FreightUtils MCP Server

Air Cargo ULD Lookup

uld_lookup

Read-onlyIdempotent

Look up air-cargo ULD (Unit Load Device) specifications — 16 types spanning lower-deck containers (AKE/LD3 and family), main-deck pallets (PMC, PAG and family) and temperature-controlled units. Each record carries external/internal/door dimensions (cm), tare and max gross weight (kg), usable volume (m³), deck position and compatible aircraft.

Provide type as an IATA code ("AKE", "PMC"), slug ("ake-ld3") or the record's own name when one record carries it ("LD3" → AKE); omit it to list all 16; category (container | pallet | special) and deck (lower | main) filter the list.

Behavior: read-only; an unknown type errors with the closest codes; a single record carries its provenance (sources, audited_at, decision_rationale). A list (no single record asked for) returns summary rows with total, truncated, next_offset and detail_hint; full: true returns full records five per page, with offset / limit to page. Rate-limited: a limit error carries reset_at, the UTC time the allowance resets.

Returns: the ULD record (or the list) under result, plus confidence, _source and citation (the FreightUtils v1 response envelope). Field names as this package serves them (snake_case); the hosted /api/mcp endpoint serves the same fields in camelCase (e.g. total_cbm → totalCbm).

Limitations: specs are compiled from manufacturer and carrier-published sources with ≥7 cited sources per record. Provenance is PENDING, not verified — read the envelope's provenance_status rather than this sentence. Second-agent coverage is now COMPLETE — every cited record-URL pairing has been opened and verdicted by a second agent, and 145 of 148 citations carry a timestamped read (the 3 without one were never opened, and say so). COVERAGE IS NOT AGREEMENT, which is why provenance is still pending: reading every page is what made the disagreements visible, not what resolved them. The second agent also WITHDRAWS stamps — pages a first pass had confirmed turned out not to list the code, or to disagree once somebody read the words around them — so treat an unstamped citation as evidence that was tried and failed, not evidence not yet gathered. CORROBORATION IS COUNTED BY PUBLISHER, NOT BY URL: the 148 citations resolve to 125 distinct sources, because several records cite one publisher at several of its own addresses (one carrier's pallet table appears in three of its documents) and several forwarders republish a single upstream template. Two citations of the same source cannot corroborate each other, so a long source list is not the same as a well-corroborated record. Treat tare_weight with particular caution: it is confirmed by no non-tertiary source on 13 of the 16 records. PGA's 565 kg is now read-confirmed by one carrier (Cathay, basis stated on the page as including nets) while two other carrier pages publish 535 kg and 505-545 kg on that same basis, so it is the top of a contested band rather than an agreed figure. Confidence is medium and a PROVENANCE_PENDING advisory rides every response. Pallet records (PMC, PAG, PGA, PLA, PAJ, PMCQ7) have NO internal dimensions — a pallet has no walls or roof; read max_build_up_height_cm for the aircraft contour ceiling and do not multiply dimensions to get a volume. Airline-specific ULD variants still differ; confirm operationally critical dimensions with the carrier.

Related: chargeable_weight_calculator (what the cargo inside is billed at), container_lookup (the sea-freight equivalent), airline_lookup (whose aircraft it flies on).

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

Name	Required	Description
`deck`	No	Filter by deck position
`full`	No	Lists only: true returns full records (provenance, sources, rationale) instead of summary rows. A single-record call always returns the full record.
`type`	No	ULD code (e.g., "AKE", "PMC") or slug (e.g., "ake-ld3"). Omit to list all.
`limit`	No	Lists only: rows per page (default: every row for summaries; 5 with full: true).
`offset`	No	Lists only: rows to skip (default 0). The response gives total and next_offset.
`category`	No	Filter by ULD category

Output Schema

Name	Required	Description	Default
`ok`	Yes
`_meta`	No
`as_of`	No
`result`	Yes
`status`	No
`_source`	Yes
`edition`	No
`citation`	Yes
`validity`	No
`warnings`	No
`confidence`	Yes
`missing_inputs`	No
`blocking_errors`	No
`envelope_version`	Yes
`normalized_input`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedNov 6, 2026

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"
+}

Changed1 schema field changedNov 6, 2026

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"
+}

Changed2 schema fields changedNov 4, 2026
- 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"
+]
```

Changed1 schema field changedOct 30, 2026

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"
+}

Changed1 schema field changedOct 29, 2026
- addedOutput schema / properties / _meta / properties / edition_basis
```
Added value: +{
+  "type": "string"
+}
```

Changed1 schema field changedOct 29, 2026

addedOutput schema / properties / _meta

Added value: +{
+  "additionalProperties": {},
+  "properties": {
+    "check_id": {
+      "type": "string"
+    },
+    "receipt_url": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Changed5 schema fields changedOct 29, 2026

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"
+}

Changed2 schema fields changedOct 28, 2026
- 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"
+]
```
Changed1 schema field changedOct 8, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```

Changed3 schema fields changedOct 8, 2026

addedInput schema / properties / full

Added value: +{
+  "description": "Lists only: true returns full records (provenance, sources, rationale) instead of summary rows. A single-record call always returns the full record.",
+  "type": "boolean"
+}

addedInput schema / properties / limit

Added value: +{
+  "description": "Lists only: rows per page (default: every row for summaries; 5 with full: true).",
+  "maximum": 100,
+  "minimum": 1,
+  "type": "integer"
+}

addedInput schema / properties / offset

Added value: +{
+  "description": "Lists only: rows to skip (default 0). The response gives total and next_offset.",
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}

Changed5 schema fields changedAug 11, 2026
- 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"
+]
```

Changed1 schema field changedJul 9, 2026

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"
+}

Changed2 schema fields changedJun 19, 2026

changedInput schema / properties / type / description

Previous value: -"ULD code (e.g., \"AKE\", \"PMC\"). Omit to list all."New value: +"ULD code (e.g., \"AKE\", \"PMC\") or slug (e.g., \"ake-ld3\"). Omit to list all."

addedInput schema / properties / type / minLength
```
Added value: +2
```

First observedApr 23, 2026

TDQS

A4.2/5.0

Behavior5/5

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

Annotations already declare read-only and idempotent, but the description adds a lot beyond them: unknown-type errors return the closest codes, list responses carry total/truncated/next_offset/detail_hint, full:true pages five at a time, and rate-limit errors carry reset_at. It also discloses the response envelope, the PROVENANCE_PENDING advisory on every response, and the practical trap that pallet records have no internal dimensions and must use max_build_up_height_cm rather than a dimension product.

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

Conciseness2/5

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

Front-loaded and sectioned (Behavior, Returns, Limitations, Related, Identifiers), which helps, but the Limitations block runs on for many sentences about second-agent coverage, withdrawal of stamps, publisher-level corroboration and the PGA weight band. It even instructs the reader to 'read the envelope's provenance_status rather than this sentence', a self-admission that this prose does not earn its place in a tool definition.

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?

An output schema exists and annotations cover the safety profile, so the description needn't explain return shapes — yet it still supplies error behavior, pagination, rate limiting and the snake_case vs camelCase field-naming difference between the package and hosted endpoint. Nothing an agent needs in order to call this correctly is missing.

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

Parameters3/5

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

Schema coverage is 100%, so all six parameters are already documented in the schema, which sets the baseline at 3. The description does add real meaning the schema lacks — the type field also accepts a record name and performs a "LD3" → AKE resolution, and it clarifies how offset/limit interact with full:true paging. That is genuine supplementation, but it is spread thin across a long text rather than concentrated on the parameters.

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?

Opens with a concrete verb+resource: "Look up air-cargo ULD (Unit Load Device) specifications — 16 types..." and names the three families (lower-deck containers, main-deck pallets, temperature-controlled units). The field inventory (dimensions, tare/max gross, volume, deck, aircraft) makes the output scope unambiguous, and the closing 'Related' line distinguishes it from container_lookup, chargeable_weight_calculator and airline_lookup.

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?

Gives explicit invocation guidance: type accepts an IATA code, slug, or the record's own name ("LD3" → AKE), omit it to list all 16, and category/deck filter the list. It routes the agent to three siblings with one-phrase differentiators. It stops short of stating when NOT to use it (e.g. when the agent actually wants chargeable weight or a sea container), so it is strong but not a full when/when-not matrix.

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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