min 2 chars), code (2-6 digit lookup, written with or without dots or spaces — "8471.30" is 847130 — returns the code plus its hierarchy), or section (Roman numeral I-XXI to browse a section).

Behavior: read-only; description search runs first against the HS 2022 descriptions (UN Comtrade H6); when none contains the words, it falls back to the UK Trade Tariff search references (HMRC's index of everyday goods names), so "laptop" finds 847130 and "computers" finds heading 8471. A fallback match is medium confidence: matched_via names HMRC's index, the citation asks you to confirm the code, and the formal tariff wording ("automatic data processing machines") stays the surest search. count 0 with an empty results[] is still a valid answer when neither finds the words. Rate-limited: a limit error carries reset_at, the UTC time the allowance resets.

Returns: the query/code echo, count and results[] (hscode, description and hierarchy context) under result, plus confidence, _source and citation (the FreightUtils v1 response envelope).

Limitations: the 6-digit international level only — national tariff lines (8-10 digits) and duty rates are set per country; classification here is indicative, not a binding ruling.

Related: uk_duty_calculator (duty/VAT for a code found here), ics2_check (EU ENS goods-description quality — a different check entirely).

Identifiers: Each record carries fu_id, a stable FreightUtils identifier (and fu_version_id where the dataset has editions); resolve_reference resolves one to exactly its record.

Input Schema

NameRequiredDescriptionDefault
codeNoExact HS code: 2–6 digits, written with or without dots or spaces (e.g. "847130", "8471.30", "0901").
codesNoBatch: up to 50 HS codes, answered as results[] in input order, each as its own code lookup with its own status. Send alone.
queryNoSearch by product description (min 2 chars)
sectionNoBrowse by section (Roman numeral I–XXI)

Output Schema

NameRequiredDescriptionDefault
okYes
_metaNo
as_ofNo
resultYes
statusNo
_sourceYes
editionNo
citationYes
validityNo
warningsNo
confidenceYes
missing_inputsNo
blocking_errorsNo
envelope_versionYes
normalized_inputNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • addedOutput schema / properties / _meta / properties / upstream
      Added value: +{
+  "additionalProperties": {},
+  "properties": {
+    "datasets": {
+      "additionalProperties": {
+        "additionalProperties": {},
+        "properties": {
+          "kind": {
+            "anyOf": [
+              {
+                "enum": [
+                  "watched",
+                  "checksum-only",
+                  "manual"
+                ],
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "last_success": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "reason": {
+            "type": "string"
+          },
+          "stale": {
+            "type": "boolean"
+          },
+          "state": {
+            "enum": [
+              "in_step",
+              "changed_upstream",
+              "schema_drift",
+              "unreachable",
+              "window_missed",
+              "unknown"
+            ],
+            "type": "string"
+          },
+          "window_days": {
+            "type": [
+              "number",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "state",
+          "kind",
+          "last_success",
+          "window_days",
+          "stale"
+        ],
+        "type": "object"
+      },
+      "propertyNames": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "stale": {
+      "type": "boolean"
+    },
+    "state": {
+      "enum": [
+        "in_step",
+        "changed_upstream",
+        "schema_drift",
+        "unreachable",
+        "window_missed",
+        "unknown"
+      ],
+      "type": "string"
+    },
+    "state_read_at": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "required": [
+    "state",
+    "stale",
+    "state_read_at",
+    "datasets"
+  ],
+  "type": "object"
+}
  2. Changed1 schema field changed
    • addedOutput schema / properties / _meta / properties / ids
      Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "pattern": {
+      "type": "string"
+    },
+    "scheme": {
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    }
+  },
+  "required": [
+    "scheme",
+    "pattern"
+  ],
+  "type": "object"
+}
  3. Changed2 schema fields changed
    • removedOutput schema / properties / _meta / properties / receipt / properties / reason / const
      Removed value: -"key_required"
    • addedOutput schema / properties / _meta / properties / receipt / properties / reason / enum
      Added value: +[
+  "key_required",
+  "quota"
+]
  4. Changed1 schema field changed
    • addedOutput schema / properties / _meta / properties / receipt
      Added value: +{
+  "additionalProperties": {},
+  "properties": {
+    "created_at": {
+      "type": "string"
+    },
+    "dataset_version": {
+      "additionalProperties": {
+        "type": "string"
+      },
+      "propertyNames": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "engine_version": {
+      "type": "string"
+    },
+    "inputs": {},
+    "reason": {
+      "const": "key_required",
+      "type": "string"
+    },
+    "receipt_hash": {
+      "type": "string"
+    },
+    "result": {
+      "additionalProperties": {},
+      "propertyNames": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "schema_version": {
+      "type": "string"
+    },
+    "stored": {
+      "const": false,
+      "type": "boolean"
+    },
+    "tool": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "stored",
+    "reason",
+    "schema_version",
+    "receipt_hash",
+    "created_at",
+    "tool",
+    "inputs",
+    "dataset_version",
+    "engine_version",
+    "result"
+  ],
+  "type": "object"
+}
  5. Changed1 schema field changed
    • addedOutput schema / properties / _meta / properties / edition_basis
      Added value: +{
+  "type": "string"
+}
  6. Changed1 schema field changed
    • addedInput schema / properties / codes
      Added value: +{
+  "description": "Batch: up to 50 HS codes, answered as results[] in input order, each as its own code lookup with its own status. Send alone.",
+  "items": {
+    "maxLength": 14,
+    "type": "string"
+  },
+  "maxItems": 50,
+  "minItems": 1,
+  "type": "array"
+}
  7. Changed1 schema field changed
    • addedOutput schema / properties / _meta
      Added value: +{
+  "additionalProperties": {},
+  "properties": {
+    "check_id": {
+      "type": "string"
+    },
+    "receipt_url": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}
  8. Changed5 schema fields changed
    • addedOutput schema / properties / as_of
      Added value: +{
+  "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+  "type": "string"
+}
    • addedOutput schema / properties / edition
      Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "applies_from": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "may_apply_until": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "name": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "name",
+        "applies_from",
+        "may_apply_until"
+      ],
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
    • changedOutput schema / properties / envelope_version / enum
      Previous value: -[
-  "1",
-  "1.1"
-]New value: +[
+  "1",
+  "1.1",
+  "1.2"
+]
    • addedOutput schema / properties / missing_inputs
      Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}
    • addedOutput schema / properties / status
      Added value: +{
+  "enum": [
+    "ok",
+    "partial",
+    "not_found",
+    "unsupported",
+    "ambiguous"
+  ],
+  "type": "string"
+}
  9. Changed2 schema fields changed
    • removedOutput schema / properties / validity / properties / effective_to / anyOf
      Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
    • addedOutput schema / properties / validity / properties / effective_to / type
      Added value: +[
+  "string",
+  "null"
+]
  10. Changed1 schema field changed
    • addedInput schema / additionalProperties
      Added value: +false
  11. Changed2 schema fields changed
    • changedInput schema / properties / code / description
      Previous value: -"Exact HS code (2-6 digits)"New value: +"Exact HS code: 2–6 digits, written with or without dots or spaces (e.g. \"847130\", \"8471.30\", \"0901\")."
    • removedInput schema / properties / code / pattern
      Removed value: -"^\\d{2,6}$"
  12. Changed5 schema fields changed
    • addedOutput schema / properties / _source / properties / authority_current_edition
      Added value: +{
+  "type": "string"
+}
    • addedOutput schema / properties / _source / properties / checked_at
      Added value: +{
+  "type": "string"
+}
    • addedOutput schema / properties / _source / properties / dataset_edition
      Added value: +{
+  "type": "string"
+}
    • removedOutput schema / properties / envelope_version / const
      Removed value: -"1"
    • addedOutput schema / properties / envelope_version / enum
      Added value: +[
+  "1",
+  "1.1"
+]
  13. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "_source": {
+      "additionalProperties": false,
+      "properties": {
+        "checked": {
+          "type": "string"
+        },
+        "name": {
+          "type": "string"
+        },
+        "provenance_status": {
+          "enum": [
+            "verified",
+            "pending-verification",
+            "computed",
+            "live"
+          ],
+          "type": "string"
+        },
+        "source_url": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "name",
+        "checked",
+        "provenance_status"
+      ],
+      "type": "object"
+    },
+    "blocking_errors": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "type": "string"
+          },
+          "message": {
+            "type": "string"
+          },
+          "recovery": {
+            "additionalProperties": false,
+            "properties": {
+              "action": {
+                "type": "string"
+              },
+              "params": {
+                "additionalProperties": {},
+                "propertyNames": {
+                  "type": "string"
+                },
+                "type": "object"
+              },
+              "tool": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "action"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "recovery"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "citation": {
+      "additionalProperties": false,
+      "properties": {
+        "qualifier": {
+          "type": "string"
+        },
+        "text": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "text"
+      ],
+      "type": "object"
+    },
+    "confidence": {
+      "additionalProperties": false,
+      "properties": {
+        "basis": {
+          "enum": [
+            "deterministic",
+            "provenance",
+            "match_quality",
+            "freshness"
+          ],
+          "type": "string"
+        },
+        "level": {
+          "enum": [
+            "high",
+            "medium",
+            "low"
+          ],
+          "type": "string"
+        },
+        "score": {
+          "maximum": 1,
+          "minimum": 0,
+          "type": "number"
+        }
+      },
+      "required": [
+        "level",
+        "basis"
+      ],
+      "type": "object"
+    },
+    "envelope_version": {
+      "const": "1",
+      "type": "string"
+    },
+    "normalized_input": {
+      "additionalProperties": {},
+      "propertyNames": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "ok": {
+      "type": "boolean"
+    },
+    "result": {
+      "additionalProperties": {},
+      "propertyNames": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "validity": {
+      "additionalProperties": false,
+      "properties": {
+        "as_of": {
+          "type": "string"
+        },
+        "effective_from": {
+          "type": "string"
+        },
+        "effective_to": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        }
+      },
+      "required": [
+        "as_of"
+      ],
+      "type": "object"
+    },
+    "warnings": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "type": "string"
+          },
+          "details": {
+            "additionalProperties": {},
+            "propertyNames": {
+              "type": "string"
+            },
+            "type": "object"
+          },
+          "message": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "code",
+          "message"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "envelope_version",
+    "ok",
+    "result",
+    "confidence",
+    "_source",
+    "citation"
+  ],
+  "type": "object"
+}
  14. Changed5 schema fields changed
    • addedInput schema / properties / code / pattern
      Added value: +"^\\d{2,6}$"
    • changedInput schema / properties / query / description
      Previous value: -"Search by product description"New value: +"Search by product description (min 2 chars)"
    • addedInput schema / properties / query / minLength
      Added value: +2
    • changedInput schema / properties / section / description
      Previous value: -"Browse by section (Roman numeral)"New value: +"Browse by section (Roman numeral I–XXI)"
    • addedInput schema / properties / section / pattern
      Added value: +"^[ivxIVX]{1,5}$"
  15. First observed

TDQS

A4.6/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare read-only/idempotent/non-destructive, yet the description adds substantial behavior beyond them: the two-stage search and fallback, medium-confidence signaling via matched_via, the instruction to confirm a citation, that count 0 with empty results[] is still valid, and that rate-limit errors carry reset_at. Limitations (6-digit only, no national tariff lines or duty rates, indicative not a binding ruling) are exactly the kind of context annotations cannot carry.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core action, then cleanly sectioned with bolded labels (Behavior, Returns, Limitations, Related, Identifiers) that make it scannable. The "Returns:" block partly duplicates the existing output schema and the fu_id paragraph is tangential, but neither is padding enough to obscure selection.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given a lookuppable tool with full annotations, 100% schema coverage, and an output schema, an agent has everything needed: what it searches, how to invoke each mode, how to read confidence, what an empty result means, and which sibling to use next. The only minor omission is the batch `codes` route in the description, which the schema itself fully documents.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so 3 is the baseline, but the description adds real meaning: code formats are interchangeable ("8471.30" is 847130) and return the code plus its hierarchy, section is Roman numeral I–XXI to browse, and query has a specific documented fallback chain. The `codes` batch parameter is never mentioned in the description, which keeps this from a 5.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb+resource with exact scope: "Search 6,940 WCO Harmonized System (HS 2022) commodity codes — the 6-digit international customs classification layer," and even explains the 2/4/6-digit hierarchy, so an agent knows precisely what is and is not covered.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicit routing guidance: "Provide ONE of: query … code … or section," plus the fallback rule (query searched first, HMRC index second) and named alternatives — uk_duty_calculator for duty/VAT, ics2_check called out as "a different check entirely," resolve_reference for fu_id. The one gap is that the mutually-exclusive enumeration omits the `codes` batch parameter, so an agent reading only the description could think batch lookup is unsupported.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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