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Revit Model MCP

Parameter Fill Check

revit_parameter_fill_check
Read-onlyIdempotent

Count filled, empty, and missing Revit parameters by category and parameter name, with sample element IDs to locate gaps in model data.

Instructions

Count filled, empty and missing parameters per parameter and category, with samples of empty and missing element IDs. Numeric zero counts as filled. A non-empty skipped list means the result is incomplete; skippedCount counts all skipped entries.

Input Schema

NameRequiredDescriptionDefault
viewNoExact non-template view name; limits the search to that view.
levelNo
worksetNo
documentNoTitle or file name substring of the target document; needed when several Revit instances run.
categoriesYesCategory names (1 to 20) from the categories catalog; matches any listed category.
parametersYesExact localized parameter names (1 to 30); names that do not match count as missing.
process_idNoRevit process ID; takes precedence over document.
sample_limitNoMaximum sampled element IDs per empty and missing list, 1 to 100 (default 20); counts always cover all elements.
include_typesNo
timeout_secondsNoSeconds to wait for a result (default 120).
pickup_timeout_secondsNoSeconds to wait for the add-in to pick up the job (default 300); unused over HTTP.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed21 schema fields changedv0.10.0
    • changedInput schema / properties / categories / description
      Previous value: -"Required list of 1-20 category names from the categories catalog; no default. Matches any listed category and combines with level, workset and view filters."New value: +"Category names (1 to 20) from the categories catalog; matches any listed category."
    • removedInput schema / properties / categories / title
      Removed value: -"Categories"
    • changedInput schema / properties / document / description
      Previous value: -"Case-insensitive substring of the target active document title or file name. Reads require exactly one matching instance; omitted document requires exactly one running instance. Zero or multiple matches fail before publishing. revit_list_instances returns all matching instances, or all running instances when omitted."New value: +"Title or file name substring of the target document; needed when several Revit instances run."
    • removedInput schema / properties / document / title
      Removed value: -"Document"
    • removedInput schema / properties / include_types / title
      Removed value: -"Include Types"
    • removedInput schema / properties / level / title
      Removed value: -"Level"
    • changedInput schema / properties / parameters / description
      Previous value: -"Required list of 1-30 exact localized parameter names; no default. Each name uses the first LookupParameter match, with type fallback controlled by include_types; missing names are counted as missing."New value: +"Exact localized parameter names (1 to 30); names that do not match count as missing."
    • removedInput schema / properties / parameters / title
      Removed value: -"Parameters"
    • changedInput schema / properties / pickup_timeout_seconds / description
      Previous value: -"Positive integer seconds to wait for the add-in to pick up a local or SSH job (300 when omitted); ignored over HTTP. A pickup timeout raises an error but the pending job may still execute later."New value: +"Seconds to wait for the add-in to pick up the job (default 300); unused over HTTP."
    • removedInput schema / properties / pickup_timeout_seconds / title
      Removed value: -"Pickup Timeout Seconds"
    • changedInput schema / properties / process_id / description
      Previous value: -"Exact positive Revit process ID. Takes precedence over document; if both are supplied they must agree."New value: +"Revit process ID; takes precedence over document."
    • removedInput schema / properties / process_id / title
      Removed value: -"Process Id"
    • changedInput schema / properties / sample_limit / description
      Previous value: -"Maximum element IDs sampled per parameter for each empty and missing list, an integer from 1 to 100. Default 20 limits samples only; all matching elements contribute to counts."New value: +"Maximum sampled element IDs per empty and missing list, 1 to 100 (default 20); counts always cover all elements."
    • removedInput schema / properties / sample_limit / title
      Removed value: -"Sample Limit"
    • changedInput schema / properties / timeout_seconds / description
      Previous value: -"Positive integer seconds to wait for a result after pickup (120 when omitted); HTTP uses this as its response budget. Expiry raises an error, and increasing it does not override the add-in's execution limits."New value: +"Seconds to wait for a result (default 120)."
    • removedInput schema / properties / timeout_seconds / title
      Removed value: -"Timeout Seconds"
    • changedInput schema / properties / view / description
      Previous value: -"Exact non-template view name from the views catalog, matched case-insensitively, to restrict the element collector. Default null searches the document without a view filter; combines with the other model filters."New value: +"Exact non-template view name; limits the search to that view."
    • removedInput schema / properties / view / title
      Removed value: -"View"
    • removedInput schema / properties / workset / title
      Removed value: -"Workset"
    • removedInput schema / title
      Removed value: -"revit_parameter_fill_checkArguments"
    • removedOutput schema / title
      Removed value: -"revit_parameter_fill_checkDictOutput"
  2. Changed2 schema fields changedv0.7.0
    • changedInput schema / properties / document / description
      Previous value: -"Case-insensitive substring of the target active document title or file name; default null leaves requests unaddressed, so any instance may respond. Use a unique substring with multiple instances; revit_list_instances instead returns all matching instances, or all instances when omitted."New value: +"Case-insensitive substring of the target active document title or file name. Reads require exactly one matching instance; omitted document requires exactly one running instance. Zero or multiple matches fail before publishing. revit_list_instances returns all matching instances, or all running instances when omitted."
    • addedInput schema / properties / process_id
      Added value: +{
      +  "anyOf": [
      +    {
      +      "type": "integer"
      +    },
      +    {
      +      "type": "null"
      +    }
      +  ],
      +  "default": null,
      +  "description": "Exact positive Revit process ID. Takes precedence over document; if both are supplied they must agree.",
      +  "title": "Process Id"
      +}
  3. Changed7 schema fields changedv0.1.1
    • addedInput schema / properties / categories / description
      Added value: +"Required list of 1-20 category names from the categories catalog; no default. Matches any listed category and combines with level, workset and view filters."
    • addedInput schema / properties / document / description
      Added value: +"Case-insensitive substring of the target active document title or file name; default null leaves requests unaddressed, so any instance may respond. Use a unique substring with multiple instances; revit_list_instances instead returns all matching instances, or all instances when omitted."
    • addedInput schema / properties / parameters / description
      Added value: +"Required list of 1-30 exact localized parameter names; no default. Each name uses the first LookupParameter match, with type fallback controlled by include_types; missing names are counted as missing."
    • addedInput schema / properties / pickup_timeout_seconds / description
      Added value: +"Positive integer seconds to wait for the add-in to pick up a local or SSH job (300 when omitted); ignored over HTTP. A pickup timeout raises an error but the pending job may still execute later."
    • addedInput schema / properties / sample_limit / description
      Added value: +"Maximum element IDs sampled per parameter for each empty and missing list, an integer from 1 to 100. Default 20 limits samples only; all matching elements contribute to counts."
    • addedInput schema / properties / timeout_seconds / description
      Added value: +"Positive integer seconds to wait for a result after pickup (120 when omitted); HTTP uses this as its response budget. Expiry raises an error, and increasing it does not override the add-in's execution limits."
    • addedInput schema / properties / view / description
      Added value: +"Exact non-template view name from the views catalog, matched case-insensitively, to restrict the element collector. Default null searches the document without a view filter; combines with the other model filters."
  4. First observed

TDQS

A3.6/5.0
Behavior4/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), and the description adds genuinely useful semantics beyond them: zero counts as filled, a non-empty skipped list signals an incomplete result, and skippedCount aggregates all skipped entries. It does not discuss scope limits (category/parameter caps) or performance, but the interpretation rules are the key behavioral context here.

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

Conciseness5/5

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

Three tight sentences, front-loaded with the core action and result shape, followed by the two interpretation rules an agent most needs. No filler or restatement of the name.

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

Completeness4/5

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

An output schema exists, so return structure need not be described, and the description supplies the result-interpretation rules (zero, skipped, skippedCount) that the schema cannot. Minor gap: it says nothing about the category/parameter caps or the document/process disambiguation, which live only in the schema.

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 description coverage is 73%, with parameters like level, workset, and include_types undocumented in both places, so the description does not fully compensate. It does add value the schema lacks (numeric zero treated as filled; exact localized name mismatch counts as missing), which is the right kind of semantic addition but leaves gaps.

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

Purpose4/5

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

States a specific verb (count) and resource (filled/empty/missing parameters per parameter and category) plus the return shape of samples. It is clearly distinguishable from write siblings like revit_set_parameter or revit_update_parameters, though it never names an alternative explicitly.

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

Usage Guidelines2/5

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

There is no statement of when to reach for this audit versus, say, revit_query_elements, revit_aggregate_elements, or revit_family_audit, and no prerequisites or exclusions. Usage has to be inferred from the counting semantics alone.

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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