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Pulse Verity

by io.github.pipeworx-io
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Pulse Signed Price

pulse_signed_price
Read-onlyIdempotent

The current CRYPTOGRAPHICALLY SIGNED index price for one crypto asset, from the Pulse Verity Index across thousands of assets and dozens of venues — this result carries a signature you can verify: pass it unchanged to pulse_verify_print to check it OFFLINE, with no network call, against Pulse's public key. Each print carries signature, kid, grade, the number of independent venues (sources), dispersion in basis points and a confidence interval. Grades: consensus (3+ venues) and blended (2) are settleable; indicative (1 venue) is NOT. Use it when a price has to be defensible — settlement, an audit trail, a dispute — not merely current. Requires a Pulse API key via _apiKey. Example: pulse_signed_price({ symbol: "BTC" }).

Input Schema

NameRequiredDescriptionDefault
symbolYesAsset ticker as Pulse spells it, e.g. BTC, ETH, SOL. pulse_asset_catalog lists coverage.
_apiKeyNoPulse Verity API key. Free and self-serve at https://thepulse.markets/developers (60 req/min, 25,000/month, no card).

Output Schema

NameRequiredDescriptionDefault
printYesThe signed price print
sourceYesConstant: Pulse Verity Index (thepulse.markets)
verify_withYesReminder to pass this print unchanged to pulse_verify_print

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • addedInput schema / examples
      Added value: +[
+  {
+    "symbol": "BTC"
+  },
+  {
+    "symbol": "ETH"
+  }
+]
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "properties": {
+    "print": {
+      "description": "The signed price print",
+      "properties": {
+        "at": {
+          "description": "Observation timestamp, 4th field of the signed canonical string",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "cadence": {
+          "description": "Update-frequency metadata for this asset",
+          "properties": {
+            "band": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "calculatedAgeMs": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "newestSourceAgeMs": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "oldestSourceAgeMs": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "p50UpdateMs": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "p95UpdateMs": {
+              "type": [
+                "number",
+                "null"
+              ]
+            }
+          },
+          "type": [
+            "object",
+            "null"
+          ]
+        },
+        "confidence": {
+          "description": "Pulse's confidence score for this observation",
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "dispersionBps": {
+          "description": "Spread across venues in basis points",
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "engine": {
+          "description": "Pulse's pricing engine identifier",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "grade": {
+          "description": "consensus/blended/indicative, 5th field of the signed canonical string",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "grade_note": {
+          "description": "Plain-English meaning of grade and whether it is settleable",
+          "type": "string"
+        },
+        "interval": {
+          "description": "Confidence interval bounds",
+          "properties": {
+            "lower": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "upper": {
+              "type": [
+                "number",
+                "null"
+              ]
+            }
+          },
+          "type": [
+            "object",
+            "null"
+          ]
+        },
+        "kid": {
+          "description": "Key id selecting which public key verifies the signature",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "price": {
+          "description": "Price as a float; priceText is what was actually signed",
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "priceText": {
+          "description": "Price exactly as served, 3rd field of the signed canonical string",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "settleable": {
+          "description": "True only for consensus/blended grades",
+          "type": "boolean"
+        },
+        "sig": {
+          "description": "Signing scheme tag, 1st field of the canonical string (pulse-index-v1)",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "signature": {
+          "description": "Base64 ECDSA P-256 signature over the canonical string",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "sources": {
+          "description": "Count of independent venues contributing",
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "symbol": {
+          "description": "Asset ticker, 2nd field of the signed canonical string",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "tier": {
+          "description": "Same value as grade",
+          "type": [
+            "string",
+            "null"
+          ]
+        }
+      },
+      "type": "object"
+    },
+    "source": {
+      "description": "Constant: Pulse Verity Index (thepulse.markets)",
+      "type": "string"
+    },
+    "verify_with": {
+      "description": "Reminder to pass this print unchanged to pulse_verify_print",
+      "type": "string"
+    }
+  },
+  "required": [
+    "print",
+    "verify_with",
+    "source"
+  ],
+  "type": "object"
+}
  2. Changed2 schema fields changed
    • removedInput schema / examples
      Removed value: -[
-  {
-    "symbol": "BTC"
-  },
-  {
-    "symbol": "ETH"
-  }
-]
    • changedOutput schema / (root)
      Previous value: -{
-  "properties": {
-    "print": {
-      "description": "The signed price print",
-      "properties": {
-        "at": {
-          "description": "Observation timestamp, 4th field of the signed canonical string",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "cadence": {
-          "description": "Update-frequency metadata for this asset",
-          "properties": {
-            "band": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "calculatedAgeMs": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "newestSourceAgeMs": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "oldestSourceAgeMs": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "p50UpdateMs": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "p95UpdateMs": {
-              "type": [
-                "number",
-                "null"
-              ]
-            }
-          },
-          "type": [
-            "object",
-            "null"
-          ]
-        },
-        "confidence": {
-          "description": "Pulse's confidence score for this observation",
-          "type": [
-            "number",
-            "null"
-          ]
-        },
-        "dispersionBps": {
-          "description": "Spread across venues in basis points",
-          "type": [
-            "number",
-            "null"
-          ]
-        },
-        "engine": {
-          "description": "Pulse's pricing engine identifier",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "grade": {
-          "description": "consensus/blended/indicative, 5th field of the signed canonical string",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "grade_note": {
-          "description": "Plain-English meaning of grade and whether it is settleable",
-          "type": "string"
-        },
-        "interval": {
-          "description": "Confidence interval bounds",
-          "properties": {
-            "lower": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "upper": {
-              "type": [
-                "number",
-                "null"
-              ]
-            }
-          },
-          "type": [
-            "object",
-            "null"
-          ]
-        },
-        "kid": {
-          "description": "Key id selecting which public key verifies the signature",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "price": {
-          "description": "Price as a float; priceText is what was actually signed",
-          "type": [
-            "number",
-            "null"
-          ]
-        },
-        "priceText": {
-          "description": "Price exactly as served, 3rd field of the signed canonical string",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "settleable": {
-          "description": "True only for consensus/blended grades",
-          "type": "boolean"
-        },
-        "sig": {
-          "description": "Signing scheme tag, 1st field of the canonical string (pulse-index-v1)",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "signature": {
-          "description": "Base64 ECDSA P-256 signature over the canonical string",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "sources": {
-          "description": "Count of independent venues contributing",
-          "type": [
-            "number",
-            "null"
-          ]
-        },
-        "symbol": {
-          "description": "Asset ticker, 2nd field of the signed canonical string",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "tier": {
-          "description": "Same value as grade",
-          "type": [
-            "string",
-            "null"
-          ]
-        }
-      },
-      "type": "object"
-    },
-    "source": {
-      "description": "Constant: Pulse Verity Index (thepulse.markets)",
-      "type": "string"
-    },
-    "verify_with": {
-      "description": "Reminder to pass this print unchanged to pulse_verify_print",
-      "type": "string"
-    }
-  },
-  "required": [
-    "print",
-    "verify_with",
-    "source"
-  ],
-  "type": "object"
-}New value: +null
  3. First observed

TDQS

A4.5/5.0
Behavior5/5

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

Beyond the annotations (readOnlyHint, idempotentHint, non-destructive), the description adds substantial behavioral detail: the result is verifiable offline via pulse_verify_print, each print carries signature/kid/grade/venue count/dispersion/confidence interval, and consensus/blended grades are settleable while indicative is not. This meaningfully enriches what an agent knows about the tool's behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is dense but every sentence earns its place: purpose, verification path, result contents, grade rules, use-case, authentication, and a concrete example. The most important distinguishing trait, cryptographic signing and defensibility, is front-loaded.

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?

The description is complete for a read-only price tool: it explains the result's signature, the fields carried, which grades are settleable, the API key requirement, and the downstream verification tool. With an output schema present and annotations covering safety, nothing an agent needs 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.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% for both symbol and _apiKey, so the schema already documents parameter meaning. The description's example and signature/grade context add value around the result rather than around the parameters themselves. This matches the baseline for fully schema-covered parameters.

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 opens with a specific verb and resource: it returns the current cryptographically signed index price for one crypto asset from the Pulse Verity Index. It clearly distinguishes itself from sibling tools like pulse_signed_batch and pulse_verify_print by emphasizing the signed, single-asset nature of the result.

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?

The description explicitly says when to use the tool: 'Use it when a price has to be defensible — settlement, an audit trail, a dispute — not merely current.' It also clarifies grade settleability and verification workflow. However, it does not explicitly point to the obvious sibling alternative (e.g., pulse_signed_batch for multi-asset signing), so the when-not guidance is slightly incomplete.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

All Pulse Verity toolsInspect
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