a2a2p — Agent-to-Agent-to-Physical

follow_co_invention_session

follow 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>"
    },
    "name": "follow_co_invention_session"
  }
}

Input Schema

Name	Required	Description	Default
`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

C2.9/5.0

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 disclose useful traits: the token authorizes both reading and changing the session, only its SHA-256 digest is stored, and it must be kept secret. However, it does not say what calling the tool returns or what "follow" does operationally, so the mutation/read boundary and effects remain partly opaque.

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?

Four short sentences, front-loaded with the action and immediately followed by scope exclusions and the credential warning. No filler; the only weakness is that brevity partly comes at the expense of defining "follow".

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

Completeness3/5

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

An output schema exists, so return values need not be explained, and the token handling is covered. What is missing is the core semantic of the operation itself and any relationship to the other session tools, which for a two-parameter unannotated session tool is a meaningful gap.

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%, so the description must compensate. It gives real meaning for follow_token (private credential granting read/change, stored only as a digest, keep secret) beyond the regex pattern, but says nothing about session_id beyond what its name implies. Partial compensation justifies a 3 rather than lower.

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?

"Follow a free co-invention session" names a verb and resource but never defines what following actually does (poll? retrieve state? subscribe?). The scoping sentences ("Free concept selection only. No research, model run, payment...") bound what it is not, but the positive purpose stays undefined and no distinction is drawn from siblings like steer_co_invention_session or feed_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 when-to-use guidance and no mention of alternatives, even though five sibling tools operate on the same session lifecycle. At best, "Free concept selection only" implies a narrow usage context, but nothing tells the agent when to pick follow over steer, feed, decide, or end.

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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