Materials Project API — Materials

naftiko: 1.0.0-alpha2
info:
  label: Materials Project API — Materials
  description: 'Materials Project API — Materials. 4 operations. Lead operation: Get MaterialsDoc documents. Self-contained
    Naftiko capability covering one Materials Project business surface.'
  tags:
  - Materials Project
  - Materials
  created: '2026-05-19'
  modified: '2026-05-19'
binds:
- namespace: env
  keys:
    MATERIALS_PROJECT_API_KEY: MATERIALS_PROJECT_API_KEY
capability:
  consumes:
  - type: http
    namespace: materials-project-materials
    baseUri: ''
    description: Materials Project API — Materials business capability. Self-contained, no shared references.
    resources:
    - name: materials-core
      path: /materials/core/
      operations:
      - name: searchmaterialscoreget
        method: GET
        description: Get MaterialsDoc documents
        outputRawFormat: json
        outputParameters:
        - name: result
          type: object
          value: $.
        inputParameters:
        - name: material_ids
          in: query
          type: string
          description: Comma-separated list of material_id values to query on
        - name: formula
          in: query
          type: string
          description: Query by formula including anonymized formula or by including wild cards. A comma delimited string
            list of anonymous formulas or regular formulas can also be pr
        - name: chemsys
          in: query
          type: string
          description: A comma delimited string list of chemical systems. Wildcards for unknown elements only supported for
            single chemsys queries
        - name: elements
          in: query
          type: string
          description: Query by elements in the material composition as a comma-separated list
        - name: exclude_elements
          in: query
          type: string
          description: Query by excluded elements in the material composition as a comma-separated list
        - name: task_ids
          in: query
          type: string
          description: Comma-separated list of task_ids to query on
        - name: crystal_system
          in: query
          type: string
          description: Crystal system of the material. If a comma-separated string, will query by multiple crystal systems.
        - name: spacegroup_number
          in: query
          type: string
          description: Space group number of the material. If a comma-separated string, will query by multiple space group
            numbers.
        - name: spacegroup_symbol
          in: query
          type: string
          description: Space group symbol of the material. If a comma-separated string, will query by multiple space group
            numbers.
        - name: deprecated
          in: query
          type: string
          description: Whether the material is marked as deprecated
        - name: nsites_max
          in: query
          type: string
          description: Query for maximum value of nsites
        - name: nsites_min
          in: query
          type: string
          description: Query for minimum value of nsites
        - name: nsites
          in: query
          type: string
          description: Query for nsites being equal to an exact value
        - name: nsites_not_eq
          in: query
          type: string
          description: Query for nsites being not equal to an exact value
        - name: nsites_eq_any
          in: query
          type: string
          description: Query for nsites being any of these values. Provide a comma separated list.
        - name: nsites_neq_any
          in: query
          type: string
          description: Query for nsites being not any of these values.                             Provide a comma separated
            list.
        - name: nelements_max
          in: query
          type: string
          description: Query for maximum value of nelements
        - name: nelements_min
          in: query
          type: string
          description: Query for minimum value of nelements
        - name: nelements
          in: query
          type: string
          description: Query for nelements being equal to an exact value
        - name: nelements_not_eq
          in: query
          type: string
          description: Query for nelements being not equal to an exact value
        - name: nelements_eq_any
          in: query
          type: string
          description: Query for nelements being any of these values. Provide a comma separated list.
        - name: nelements_neq_any
          in: query
          type: string
          description: Query for nelements being not any of these values.                             Provide a comma separated
            list.
        - name: volume_max
          in: query
          type: string
          description: Query for maximum value of volume
        - name: volume_min
          in: query
          type: string
          description: Query for minimum value of volume
        - name: density_max
          in: query
          type: string
          description: Query for maximum value of density
        - name: density_min
          in: query
          type: string
          description: Query for minimum value of density
        - name: density_atomic_max
          in: query
          type: string
          description: Query for maximum value of density_atomic
        - name: density_atomic_min
          in: query
          type: string
          description: Query for minimum value of density_atomic
        - name: _page
          in: query
          type: integer
          description: Page number to request (takes precedent over _limit and _skip).
        - name: _per_page
          in: query
          type: integer
          description: Number of entries to show per page (takes precedent over _limit and _skip). Limited to 1000.
        - name: _skip
          in: query
          type: integer
          description: Number of entries to skip in the search.
        - name: _limit
          in: query
          type: integer
          description: Max number of entries to return in a single query. Limited to 1000.
        - name: _fields
          in: query
          type: string
          description: 'Fields to project from MaterialsDoc as a list of comma separated strings.                    Fields
            include: `builder_meta` `nsites` `elements` `nelements` `com'
        - name: _all_fields
          in: query
          type: boolean
          description: Include all fields.
        - name: license
          in: query
          type: string
          description: Query by license. Can be commercial or non-commercial, or both
        - name: batch_id
          in: query
          type: string
          description: Query by batch identifier
        - name: batch_id_not_eq
          in: query
          type: string
          description: Exclude batch identifier
        - name: batch_id_eq_any
          in: query
          type: string
          description: Query by a comma-separated list of batch identifiers
        - name: batch_id_neq_any
          in: query
          type: string
          description: Exclude a comma-separated list of batch identifiers
    - name: materials-core-blessed_tasks
      path: /materials/core/blessed_tasks/
      operations:
      - name: searchmaterialscoreblessedtasksget
        method: GET
        description: Get MaterialsDoc documents
        outputRawFormat: json
        outputParameters:
        - name: result
          type: object
          value: $.
        inputParameters:
        - name: run_type
          in: query
          type: string
          description: Calculation run type of blessed task data
          required: true
        - name: energy_min
          in: query
          type: string
          description: Minimum total uncorrected DFT energy in eV/atom
        - name: energy_max
          in: query
          type: string
          description: Maximum total uncorrected DFT energy in eV/atom
        - name: material_ids
          in: query
          type: string
          description: Comma-separated list of material_id values to query on
        - name: formula
          in: query
          type: string
          description: Query by formula including anonymized formula or by including wild cards. A comma delimited string
            list of anonymous formulas or regular formulas can also be pr
        - name: chemsys
          in: query
          type: string
          description: A comma delimited string list of chemical systems. Wildcards for unknown elements only supported for
            single chemsys queries
        - name: elements
          in: query
          type: string
          description: Query by elements in the material composition as a comma-separated list
        - name: exclude_elements
          in: query
          type: string
          description: Query by excluded elements in the material composition as a comma-separated list
        - name: task_ids
          in: query
          type: string
          description: Comma-separated list of task_ids to query on
        - name: deprecated
          in: query
          type: string
          description: Whether the material is marked as deprecated
        - name: nsites_max
          in: query
          type: string
          description: Query for maximum value of nsites
        - name: nsites_min
          in: query
          type: string
          description: Query for minimum value of nsites
        - name: nsites
          in: query
          type: string
          description: Query for nsites being equal to an exact value
        - name: nsites_not_eq
          in: query
          type: string
          description: Query for nsites being not equal to an exact value
        - name: nsites_eq_any
          in: query
          type: string
          description: Query for nsites being any of these values. Provide a comma separated list.
        - name: nsites_neq_any
          in: query
          type: string
          description: Query for nsites being not any of these values.                             Provide a comma separated
            list.
        - name: nelements_max
          in: query
          type: string
          description: Query for maximum value of nelements
        - name: nelements_min
          in: query
          type: string
          description: Query for minimum value of nelements
        - name: nelements
          in: query
          type: string
          description: Query for nelements being equal to an exact value
        - name: nelements_not_eq
          in: query
          type: string
          description: Query for nelements being not equal to an exact value
        - name: nelements_eq_any
          in: query
          type: string
          description: Query for nelements being any of these values. Provide a comma separated list.
        - name: nelements_neq_any
          in: query
          type: string
          description: Query for nelements being not any of these values.                             Provide a comma separated
            list.
        - name: volume_max
          in: query
          type: string
          description: Query for maximum value of volume
        - name: volume_min
          in: query
          type: string
          description: Query for minimum value of volume
        - name: density_max
          in: query
          type: string
          description: Query for maximum value of density
        - name: density_min
          in: query
          type: string
          description: Query for minimum value of density
        - name: density_atomic_max
          in: query
          type: string
          description: Query for maximum value of density_atomic
        - name: density_atomic_min
          in: query
          type: string
          description: Query for minimum value of density_atomic
        - name: _page
          in: query
          type: integer
          description: Page number to request (takes precedent over _limit and _skip).
        - name: _per_page
          in: query
          type: integer
          description: Number of entries to show per page (takes precedent over _limit and _skip). Limited to 1000.
        - name: _skip
          in: query
          type: integer
          description: Number of entries to skip in the search.
        - name: _limit
          in: query
          type: integer
          description: Max number of entries to return in a single query. Limited to 1000.
        - name: license
          in: query
          type: string
          description: Query by license. Can be commercial or non-commercial, or both
        - name: _fields
          in: query
          type: string
          description: 'Fields to project from MaterialsDoc as a list of comma separated strings.                    Fields
            include: `builder_meta` `nsites` `elements` `nelements` `com'
        - name: _all_fields
          in: query
          type: boolean
          description: Include all fields.
    - name: materials-core-find_structure
      path: /materials/core/find_structure/
      operations:
      - name: searchmaterialscorefindstructurepost
        method: POST
        description: Post FindStructure documents
        outputRawFormat: json
        outputParameters:
        - name: result
          type: object
          value: $.
        inputParameters:
        - name: ltol
          in: query
          type: number
          description: Fractional length tolerance. Default is 0.2.
        - name: stol
          in: query
          type: number
          description: Site tolerance. Defined as the fraction of the average free                     length per atom :=
            ( V / Nsites ) ** (1/3). Default is 0.3.
        - name: angle_tol
          in: query
          type: number
          description: Angle tolerance in degrees. Default is 5 degrees.
        - name: _limit
          in: query
          type: integer
          description: Maximum number of matches to show. Defaults to 1, only showing the best match.
        - name: body
          in: body
          type: object
          description: Request body (JSON).
          required: true
    - name: materials-core-formula_autocomplete
      path: /materials/core/formula_autocomplete/
      operations:
      - name: searchmaterialscoreformulaautocompleteget
        method: GET
        description: Get FormulaAutocomplete documents
        outputRawFormat: json
        outputParameters:
        - name: result
          type: object
          value: $.
        inputParameters:
        - name: formula
          in: query
          type: string
          description: Human readable chemical formula.
          required: true
        - name: limit
          in: query
          type: integer
          description: Maximum number of matches to show. Defaults to 10.
    authentication:
      type: apikey
      key: X-API-KEY
      value: '{{env.MATERIALS_PROJECT_API_KEY}}'
      placement: header
  exposes:
  - type: rest
    namespace: materials-project-materials-rest
    port: 8080
    description: REST adapter for Materials Project API — Materials. One Spectral-compliant resource per consumed operation,
      prefixed with /v1.
    resources:
    - path: /v1/materials/core
      name: materials-core
      description: REST surface for materials-core.
      operations:
      - method: GET
        name: searchmaterialscoreget
        description: Get MaterialsDoc documents
        call: materials-project-materials.searchmaterialscoreget
        with:
          material_ids: rest.material_ids
          formula: rest.formula
          chemsys: rest.chemsys
          elements: rest.elements
          exclude_elements: rest.exclude_elements
          task_ids: rest.task_ids
          crystal_system: rest.crystal_system
          spacegroup_number: rest.spacegroup_number
          spacegroup_symbol: rest.spacegroup_symbol
          deprecated: rest.deprecated
          nsites_max: rest.nsites_max
          nsites_min: rest.nsites_min
          nsites: rest.nsites
          nsites_not_eq: rest.nsites_not_eq
          nsites_eq_any: rest.nsites_eq_any
          nsites_neq_any: rest.nsites_neq_any
          nelements_max: rest.nelements_max
          nelements_min: rest.nelements_min
          nelements: rest.nelements
          nelements_not_eq: rest.nelements_not_eq
          nelements_eq_any: rest.nelements_eq_any
          nelements_neq_any: rest.nelements_neq_any
          volume_max: rest.volume_max
          volume_min: rest.volume_min
          density_max: rest.density_max
          density_min: rest.density_min
          density_atomic_max: rest.density_atomic_max
          density_atomic_min: rest.density_atomic_min
          _page: rest._page
          _per_page: rest._per_page
          _skip: rest._skip
          _limit: rest._limit
          _fields: rest._fields
          _all_fields: rest._all_fields
          license: rest.license
          batch_id: rest.batch_id
          batch_id_not_eq: rest.batch_id_not_eq
          batch_id_eq_any: rest.batch_id_eq_any
          batch_id_neq_any: rest.batch_id_neq_any
        outputParameters:
        - type: object
          mapping: $.
    - path: /v1/materials/core/blessed-tasks
      name: materials-core-blessed-tasks
      description: REST surface for materials-core-blessed_tasks.
      operations:
      - method: GET
        name: searchmaterialscoreblessedtasksget
        description: Get MaterialsDoc documents
        call: materials-project-materials.searchmaterialscoreblessedtasksget
        with:
          run_type: rest.run_type
          energy_min: rest.energy_min
          energy_max: rest.energy_max
          material_ids: rest.material_ids
          formula: rest.formula
          chemsys: rest.chemsys
          elements: rest.elements
          exclude_elements: rest.exclude_elements
          task_ids: rest.task_ids
          deprecated: rest.deprecated
          nsites_max: rest.nsites_max
          nsites_min: rest.nsites_min
          nsites: rest.nsites
          nsites_not_eq: rest.nsites_not_eq
          nsites_eq_any: rest.nsites_eq_any
          nsites_neq_any: rest.nsites_neq_any
          nelements_max: rest.nelements_max
          nelements_min: rest.nelements_min
          nelements: rest.nelements
          nelements_not_eq: rest.nelements_not_eq
          nelements_eq_any: rest.nelements_eq_any
          nelements_neq_any: rest.nelements_neq_any
          volume_max: rest.volume_max
          volume_min: rest.volume_min
          density_max: rest.density_max
          density_min: rest.density_min
          density_atomic_max: rest.density_atomic_max
          density_atomic_min: rest.density_atomic_min
          _page: rest._page
          _per_page: rest._per_page
          _skip: rest._skip
          _limit: rest._limit
          license: rest.license
          _fields: rest._fields
          _all_fields: rest._all_fields
        outputParameters:
        - type: object
          mapping: $.
    - path: /v1/materials/core/find-structure
      name: materials-core-find-structure
      description: REST surface for materials-core-find_structure.
      operations:
      - method: POST
        name: searchmaterialscorefindstructurepost
        description: Post FindStructure documents
        call: materials-project-materials.searchmaterialscorefindstructurepost
        with:
          ltol: rest.ltol
          stol: rest.stol
          angle_tol: rest.angle_tol
          _limit: rest._limit
          body: rest.body
        outputParameters:
        - type: object
          mapping: $.
    - path: /v1/materials/core/formula-autocomplete
      name: materials-core-formula-autocomplete
      description: REST surface for materials-core-formula_autocomplete.
      operations:
      - method: GET
        name: searchmaterialscoreformulaautocompleteget
        description: Get FormulaAutocomplete documents
        call: materials-project-materials.searchmaterialscoreformulaautocompleteget
        with:
          formula: rest.formula
          limit: rest.limit
        outputParameters:
        - type: object
          mapping: $.
  - type: mcp
    namespace: materials-project-materials-mcp
    port: 9090
    transport: http
    description: MCP adapter for Materials Project API — Materials. One tool per consumed operation, routed inline through
      this capability's consumes block.
    tools:
    - name: get-materialsdoc-documents
      description: Get MaterialsDoc documents
      hints:
        readOnly: true
        destructive: false
        idempotent: true
      call: materials-project-materials.searchmaterialscoreget
      with:
        material_ids: tools.material_ids
        formula: tools.formula
        chemsys: tools.chemsys
        elements: tools.elements
        exclude_elements: tools.exclude_elements
        task_ids: tools.task_ids
        crystal_system: tools.crystal_system
        spacegroup_number: tools.spacegroup_number
        spacegroup_symbol: tools.spacegroup_symbol
        deprecated: tools.deprecated
        nsites_max: tools.nsites_max
        nsites_min: tools.nsites_min
        nsites: tools.nsites
        nsites_not_eq: tools.nsites_not_eq
        nsites_eq_any: tools.nsites_eq_any
        nsites_neq_any: tools.nsites_neq_any
        nelements_max: tools.nelements_max
        nelements_min: tools.nelements_min
        nelements: tools.nelements
        nelements_not_eq: tools.nelements_not_eq
        nelements_eq_any: tools.nelements_eq_any
        nelements_neq_any: tools.nelements_neq_any
        volume_max: tools.volume_max
        volume_min: tools.volume_min
        density_max: tools.density_max
        density_min: tools.density_min
        density_atomic_max: tools.density_atomic_max
        density_atomic_min: tools.density_atomic_min
        _page: tools._page
        _per_page: tools._per_page
        _skip: tools._skip
        _limit: tools._limit
        _fields: tools._fields
        _all_fields: tools._all_fields
        license: tools.license
        batch_id: tools.batch_id
        batch_id_not_eq: tools.batch_id_not_eq
        batch_id_eq_any: tools.batch_id_eq_any
        batch_id_neq_any: tools.batch_id_neq_any
      outputParameters:
      - type: object
        mapping: $.
    - name: get-materialsdoc-documents-2
      description: Get MaterialsDoc documents
      hints:
        readOnly: true
        destructive: false
        idempotent: true
      call: materials-project-materials.searchmaterialscoreblessedtasksget
      with:
        run_type: tools.run_type
        energy_min: tools.energy_min
        energy_max: tools.energy_max
        material_ids: tools.material_ids
        formula: tools.formula
        chemsys: tools.chemsys
        elements: tools.elements
        exclude_elements: tools.exclude_elements
        task_ids: tools.task_ids
        deprecated: tools.deprecated
        nsites_max: tools.nsites_max
        nsites_min: tools.nsites_min
        nsites: tools.nsites
        nsites_not_eq: tools.nsites_not_eq
        nsites_eq_any: tools.nsites_eq_any
        nsites_neq_any: tools.nsites_neq_any
        nelements_max: tools.nelements_max
        nelements_min: tools.nelements_min
        nelements: tools.nelements
        nelements_not_eq: tools.nelements_not_eq
        nelements_eq_any: tools.nelements_eq_any
        nelements_neq_any: tools.nelements_neq_any
        volume_max: tools.volume_max
        volume_min: tools.volume_min
        density_max: tools.density_max
        density_min: tools.density_min
        density_atomic_max: tools.density_atomic_max
        density_atomic_min: tools.density_atomic_min
        _page: tools._page
        _per_page: tools._per_page
        _skip: tools._skip
        _limit: tools._limit
        license: tools.license
        _fields: tools._fields
        _all_fields: tools._all_fields
      outputParameters:
      - type: object
        mapping: $.
    - name: post-findstructure-documents
      description: Post FindStructure documents
      hints:
        readOnly: false
        destructive: false
        idempotent: false
      call: materials-project-materials.searchmaterialscorefindstructurepost
      with:
        ltol: tools.ltol
        stol: tools.stol
        angle_tol: tools.angle_tol
        _limit: tools._limit
        body: tools.body
      outputParameters:
      - type: object
        mapping: $.
    - name: get-formulaautocomplete-documents
      description: Get FormulaAutocomplete documents
      hints:
        readOnly: true
        destructive: false
        idempotent: true
      call: materials-project-materials.searchmaterialscoreformulaautocompleteget
      with:
        formula: tools.formula
        limit: tools.limit
      outputParameters:
      - type: object
        mapping: $.