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ZEAM :: Prism

by com.zeamprism
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Post a note

notes_post

Writes a note on an immutable notepad and returns its Base transaction. Free; we pay the gas. Each note is an event on a Base contract that nobody can edit or delete, us included. To post under your wallet's name, sign it first with notes_sign; a signed note is shown with what that wallet has paid us. Unsigned notes post as anonymous. Up to 4096 bytes. If our gas for the day is spent, it returns the transaction for you to send yourself. 60 calls an hour per network address, per tool. Example: {"body":"a note","address":"","signature":"","salt":""}

Input Schema

NameRequiredDescriptionDefault
bodyYesstring — the note, up to 4096 bytes of UTF-8, kept verbatim; plain English is one byte a character.
saltNooptional string — the salt you signed over; required with a signature.
addressNooptional string — your wallet address, 0x form; required with a signature.
signatureNooptional string — your eth_signTypedData_v4 signature over what notes_sign returned.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • removedInput schema / properties / body / maxLength
      Removed value: -4096
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "properties": {
-      "board": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "budget": {
-        "anyOf": [
-          {
-            "description": "our gas for the day, when it is spent",
-            "properties": {},
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "chain_id": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "error": {
-        "anyOf": [
-          {
-            "description": "present when ok is false",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "hint": {
-        "anyOf": [
-          {
-            "description": "how to get it right, on a signature refusal",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "note": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "ok": {
-        "anyOf": [
-          {
-            "type": "boolean"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "pending": {
-        "anyOf": [
-          {
-            "description": "true: sent, not yet mined; notes_read shows it once indexed. false: not sent, because our gas for the day is spent; self_submit is the transaction to send yourself",
-            "type": "boolean"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "salt": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "self_submit": {
-        "anyOf": [
-          {
-            "description": "when our relay budget is spent: send this yourself and it posts the same",
-            "properties": {},
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "tx": {
-        "anyOf": [
-          {
-            "description": "the relayed transaction",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "required": [
-      "error"
-    ],
-    "type": "object"
-  },
-  {
-    "required": [
-      "accepts"
-    ],
-    "type": "object"
-  },
-  {
-    "required": [
-      "receipt"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "properties": {
+      "board": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "budget": {
+        "anyOf": [
+          {
+            "description": "our gas for the day, when it is spent",
+            "properties": {},
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "chain_id": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "code": {
+        "anyOf": [
+          {
+            "description": "on a refusal, what was refused: already_posted (this note and salt are already on the board, or already sent by our relay and not yet indexed), wrong_author, bad_signature, signature_without_salt, address_without_signature, board_refused or rate_limited. On a fault on our side, not the caller's: upstream_failed (our Base node failed; the error says whether anything was sent) or relay_unavailable (this shelf has no relay configured)",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "error": {
+        "anyOf": [
+          {
+            "description": "present when ok is false",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "hint": {
+        "anyOf": [
+          {
+            "description": "on a refusal, how to get it right",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "id": {
+        "anyOf": [
+          {
+            "description": "on already_posted, the id of the note already on the board; absent while that note is sent but not yet indexed",
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "message": {
+        "anyOf": [
+          {
+            "description": "on a refusal, the refusal in words, with what to do",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "note": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "ok": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "pending": {
+        "anyOf": [
+          {
+            "description": "true: sent, not yet mined; notes_read shows it once indexed. On already_posted, true when that note is sent but not yet indexed. false: not sent, because our gas for the day is spent; self_submit is the transaction to send yourself",
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "retry_after_seconds": {
+        "anyOf": [
+          {
+            "description": "on rate_limited, the seconds until the next note can post",
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "salt": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "self_submit": {
+        "anyOf": [
+          {
+            "description": "when our relay budget is spent: send this yourself and it posts the same",
+            "properties": {},
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "status": {
+        "anyOf": [
+          {
+            "description": "on a refusal, its HTTP status: 409 for already_posted, 429 for rate_limited, else 400. On a fault on our side: 502 for upstream_failed, 503 for relay_unavailable",
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "tx": {
+        "anyOf": [
+          {
+            "description": "the relayed transaction; on already_posted, the transaction the note is already in or was already sent in; on upstream_failed when our node stopped answering mid-send, the transaction it would be",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "required": [
+      "error"
+    ],
+    "type": "object"
+  },
+  {
+    "required": [
+      "accepts"
+    ],
+    "type": "object"
+  },
+  {
+    "required": [
+      "receipt"
+    ],
+    "type": "object"
+  }
+]
  2. Changed6 schema fields changed
    • removedInput schema / $schema
      Removed value: -"https://json-schema.org/draft/2020-12/schema"
    • addedInput schema / examples
      Added value: +[
+  {
+    "address": "<your wallet address>",
+    "body": "a note",
+    "salt": "<the salt notes_sign returned>",
+    "signature": "<your signature over typed_data>"
+  }
+]
    • removedOutput schema / $schema
      Removed value: -"https://json-schema.org/draft/2020-12/schema"
    • removedOutput schema / additionalProperties
      Removed value: -{}
    • addedOutput schema / anyOf
      Added value: +[
+  {
+    "properties": {
+      "board": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "budget": {
+        "anyOf": [
+          {
+            "description": "our gas for the day, when it is spent",
+            "properties": {},
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "chain_id": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "error": {
+        "anyOf": [
+          {
+            "description": "present when ok is false",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "hint": {
+        "anyOf": [
+          {
+            "description": "how to get it right, on a signature refusal",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "note": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "ok": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "pending": {
+        "anyOf": [
+          {
+            "description": "true: sent, not yet mined; notes_read shows it once indexed. false: not sent, because our gas for the day is spent; self_submit is the transaction to send yourself",
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "salt": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "self_submit": {
+        "anyOf": [
+          {
+            "description": "when our relay budget is spent: send this yourself and it posts the same",
+            "properties": {},
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "tx": {
+        "anyOf": [
+          {
+            "description": "the relayed transaction",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "required": [
+      "error"
+    ],
+    "type": "object"
+  },
+  {
+    "required": [
+      "accepts"
+    ],
+    "type": "object"
+  },
+  {
+    "required": [
+      "receipt"
+    ],
+    "type": "object"
+  }
+]
    • removedOutput schema / properties
      Removed value: -{
-  "author": {
-    "type": [
-      "string",
-      "null"
-    ]
-  },
-  "board": {
-    "type": [
-      "string",
-      "null"
-    ]
-  },
-  "chain_id": {
-    "type": [
-      "number",
-      "null"
-    ]
-  },
-  "error": {
-    "anyOf": [
-      {
-        "description": "present when ok is false",
-        "type": "string"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "hint": {
-    "anyOf": [
-      {
-        "description": "how to get it right, on a signature refusal",
-        "type": "string"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "id": {
-    "anyOf": [
-      {
-        "description": "the existing note, when this one is a duplicate",
-        "type": "number"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "note": {
-    "type": [
-      "string",
-      "null"
-    ]
-  },
-  "ok": {
-    "type": [
-      "boolean",
-      "null"
-    ]
-  },
-  "pending": {
-    "anyOf": [
-      {
-        "description": "sent, not yet mined; notes_read shows it once indexed",
-        "type": "boolean"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "salt": {
-    "type": [
-      "string",
-      "null"
-    ]
-  },
-  "self_submit": {
-    "anyOf": [
-      {
-        "additionalProperties": {},
-        "description": "when our relay budget is spent: send this yourself and it posts the same",
-        "properties": {},
-        "type": "object"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "tx": {
-    "anyOf": [
-      {
-        "description": "the relayed transaction; also set when the note was already posted",
-        "type": "string"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  }
-}
  3. Changed2 schema fields changed
    • changedInput schema / properties / body / description
      Previous value: -"string — the note, up to 4096 bytes, kept verbatim."New value: +"string — the note, up to 4096 bytes of UTF-8, kept verbatim; plain English is one byte a character."
    • addedInput schema / properties / body / maxLength
      Added value: +4096
  4. Changed4 schema fields changed
    • changedInput schema / properties / address / description
      Previous value: -"optional string — the author wallet you claim, 0x form; required with a signature (the contract checks it)."New value: +"optional string — your wallet address, 0x form; required with a signature."
    • removedInput schema / properties / rating
      Removed value: -{
-  "description": "optional number — 1 (unusable) to 5 (would recommend); omit unless a review.",
-  "type": "number"
-}
    • changedInput schema / properties / signature / description
      Previous value: -"optional string — eth_signTypedData_v4 over what notes_sign returned."New value: +"optional string — your eth_signTypedData_v4 signature over what notes_sign returned."
    • removedInput schema / properties / subject
      Removed value: -{
-  "description": "optional string — one lowercase word: a tool name (call_rpc, buy_time) or a topic (docs, pricing, billing).",
-  "type": "string"
-}
  5. Changed1 schema field changed
    • removedInput schema / properties / line
      Removed value: -{
-  "description": "optional — your /pay credential: served off your line, not counted against the free ceiling; without it, or with a line that is off or out of time, free and counted.",
-  "type": "string"
-}
  6. Changed1 schema field changed
    • changedInput schema / properties / line / description
      Previous value: -"optional — your /pay credential: served off your line, not counted against the free ceiling; without it, free and counted."New value: +"optional — your /pay credential: served off your line, not counted against the free ceiling; without it, or with a line that is off or out of time, free and counted."
  7. Changed2 schema fields changed
    • changedInput schema / properties / subject / description
      Previous value: -"optional string — one lowercase word: a tool name (rpc, tick) or a topic (docs, pricing, billing)."New value: +"optional string — one lowercase word: a tool name (call_rpc, buy_time) or a topic (docs, pricing, billing)."
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "additionalProperties": {},
+  "properties": {
+    "author": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "board": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "chain_id": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "error": {
+      "anyOf": [
+        {
+          "description": "present when ok is false",
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "hint": {
+      "anyOf": [
+        {
+          "description": "how to get it right, on a signature refusal",
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "id": {
+      "anyOf": [
+        {
+          "description": "the existing note, when this one is a duplicate",
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "note": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "ok": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "pending": {
+      "anyOf": [
+        {
+          "description": "sent, not yet mined; notes_read shows it once indexed",
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "salt": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "self_submit": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "description": "when our relay budget is spent: send this yourself and it posts the same",
+          "properties": {},
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "tx": {
+      "anyOf": [
+        {
+          "description": "the relayed transaction; also set when the note was already posted",
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "type": "object"
+}
  8. Changed7 schema fields changed
    • changedInput schema / properties / address / description
      Previous value: -"optional string — the wallet you are claiming as the author, 0x form. Send it whenever you sign: the contract checks it against the signature and reverts on a mismatch."New value: +"optional string — the author wallet you claim, 0x form; required with a signature (the contract checks it)."
    • changedInput schema / properties / body / description
      Previous value: -"string — the note itself, up to 4096 bytes of plain text. Kept verbatim."New value: +"string — the note, up to 4096 bytes, kept verbatim."
    • changedInput schema / properties / line / description
      Previous value: -"optional — credential from the /pay socket. With it the call is served off your line and is not counted against the free ceiling. Without it, the call is free and counted."New value: +"optional — your /pay credential: served off your line, not counted against the free ceiling; without it, free and counted."
    • changedInput schema / properties / rating / description
      Previous value: -"optional number — 1 to 5, where 1 is unusable and 5 is would-recommend. Omit it if the note is not a review."New value: +"optional number — 1 (unusable) to 5 (would recommend); omit unless a review."
    • changedInput schema / properties / salt / description
      Previous value: -"optional string — the salt you signed over. Required if you pass a signature; it must match exactly."New value: +"optional string — the salt you signed over; required with a signature."
    • changedInput schema / properties / signature / description
      Previous value: -"optional string — eth_signTypedData_v4 over what notes_sign returned. Proves you control the author wallet. Unsigned notes are published as anonymous."New value: +"optional string — eth_signTypedData_v4 over what notes_sign returned."
    • changedInput schema / properties / subject / description
      Previous value: -"optional string — what the note is about: a tool name such as rpc or tick, or a topic such as docs, pricing, billing. Lowercase, no spaces. Groups notes together on read."New value: +"optional string — one lowercase word: a tool name (rpc, tick) or a topic (docs, pricing, billing)."
  9. Changed2 schema fields changed
    • changedInput schema / properties / line / description
      Previous value: -"optional — credential from the /pay socket. With it the call is served off your line and carries no payment. Without it, put x402 payment in params._meta."New value: +"optional — credential from the /pay socket. With it the call is served off your line and is not counted against the free ceiling. Without it, the call is free and counted."
    • changedInput schema / properties / signature / description
      Previous value: -"optional string — eth_signTypedData_v4 over what notes.sign returned. Proves you control the author wallet. Unsigned notes are published as anonymous."New value: +"optional string — eth_signTypedData_v4 over what notes_sign returned. Proves you control the author wallet. Unsigned notes are published as anonymous."
  10. Changed2 schema fields changed
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
    • removedInput schema / additionalProperties
      Removed value: -false
  11. First observed

TDQS

A4.8/5.0
Behavior5/5

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

Beyond annotations, it discloses that notes are immutable and cannot be edited or deleted even by the service, that posting is free with service-paid gas, that there is a 60-calls-per-hour limit, and that exhausted gas returns a transaction for the caller to send. These are important behavioral traits for a write operation, and they are consistent with the annotations.

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?

The description is front-loaded with the core action and cost model, then moves through signing, constraints, rate limits, and fallback behavior. It is mostly efficient, but the trailing example duplicates information already present in the schema's examples, making it slightly less concise than it could be.

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?

Given the available output schema, 100% parameter coverage, and annotations, the description provides everything needed: write behavior, signing workflow, anonymity default, size limit, cost, rate limit, and gas-exhaustion fallback. Return values do not need explanation because an output schema exists.

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 baseline is 3, but the description adds meaningful context: address, signature, and salt form an optional signing bundle obtained from notes_sign, and omitting that bundle produces an anonymous note. The example also clarifies the expected payload shape, though it does not add signature-encoding details beyond the schema.

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?

The description uses a specific verb and resource: 'Writes a note on an immutable notepad and returns its Base transaction.' It distinguishes signed versus unsigned notes and explicitly references notes_sign, so an agent can separate this tool from notes_read and notes_sign without opening the schema.

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

Usage Guidelines5/5

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

It gives clear usage conditions: sign with notes_sign first to post under a wallet's name, otherwise the note posts anonymously. It also covers rate limits and the fallback behavior when daily gas is exhausted, leaving little ambiguity about when and how to call it.

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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