a2a2p — Agent-to-Agent-to-Physical

feed_co_invention_session

feed a free co-invention session. Free concept selection only. No research, model run, payment, procurement or manufacture is started. The private follow token authorizes agents to read and change this session. Only its SHA-256 digest is stored. Keep it secret.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "session_id": "<session_id>",
      "follow_token": "<follow_token>",
      "actor": "<actor>",
      "concepts": "<concepts>"
    },
    "name": "feed_co_invention_session"
  }
}

Input Schema

Name	Required	Description	Default
`actor`	Yes
`concepts`	Yes
`session_id`	Yes
`follow_token`	Yes

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 28, 2026

changedOutput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "concepts": {
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "decision": {
-              "oneOf": [
-                {
-                  "type": "null"
-                },
-                {
-                  "additionalProperties": true,
-                  "properties": {
-                    "at": {
-                      "maxLength": 100,
-                      "minLength": 1,
-                      "pattern": "\\S",
-                      "type": "string"
-                    },
-                    "by": {
-                      "additionalProperties": true,
-                      "properties": {
-                        "kind": {
-                          "enum": [
-                            "person",
-                            "agent",
-                            "debbie"
-                          ]
-                        },
-                        "name": {
-                          "maxLength": 80,
-                          "minLength": 1,
-                          "pattern": "\\S",
-                          "type": "string"
-                        },
-                        "untrusted": {
-                          "type": "boolean"
-                        }
-                      },
-                      "required": [
-                        "kind"
-                      ],
-                      "type": "object"
-                    },
-                    "reason": {
-                      "maxLength": 400,
-                      "minLength": 1,
-                      "pattern": "\\S",
-                      "type": "string"
-                    }
-                  },
-                  "required": [
-                    "by",
-                    "reason",
-                    "at"
-                  ],
-                  "type": "object"
-                }
-              ]
-            },
-            "id": {
-              "maxLength": 100,
-              "minLength": 1,
-              "pattern": "\\S",
-              "type": "string"
-            },
-            "job": {
-              "oneOf": [
-                {
-                  "type": "null"
-                },
-                {
-                  "description": "deb8 job reference, if any; this adapter cannot start a job",
-                  "type": "object"
-                }
-              ]
-            },
-            "looksLikeInstruction": {
-              "type": "boolean"
-            },
-            "material": {
-              "maxLength": 3878,
-              "minLength": 1,
-              "pattern": "\\S",
-              "type": "string"
-            },
-            "provenance": {
-              "additionalProperties": true,
-              "properties": {
-                "derivedFrom": {
-                  "oneOf": [
-                    {
-                      "type": "null"
-                    },
-                    {
-                      "maxLength": 100,
-                      "minLength": 1,
-                      "pattern": "\\S",
-                      "type": "string"
-                    }
-                  ]
-                },
-                "materialDigest": {
-                  "maxLength": 64,
-                  "minLength": 64,
-                  "pattern": "\\S",
-                  "type": "string"
-                },
-                "receivedAt": {
-                  "maxLength": 100,
-                  "minLength": 1,
-                  "pattern": "\\S",
-                  "type": "string"
-                },
-                "via": {
-                  "enum": [
-                    "api",
-                    "connector",
-                    "workspace",
-                    "deb8"
-                  ]
-                }
-              },
-              "required": [
-                "via",
-                "derivedFrom",
-                "materialDigest",
-                "receivedAt"
-              ],
-              "type": "object"
-            },
-            "sessionId": {
-              "maxLength": 100,
-              "minLength": 1,
-              "pattern": "\\S",
-              "type": "string"
-            },
-            "source": {
-              "additionalProperties": true,
-              "properties": {
-                "kind": {
-                  "enum": [
-                    "person",
-                    "agent",
-                    "debbie"
-                  ]
-                },
-                "name": {
-                  "maxLength": 80,
-                  "minLength": 1,
-                  "pattern": "\\S",
-                  "type": "string"
-                },
-                "untrusted": {
-                  "type": "boolean"
-                }
-              },
-              "required": [
-                "kind"
-              ],
-              "type": "object"
-            },
-            "state": {
-              "enum": [
-                "proposed",
-                "accepted",
-                "rejected"
-              ]
-            },
-            "title": {
-              "maxLength": 120,
-              "minLength": 1,
-              "pattern": "\\S",
-              "type": "string"
-            },
-            "version": {
-              "minimum": 1,
-              "type": "integer"
-            }
-          },
-          "required": [
-            "id",
-            "sessionId",
-            "title",
-            "material",
-            "looksLikeInstruction",
-            "source",
-            "provenance",
-            "state",
-            "decision",
-            "job",
-            "version"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "contract": {
-        "const": "a2a2p.co-invention/1.0.0"
-      },
-      "follow_token": {
-        "maxLength": 64,
-        "minLength": 1,
-        "pattern": "\\S",
-        "type": "string"
-      },
-      "follow_url": {
-        "maxLength": 300,
-        "minLength": 1,
-        "pattern": "\\S",
-        "type": "string"
-      },
-      "next": {
-        "maxLength": 1000,
-        "minLength": 1,
-        "pattern": "\\S",
-        "type": "string"
-      },
-      "session": {
-        "additionalProperties": true,
-        "properties": {
-          "agent": {
-            "additionalProperties": false,
-            "properties": {
-              "name": {
-                "maxLength": 40,
-                "minLength": 1,
-                "pattern": "\\S",
-                "type": "string"
-              },
-              "platform": {
-                "maxLength": 36,
-                "minLength": 1,
-                "pattern": "\\S",
-                "type": "string"
-              }
-            },
-            "required": [
-              "name",
-              "platform"
-            ],
-            "type": "object"
-          },
-          "domain": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "\\S",
-            "type": "string"
-          },
-          "id": {
-            "maxLength": 100,
-            "minLength": 1,
-            "pattern": "\\S",
-            "type": "string"
-          },
-          "idea": {
-            "maxLength": 1750,
-            "minLength": 15,
-            "pattern": "\\S",
-            "type": "string"
-          },
-          "revision": {
-            "minimum": 1,
-            "type": "integer"
-          },
-          "state": {
-            "enum": [
-              "open",
-              "ended"
-            ]
-          }
-        },
-        "required": [
-          "id",
-          "idea",
-          "domain",
-          "agent",
-          "state",
-          "revision"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "contract",
-      "session",
-      "concepts",
-      "next"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "code": {
-        "const": "rate_limited"
-      },
-      "contract": {
-        "const": "a2a2p.co-invention/1.0.0"
-      },
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "maxLength": 80,
-            "minLength": 1,
-            "pattern": "\\S",
-            "type": "string"
-          },
-          "message": {
-            "maxLength": 1000,
-            "minLength": 1,
-            "pattern": "\\S",
-            "type": "string"
-          }
-        },
-        "required": [
-          "code",
-          "message"
-        ],
-        "type": "object"
-      },
-      "rate_limit": {
-        "description": "a2a2p.rate-limit/2.0.0 receipt",
-        "type": "object"
-      }
-    },
-    "required": [
-      "contract",
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "concepts": {
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "decision": {
+              "oneOf": [
+                {
+                  "type": "null"
+                },
+                {
+                  "additionalProperties": true,
+                  "properties": {
+                    "at": {
+                      "maxLength": 100,
+                      "minLength": 1,
+                      "pattern": "\\S",
+                      "type": "string"
+                    },
+                    "by": {
+                      "additionalProperties": true,
+                      "properties": {
+                        "kind": {
+                          "enum": [
+                            "person",
+                            "agent",
+                            "debbie"
+                          ]
+                        },
+                        "name": {
+                          "maxLength": 80,
+                          "minLength": 1,
+                          "pattern": "\\S",
+                          "type": "string"
+                        },
+                        "untrusted": {
+                          "type": "boolean"
+                        }
+                      },
+                      "required": [
+                        "kind"
+                      ],
+                      "type": "object"
+                    },
+                    "reason": {
+                      "maxLength": 400,
+                      "minLength": 1,
+                      "pattern": "\\S",
+                      "type": "string"
+                    }
+                  },
+                  "required": [
+                    "by",
+                    "reason",
+                    "at"
+                  ],
+                  "type": "object"
+                }
+              ]
+            },
+            "id": {
+              "maxLength": 100,
+              "minLength": 1,
+              "pattern": "\\S",
+              "type": "string"
+            },
+            "job": {
+              "oneOf": [
+                {
+                  "type": "null"
+                },
+                {
+                  "description": "deb8 job reference, if any; this adapter cannot start a job",
+                  "type": "object"
+                }
+              ]
+            },
+            "looksLikeInstruction": {
+              "type": "boolean"
+            },
+            "material": {
+              "maxLength": 3878,
+              "minLength": 1,
+              "pattern": "\\S",
+              "type": "string"
+            },
+            "provenance": {
+              "additionalProperties": true,
+              "properties": {
+                "derivedFrom": {
+                  "oneOf": [
+                    {
+                      "type": "null"
+                    },
+                    {
+                      "maxLength": 100,
+                      "minLength": 1,
+                      "pattern": "\\S",
+                      "type": "string"
+                    }
+                  ]
+                },
+                "materialDigest": {
+                  "maxLength": 64,
+                  "minLength": 64,
+                  "pattern": "\\S",
+                  "type": "string"
+                },
+                "receivedAt": {
+                  "maxLength": 100,
+                  "minLength": 1,
+                  "pattern": "\\S",
+                  "type": "string"
+                },
+                "via": {
+                  "enum": [
+                    "api",
+                    "connector",
+                    "workspace",
+                    "deb8"
+                  ]
+                }
+              },
+              "required": [
+                "via",
+                "derivedFrom",
+                "materialDigest",
+                "receivedAt"
+              ],
+              "type": "object"
+            },
+            "sessionId": {
+              "maxLength": 100,
+              "minLength": 1,
+              "pattern": "\\S",
+              "type": "string"
+            },
+            "source": {
+              "additionalProperties": true,
+              "properties": {
+                "kind": {
+                  "enum": [
+                    "person",
+                    "agent",
+                    "debbie"
+                  ]
+                },
+                "name": {
+                  "maxLength": 80,
+                  "minLength": 1,
+                  "pattern": "\\S",
+                  "type": "string"
+                },
+                "untrusted": {
+                  "type": "boolean"
+                }
+              },
+              "required": [
+                "kind"
+              ],
+              "type": "object"
+            },
+            "state": {
+              "enum": [
+                "proposed",
+                "accepted",
+                "rejected"
+              ]
+            },
+            "title": {
+              "maxLength": 120,
+              "minLength": 1,
+              "pattern": "\\S",
+              "type": "string"
+            },
+            "version": {
+              "minimum": 1,
+              "type": "integer"
+            }
+          },
+          "required": [
+            "id",
+            "sessionId",
+            "title",
+            "material",
+            "looksLikeInstruction",
+            "source",
+            "provenance",
+            "state",
+            "decision",
+            "job",
+            "version"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "contract": {
+        "const": "a2a2p.co-invention/1.1.0"
+      },
+      "follow_token": {
+        "maxLength": 64,
+        "minLength": 1,
+        "pattern": "\\S",
+        "type": "string"
+      },
+      "follow_url": {
+        "maxLength": 300,
+        "minLength": 1,
+        "pattern": "\\S",
+        "type": "string"
+      },
+      "next": {
+        "maxLength": 1000,
+        "minLength": 1,
+        "pattern": "\\S",
+        "type": "string"
+      },
+      "session": {
+        "additionalProperties": true,
+        "properties": {
+          "agent": {
+            "additionalProperties": false,
+            "properties": {
+              "name": {
+                "maxLength": 40,
+                "minLength": 1,
+                "pattern": "\\S",
+                "type": "string"
+              },
+              "platform": {
+                "maxLength": 36,
+                "minLength": 1,
+                "pattern": "\\S",
+                "type": "string"
+              }
+            },
+            "required": [
+              "name",
+              "platform"
+            ],
+            "type": "object"
+          },
+          "domain": {
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "\\S",
+            "type": "string"
+          },
+          "id": {
+            "maxLength": 100,
+            "minLength": 1,
+            "pattern": "\\S",
+            "type": "string"
+          },
+          "idea": {
+            "maxLength": 1750,
+            "minLength": 15,
+            "pattern": "\\S",
+            "type": "string"
+          },
+          "revision": {
+            "minimum": 1,
+            "type": "integer"
+          },
+          "state": {
+            "enum": [
+              "open",
+              "ended"
+            ]
+          }
+        },
+        "required": [
+          "id",
+          "idea",
+          "domain",
+          "agent",
+          "state",
+          "revision"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "contract",
+      "session",
+      "concepts",
+      "next"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "code": {
+        "const": "rate_limited"
+      },
+      "contract": {
+        "const": "a2a2p.co-invention/1.1.0"
+      },
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "maxLength": 80,
+            "minLength": 1,
+            "pattern": "\\S",
+            "type": "string"
+          },
+          "message": {
+            "maxLength": 1000,
+            "minLength": 1,
+            "pattern": "\\S",
+            "type": "string"
+          }
+        },
+        "required": [
+          "code",
+          "message"
+        ],
+        "type": "object"
+      },
+      "rate_limit": {
+        "description": "a2a2p.rate-limit/2.0.0 receipt",
+        "type": "object"
+      }
+    },
+    "required": [
+      "contract",
+      "error"
+    ],
+    "type": "object"
+  }
+]

AddedOct 26, 2026

TDQS

B3/5.0

Behavior3/5

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

With no annotations, the description carries the full burden and does useful work: it enumerates what is NOT triggered (research, model run, payment, procurement, manufacture), states the token grants read/change authority, and notes only a SHA-256 digest is stored. It still omits idempotency, error behavior, and any limit on repeated feeds, so it stops short of full disclosure.

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?

Five short sentences, front-loaded with purpose then safety boundaries. The fragmentary style is efficient; only the repeated negative list borders on enumerating schema-level concerns rather than agent-relevant ones.

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?

For a mutation tool with no annotations, the description covers the side-effect boundary and secret handling that an agent most needs before calling, and an output schema exists to cover return values. The remaining gap is the shape and semantics of the concepts payload, which neither schema nor description explains.

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 0% with four required parameters, so the description must compensate. It adds real meaning for follow_token (secret, digest-only storage, grants read/change), but says nothing about session_id, the actor person/agent union, or the concepts array including maxItems of 12 and derivedFrom.

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

Purpose3/5

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

"feed a free co-invention session" names the resource but the verb "feed" is idiosyncratic, and "Free concept selection only" is the only hint at what is actually submitted. It never distinguishes this tool from sibling session operations such as steer_co_invention_session, follow_co_invention_session, or decide_co_invention_session.

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 explicit statement of when to call this versus the other five session tools. "Free concept selection only" and the token sentence imply context but leave the agent to infer that this submits concepts rather than steering, reading, or deciding a session.

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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