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a2a2p — Agent-to-Agent-to-Physical

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revise_requirement

Create a new, immutable revision of a prior request by applying only the fields you learned since the first submission. Use this after review_specification returns a clarification_plan: provide the original request_id plus the patch (for example intent.geometric_envelope or specification.material). The original is preserved; the revision receives a new request_id, a fresh spec_review, a revision_of link, and a deterministic readiness_progress comparison against its immediate predecessor. Provide idempotency_key when retrying the same patch so a network retry returns the same revision instead of creating another.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
intentNoLayer 1 — the problem. What the physical matter needs to DO. Use this for intent-driven requests where the agent describes purpose and a2a2p recommends solutions.
contactNoOptional email or callback endpoint for quote delivery.
deadlineNoRequired delivery date or timeframe. Maps to intent.timeline.
quantityNoNumber of units needed. Maps to intent.quantity.
budget_usdNoApproximate budget in USD. Maps to intent.budget_envelope.
request_idYesThe prior request_id to revise.
constraintsNoHard constraints: tolerances, certifications, materials to avoid, size/weight limits. Maps to intent.functional_requirements.
requirementNoPlain-language description of the physical need. Maps to intent.purpose. Include function, dimensions, materials, load/performance requirements, environment, and interfaces where known.
callback_urlNoOptional HTTPS URL. When the quote is ready, a2a2p POSTs it as JSON to this URL.
revision_noteNoOptional short explanation of what changed.
specificationNoLayer 2 — the solution. What the physical matter IS. Populate what is known. Precise specifications produce faster, tighter quotes. Controlled vocabularies are preferred but open values are accepted.
idempotency_keyNoOptional stable retry key (1–128 characters). Reusing it with the same patch returns the prior revision; reuse with a different patch is rejected.
business_contextNoOptional business requirements (expected volumes, cost targets, ROI constraints). If provided, the quote includes a business case.
rejected_alternativesNoOptions already considered and ruled out. Prevents re-suggesting and builds the learning corpus.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed9 schema fields changed
    • addedInput schema / properties / intent / properties / alternates_acceptable
      Added value: +{
+  "description": "Whether a supplier may propose a different material, process or stock size.",
+  "type": [
+    "boolean",
+    "string"
+  ]
+}
    • addedInput schema / properties / intent / properties / inspection_documents
      Added value: +{
+  "description": "Inspection or material documents required with the parts, or \"none required\".",
+  "type": "string"
+}
    • addedInput schema / properties / intent / properties / quote_by
      Added value: +{
+  "description": "Date a quote is needed by.",
+  "type": "string"
+}
    • addedInput schema / properties / intent / properties / ship_to_region
      Added value: +{
+  "description": "Delivery region. When present, a supplier package asks for a price including freight to it; when absent, freight is excluded.",
+  "type": "string"
+}
    • addedInput schema / properties / specification / properties / cutting
      Added value: +{
+  "description": "Cutting-tool constraints for routed or milled profiles.",
+  "properties": {
+    "inside_corner_relief": {
+      "description": "dogbone or t_bone: the supplier adds that relief; in_file: relief is already drawn; not_required: tool-radius corners are acceptable.",
+      "enum": [
+        "dogbone",
+        "t_bone",
+        "in_file",
+        "not_required"
+      ],
+      "type": "string"
+    },
+    "tool_diameter_mm": {
+      "description": "Smallest cutter that will be used. Inside corners and holes with a smaller radius are flagged against the measured DXF.",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    }
+  },
+  "type": "object"
+}
    • addedInput schema / properties / specification / properties / notes
      Added value: +{
+  "description": "Manufacturing notes for the supplier. Carried verbatim into the supplier package; never parsed into facts. State anything a check must use in its structured field.",
+  "maxLength": 4000,
+  "type": "string"
+}
    • changedInput schema / properties / specification / properties / process / enum
      Previous value: -[
-  "cnc_milling",
-  "cnc_turning",
-  "fdm_3d_print",
-  "sla_3d_print",
-  "sls_3d_print",
-  "sheet_metal",
-  "laser_cutting",
-  "casting",
-  "injection_molding",
-  "extrusion"
-]New value: +[
+  "cnc_milling",
+  "cnc_turning",
+  "cnc_routing",
+  "fdm_3d_print",
+  "sla_3d_print",
+  "sls_3d_print",
+  "sheet_metal",
+  "laser_cutting",
+  "casting",
+  "injection_molding",
+  "extrusion"
+]
    • addedInput schema / properties / specification / properties / sheet_stock
      Added value: +{
+  "description": "The sheet a flat part is cut from. For plywood a supplier needs face_grade, nominal and actual thickness, ply_count and glue_class; for MDF, grade and thickness. Missing facts are asked, never chosen by a2a2p.",
+  "properties": {
+    "actual_thickness_mm": {
+      "anyOf": [
+        {
+          "exclusiveMinimum": 0,
+          "type": "number"
+        },
+        {
+          "properties": {
+            "max": {
+              "type": "number"
+            },
+            "min": {
+              "type": "number"
+            }
+          },
+          "type": "object"
+        }
+      ],
+      "description": "Measured or specified actual thickness. Stock-relative tolerances also satisfy this: the joint follows the sheet."
+    },
+    "face_grade": {
+      "description": "Face/back veneer grade, for example B/BB.",
+      "type": "string"
+    },
+    "glue_class": {
+      "description": "Bond class, for example EN 314-2 class 1 (interior) or class 3 (exterior).",
+      "type": "string"
+    },
+    "grade": {
+      "description": "Panel grade for MDF and similar boards, for example standard or moisture_resistant.",
+      "type": "string"
+    },
+    "grain_direction": {
+      "description": "Face-grain direction relative to the declared X/Y dimensions.",
+      "enum": [
+        "along_x",
+        "along_y",
+        "not_applicable"
+      ],
+      "type": "string"
+    },
+    "nominal_thickness_mm": {
+      "exclusiveMinimum": 0,
+      "type": "number"
+    },
+    "ply_count": {
+      "minimum": 1,
+      "type": "integer"
+    }
+  },
+  "type": "object"
+}
    • addedInput schema / properties / specification / properties / tolerances
      Added value: +{
+  "additionalProperties": {
+    "anyOf": [
+      {
+        "exclusiveMinimum": 0,
+        "type": "number"
+      },
+      {
+        "properties": {
+          "allowance_mm": {
+            "description": "Added to the measured stock thickness; negative for an interference fit.",
+            "type": "number"
+          },
+          "fit_class": {
+            "description": "Optional label such as push_fit or press_fit.",
+            "type": "string"
+          },
+          "minus": {
+            "minimum": 0,
+            "type": "number"
+          },
+          "nominal": {
+            "exclusiveMinimum": 0,
+            "type": "number"
+          },
+          "plus": {
+            "minimum": 0,
+            "type": "number"
+          },
+          "relative_to": {
+            "enum": [
+              "measured_stock_thickness"
+            ],
+            "type": "string"
+          },
+          "unit": {
+            "type": "string"
+          },
+          "value": {
+            "exclusiveMinimum": 0,
+            "type": "number"
+          }
+        },
+        "type": "object"
+      }
+    ]
+  },
+  "description": "Exact numeric tolerance callouts keyed by feature. They govern over tolerance_class for the named feature. Forms: a positive number (plus or minus that amount); { nominal, plus, minus }; or a stock-relative rule { relative_to: \"measured_stock_thickness\", allowance_mm, plus, minus, fit_class } for joints cut to the sheet actually used.",
+  "type": "object"
+}
  2. Changed1 schema field changed
    • changedInput schema / properties / specification / properties / process / enum
      Previous value: -[
-  "cnc_milling",
-  "cnc_turning",
-  "fdm_3d_print",
-  "sla_3d_print",
-  "sls_3d_print",
-  "sheet_metal",
-  "casting",
-  "injection_molding",
-  "extrusion"
-]New value: +[
+  "cnc_milling",
+  "cnc_turning",
+  "fdm_3d_print",
+  "sla_3d_print",
+  "sls_3d_print",
+  "sheet_metal",
+  "laser_cutting",
+  "casting",
+  "injection_molding",
+  "extrusion"
+]
  3. Changed1 schema field changed
    • addedInput schema / properties / intent / properties / functional_requirements / properties / load_case / properties / allowable_shear_stress_mpa
      Added value: +{
+  "description": "Optional requester-supplied transverse-shear design allowable; evaluated independently and never inferred from handbook data.",
+  "exclusiveMinimum": 0,
+  "type": "number"
+}
  4. Changed5 schema fields changed
    • changedInput schema / properties / intent / properties / purpose / description
      Previous value: -"What the physical matter needs to accomplish (one line minimum, required)."New value: +"What the physical matter needs to accomplish (one non-whitespace line minimum, required)."
    • addedInput schema / properties / intent / properties / purpose / minLength
      Added value: +1
    • addedInput schema / properties / intent / properties / purpose / pattern
      Added value: +"\\S"
    • addedInput schema / properties / requirement / minLength
      Added value: +1
    • addedInput schema / properties / requirement / pattern
      Added value: +"\\S"
  5. Changed4 schema fields changed
    • changedInput schema / properties / specification / properties / design_files / description
      Previous value: -"STEP/STL/DXF file references."New value: +"Temporary or externally hosted manufacturing file references ({url, format, optional role}). Accepted upload aliases: stl, step, stp, dxf, pdf; shared downstream ceiling: 8388608 bytes."
    • addedInput schema / properties / specification / properties / design_files / items / properties / format / enum
      Added value: +[
+  "stl",
+  "step",
+  "stp",
+  "dxf",
+  "pdf"
+]
    • addedInput schema / properties / specification / properties / design_files / items / properties / role
      Added value: +{
+  "enum": [
+    "geometry",
+    "drawing",
+    "reference"
+  ],
+  "type": "string"
+}
    • addedInput schema / properties / specification / properties / design_files / items / required
      Added value: +[
+  "url",
+  "format"
+]
  6. Changed4 schema fields changed
    • addedInput schema / properties / intent / properties / functional_requirements / properties / load_case
      Added value: +{
+  "description": "Optional bounded structural sanity check. State an explicit static point-load model and rectangular section; height_mm is the bending direction.",
+  "properties": {
+    "allowable_stress_mpa": {
+      "description": "Optional requester-supplied design allowable; never inferred from handbook yield.",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    },
+    "elastic_modulus_gpa": {
+      "description": "Optional requester-supplied Young's modulus. Otherwise the matched material handbook reference is used and labeled.",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    },
+    "load_n": {
+      "description": "Static point-load magnitude in Newtons.",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    },
+    "max_deflection_mm": {
+      "description": "Optional requester-supplied acceptance limit.",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    },
+    "minimum_factor_of_safety": {
+      "description": "Optional acceptance criterion; evaluated only with requester-supplied yield_strength_mpa.",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    },
+    "model": {
+      "description": "Supported deterministic models: cantilever_end_load or simply_supported_center_load. Other values are preserved but reported as unsupported.",
+      "examples": [
+        "cantilever_end_load",
+        "simply_supported_center_load"
+      ],
+      "type": "string"
+    },
+    "section": {
+      "properties": {
+        "height_mm": {
+          "description": "Rectangular section depth in the bending direction, millimetres.",
+          "exclusiveMinimum": 0,
+          "type": "number"
+        },
+        "width_mm": {
+          "description": "Rectangular section width in millimetres.",
+          "exclusiveMinimum": 0,
+          "type": "number"
+        }
+      },
+      "required": [
+        "width_mm",
+        "height_mm"
+      ],
+      "type": "object"
+    },
+    "span_mm": {
+      "description": "Beam span in millimetres.",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    },
+    "yield_strength_mpa": {
+      "description": "Optional exact grade/condition/product-form datasheet value supplied by the requester.",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    }
+  },
+  "required": [
+    "model",
+    "load_n",
+    "span_mm",
+    "section"
+  ],
+  "type": "object"
+}
    • changedInput schema / properties / intent / properties / functional_requirements / properties / max_load / description
      Previous value: -"Maximum load in Newtons."New value: +"Maximum load magnitude. A Newton scalar is preferred; { value, unit: \"N\" } remains accepted."
    • addedInput schema / properties / intent / properties / functional_requirements / properties / max_load / oneOf
      Added value: +[
+  {
+    "exclusiveMinimum": 0,
+    "type": "number"
+  },
+  {
+    "properties": {
+      "unit": {
+        "description": "Force unit; N is canonical.",
+        "type": "string"
+      },
+      "value": {
+        "exclusiveMinimum": 0,
+        "type": "number"
+      }
+    },
+    "required": [
+      "value"
+    ],
+    "type": "object"
+  }
+]
    • removedInput schema / properties / intent / properties / functional_requirements / properties / max_load / type
      Removed value: -"number"
  7. Added

TDQS

A4.6/5.0
Behavior5/5

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

With no annotations, the description carries the full behavioral burden and does so well: it discloses immutability ('the original is preserved'), the concrete side effects (new request_id, fresh spec_review, revision_of link, readiness_progress comparison), and retry semantics via idempotency_key. That is exactly the kind of mutation/retry context an agent needs before calling.

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?

Three sentences, front-loaded with the core action and trigger before the side-effect inventory. The third sentence is dense with a four-item list, but each item conveys information the agent would otherwise have to discover empirically.

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?

For a 14-parameter mutation tool with no output schema and no annotations, the description covers the essentials: what is mutated, what is preserved, what the response contains (new id, spec_review, revision_of, readiness_progress), and how retries are deduplicated. Nothing an agent needs in order to call it correctly is missing.

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 the schema already documents all 14 parameters; baseline is 3. The description goes beyond it by illustrating the shape of a patch ('for example intent.geometric_envelope or specification.material') and by restating the idempotency contract, which clarifies how request_id and the partial patch interact.

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 and resource — creating a new, immutable revision of a prior request — and pins the mechanism ('applying only the fields you learned since the first submission'). This distinguishes it from request_physical_solution (new request) and from review_specification, which it explicitly references.

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 a clear trigger condition: 'Use this after review_specification returns a clarification_plan', which tells the agent exactly when this tool fires. It does not, however, state the counter-case (e.g. use request_physical_solution when there is no prior request_id to revise), so the agent must infer the alternative.

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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