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OneQAZ Trading Intelligence

by io.github.wnsod
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explain_decision

Read-onlyIdempotent

Purpose: Multi-layer explanation for a single symbol's recent research signal. Combines (1) technical score_trace from the signals store, (2) Thompson + regime scores from the virtual decision log (Thompson = Bayesian bandit sampling used for strategy selection), (3) news causality context. Use this when an AI must present a structured "why" rather than a raw verdict. Triggers (casual questions too): "why is BTC bullish?", "왜 이 종목이 매수야?", "explain that signal", "판단 근거 설명해줘", "walk me through the reasoning". When to call: when the user asks "why is this signal bullish/bearish?". Prerequisites: identify the symbol via get_signals or get_latest_decisions first. Next steps: none (this completes the explanation chain). Caveats: symbol must match the per-symbol signal store filename (lowercase). Output is research evidence, NOT a buy or sell recommendation.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
symbolYesSymbol to explain (e.g., btc, eth, 005930)
market_idYesMarket identifier (crypto, kr_stock, us_stock; aliases coin/kr/us)

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
full_dataNo
timestampYesRFC3339 UTC, server build time
disclaimerYesCanonical compliance disclaimer (always present)
request_idYes32-hex per-response correlation id
is_real_moneyNo
data_classificationNo
is_investment_adviceNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed17 schema fields changed
    • removedOutput schema / properties / _followup_questions_for_user
      Removed value: -{
-  "anyOf": [
-    {
-      "items": {
-        "type": "string"
-      },
-      "type": "array"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null
-}
    • removedOutput schema / properties / _llm_summary
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null
-}
    • removedOutput schema / properties / _market_state_narrative
      Removed value: -{
-  "anyOf": [
-    {
-      "additionalProperties": true,
-      "description": "Wrapper for `_market_state_narrative` — bilingual + provenance.",
-      "properties": {
-        "_source": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "en": {
-          "anyOf": [
-            {
-              "additionalProperties": true,
-              "description": "Bilingual narrative — one of {ko, en} must carry a headline.",
-              "properties": {
-                "evidence": {
-                  "items": {
-                    "type": "string"
-                  },
-                  "type": "array"
-                },
-                "headline": {
-                  "type": "string"
-                },
-                "what_to_watch": {
-                  "anyOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ],
-                  "default": null
-                }
-              },
-              "required": [
-                "headline"
-              ],
-              "type": "object"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "ko": {
-          "anyOf": [
-            {
-              "additionalProperties": true,
-              "description": "Bilingual narrative — one of {ko, en} must carry a headline.",
-              "properties": {
-                "evidence": {
-                  "items": {
-                    "type": "string"
-                  },
-                  "type": "array"
-                },
-                "headline": {
-                  "type": "string"
-                },
-                "what_to_watch": {
-                  "anyOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ],
-                  "default": null
-                }
-              },
-              "required": [
-                "headline"
-              ],
-              "type": "object"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null
-}
    • removedOutput schema / properties / _next_actions
      Removed value: -{
-  "anyOf": [
-    {
-      "items": {
-        "additionalProperties": true,
-        "description": "One AI-actionable follow-up call recommendation.",
-        "properties": {
-          "args": {
-            "additionalProperties": true,
-            "type": "object"
-          },
-          "intent": {
-            "description": "Short intent label, max ~120 chars",
-            "type": "string"
-          },
-          "priority": {
-            "default": "normal",
-            "enum": [
-              "high",
-              "normal",
-              "low"
-            ],
-            "type": "string"
-          },
-          "rationale": {
-            "default": "",
-            "description": "Why this is recommended",
-            "type": "string"
-          },
-          "tool": {
-            "description": "Recommended tool name to invoke next",
-            "type": "string"
-          }
-        },
-        "required": [
-          "intent",
-          "tool"
-        ],
-        "type": "object"
-      },
-      "type": "array"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null
-}
    • removedOutput schema / properties / _value_signals
      Removed value: -{
-  "anyOf": [
-    {
-      "additionalProperties": true,
-      "description": "Static product/value metadata — same for every response of a tool type.",
-      "properties": {
-        "data_freshness_seconds": {
-          "default": 120,
-          "type": "integer"
-        },
-        "key_signup_url": {
-          "default": "https://api.oneqaz.com/keys",
-          "type": "string"
-        },
-        "pricing_url": {
-          "default": "https://api.oneqaz.com/pricing",
-          "type": "string"
-        },
-        "schema_version": {
-          "default": "1.1",
-          "type": "string"
-        },
-        "self_correcting": {
-          "default": true,
-          "type": "boolean"
-        },
-        "tier_default": {
-          "default": "free",
-          "enum": [
-            "free",
-            "pro",
-            "internal"
-          ],
-          "type": "string"
-        },
-        "tier_default_limits": {
-          "additionalProperties": {
-            "type": "integer"
-          },
-          "type": "object"
-        },
-        "what_pro_unlocks": {
-          "default": "33x daily quota (50K), 3.3x burst (200/min) — same tools, higher volume",
-          "type": "string"
-        }
-      },
-      "type": "object"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null
-}
    • removedOutput schema / properties / action
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "Recommended client action (error path)"
-}
    • removedOutput schema / properties / action_value
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null
-}
    • removedOutput schema / properties / ai_summary
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "One-line AI-oriented summary (success path)"
-}
    • removedOutput schema / properties / ai_summary_generated_at
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "RFC3339 UTC"
-}
    • removedOutput schema / properties / ai_summary_ttl_seconds
      Removed value: -{
-  "anyOf": [
-    {
-      "minimum": 0,
-      "type": "integer"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null
-}
    • removedOutput schema / properties / error
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "boolean"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "Set true on error responses"
-}
    • removedOutput schema / properties / error_code
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "Stable error identifier; see mcp_error_policy.md"
-}
    • removedOutput schema / properties / fallback_note
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null
-}
    • removedOutput schema / properties / fallback_tool
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "Suggested fallback (error path)"
-}
    • removedOutput schema / properties / reason
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "Human-readable cause (error path)"
-}
    • removedOutput schema / properties / retryable
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "boolean"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "Whether the client should retry (error path)"
-}
    • removedOutput schema / properties / summary_for_user
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "One-line jargon-free Korean summary (success path)"
-}
  2. Changed3 schema fields changed
    • addedInput schema / properties / market_id / description
      Added value: +"Market identifier (crypto, kr_stock, us_stock; aliases coin/kr/us)"
    • addedInput schema / properties / market_id / enum
      Added value: +[
+  "crypto",
+  "kr_stock",
+  "us_stock"
+]
    • addedInput schema / properties / symbol / description
      Added value: +"Symbol to explain (e.g., btc, eth, 005930)"
  3. Changed1 schema field changed
    • changedOutput schema / properties / _value_signals / anyOf
      Previous value: -[
-  {
-    "additionalProperties": true,
-    "description": "Static product/value metadata — same for every response of a tool type.",
-    "properties": {
-      "data_freshness_seconds": {
-        "default": 120,
-        "type": "integer"
-      },
-      "key_signup_url": {
-        "default": "https://api.oneqaz.com/keys",
-        "type": "string"
-      },
-      "pricing_url": {
-        "default": "https://api.oneqaz.com/pricing",
-        "type": "string"
-      },
-      "schema_version": {
-        "default": "1.0",
-        "type": "string"
-      },
-      "self_correcting": {
-        "default": true,
-        "type": "boolean"
-      },
-      "tier_default": {
-        "default": "free",
-        "enum": [
-          "free",
-          "pro",
-          "internal"
-        ],
-        "type": "string"
-      },
-      "tier_default_limits": {
-        "additionalProperties": {
-          "type": "integer"
-        },
-        "type": "object"
-      },
-      "what_pro_unlocks": {
-        "default": "33x daily quota (50K), 3.3x burst (200/min) — same tools, higher volume",
-        "type": "string"
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "description": "Static product/value metadata — same for every response of a tool type.",
+    "properties": {
+      "data_freshness_seconds": {
+        "default": 120,
+        "type": "integer"
+      },
+      "key_signup_url": {
+        "default": "https://api.oneqaz.com/keys",
+        "type": "string"
+      },
+      "pricing_url": {
+        "default": "https://api.oneqaz.com/pricing",
+        "type": "string"
+      },
+      "schema_version": {
+        "default": "1.1",
+        "type": "string"
+      },
+      "self_correcting": {
+        "default": true,
+        "type": "boolean"
+      },
+      "tier_default": {
+        "default": "free",
+        "enum": [
+          "free",
+          "pro",
+          "internal"
+        ],
+        "type": "string"
+      },
+      "tier_default_limits": {
+        "additionalProperties": {
+          "type": "integer"
+        },
+        "type": "object"
+      },
+      "what_pro_unlocks": {
+        "default": "33x daily quota (50K), 3.3x burst (200/min) — same tools, higher volume",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]
  4. Changed1 schema field changed
    • changedOutput schema / properties / _value_signals / anyOf
      Previous value: -[
-  {
-    "additionalProperties": true,
-    "description": "Static product/value metadata — same for every response of a tool type.",
-    "properties": {
-      "data_freshness_seconds": {
-        "default": 120,
-        "type": "integer"
-      },
-      "key_signup_url": {
-        "default": "https://oneqaz.com/keys",
-        "type": "string"
-      },
-      "pricing_url": {
-        "default": "https://oneqaz.com/pricing",
-        "type": "string"
-      },
-      "schema_version": {
-        "default": "1.0",
-        "type": "string"
-      },
-      "self_correcting": {
-        "default": true,
-        "type": "boolean"
-      },
-      "tier_default": {
-        "default": "free",
-        "enum": [
-          "free",
-          "pro",
-          "internal"
-        ],
-        "type": "string"
-      },
-      "tier_default_limits": {
-        "additionalProperties": {
-          "type": "integer"
-        },
-        "type": "object"
-      },
-      "what_pro_unlocks": {
-        "default": "33x daily quota (50K), 3.3x burst (200/min) — same tools, higher volume",
-        "type": "string"
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "description": "Static product/value metadata — same for every response of a tool type.",
+    "properties": {
+      "data_freshness_seconds": {
+        "default": 120,
+        "type": "integer"
+      },
+      "key_signup_url": {
+        "default": "https://api.oneqaz.com/keys",
+        "type": "string"
+      },
+      "pricing_url": {
+        "default": "https://api.oneqaz.com/pricing",
+        "type": "string"
+      },
+      "schema_version": {
+        "default": "1.0",
+        "type": "string"
+      },
+      "self_correcting": {
+        "default": true,
+        "type": "boolean"
+      },
+      "tier_default": {
+        "default": "free",
+        "enum": [
+          "free",
+          "pro",
+          "internal"
+        ],
+        "type": "string"
+      },
+      "tier_default_limits": {
+        "additionalProperties": {
+          "type": "integer"
+        },
+        "type": "object"
+      },
+      "what_pro_unlocks": {
+        "default": "33x daily quota (50K), 3.3x burst (200/min) — same tools, higher volume",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]
  5. Changed2 schema fields changed
    • addedOutput schema / properties
      Added value: +{
+  "_followup_questions_for_user": {
+    "anyOf": [
+      {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "_llm_summary": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "_market_state_narrative": {
+    "anyOf": [
+      {
+        "additionalProperties": true,
+        "description": "Wrapper for `_market_state_narrative` — bilingual + provenance.",
+        "properties": {
+          "_source": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null
+          },
+          "en": {
+            "anyOf": [
+              {
+                "additionalProperties": true,
+                "description": "Bilingual narrative — one of {ko, en} must carry a headline.",
+                "properties": {
+                  "evidence": {
+                    "items": {
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  "headline": {
+                    "type": "string"
+                  },
+                  "what_to_watch": {
+                    "anyOf": [
+                      {
+                        "type": "string"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ],
+                    "default": null
+                  }
+                },
+                "required": [
+                  "headline"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null
+          },
+          "ko": {
+            "anyOf": [
+              {
+                "additionalProperties": true,
+                "description": "Bilingual narrative — one of {ko, en} must carry a headline.",
+                "properties": {
+                  "evidence": {
+                    "items": {
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  "headline": {
+                    "type": "string"
+                  },
+                  "what_to_watch": {
+                    "anyOf": [
+                      {
+                        "type": "string"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ],
+                    "default": null
+                  }
+                },
+                "required": [
+                  "headline"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null
+          }
+        },
+        "type": "object"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "_next_actions": {
+    "anyOf": [
+      {
+        "items": {
+          "additionalProperties": true,
+          "description": "One AI-actionable follow-up call recommendation.",
+          "properties": {
+            "args": {
+              "additionalProperties": true,
+              "type": "object"
+            },
+            "intent": {
+              "description": "Short intent label, max ~120 chars",
+              "type": "string"
+            },
+            "priority": {
+              "default": "normal",
+              "enum": [
+                "high",
+                "normal",
+                "low"
+              ],
+              "type": "string"
+            },
+            "rationale": {
+              "default": "",
+              "description": "Why this is recommended",
+              "type": "string"
+            },
+            "tool": {
+              "description": "Recommended tool name to invoke next",
+              "type": "string"
+            }
+          },
+          "required": [
+            "intent",
+            "tool"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "_value_signals": {
+    "anyOf": [
+      {
+        "additionalProperties": true,
+        "description": "Static product/value metadata — same for every response of a tool type.",
+        "properties": {
+          "data_freshness_seconds": {
+            "default": 120,
+            "type": "integer"
+          },
+          "key_signup_url": {
+            "default": "https://oneqaz.com/keys",
+            "type": "string"
+          },
+          "pricing_url": {
+            "default": "https://oneqaz.com/pricing",
+            "type": "string"
+          },
+          "schema_version": {
+            "default": "1.0",
+            "type": "string"
+          },
+          "self_correcting": {
+            "default": true,
+            "type": "boolean"
+          },
+          "tier_default": {
+            "default": "free",
+            "enum": [
+              "free",
+              "pro",
+              "internal"
+            ],
+            "type": "string"
+          },
+          "tier_default_limits": {
+            "additionalProperties": {
+              "type": "integer"
+            },
+            "type": "object"
+          },
+          "what_pro_unlocks": {
+            "default": "33x daily quota (50K), 3.3x burst (200/min) — same tools, higher volume",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "action": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "Recommended client action (error path)"
+  },
+  "action_value": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "ai_summary": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "One-line AI-oriented summary (success path)"
+  },
+  "ai_summary_generated_at": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "RFC3339 UTC"
+  },
+  "ai_summary_ttl_seconds": {
+    "anyOf": [
+      {
+        "minimum": 0,
+        "type": "integer"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "data_classification": {
+    "anyOf": [
+      {
+        "const": "research_information_only",
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "disclaimer": {
+    "description": "Canonical compliance disclaimer (always present)",
+    "type": "string"
+  },
+  "error": {
+    "anyOf": [
+      {
+        "type": "boolean"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "Set true on error responses"
+  },
+  "error_code": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "Stable error identifier; see mcp_error_policy.md"
+  },
+  "fallback_note": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "fallback_tool": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "Suggested fallback (error path)"
+  },
+  "full_data": {
+    "anyOf": [
+      {
+        "additionalProperties": true,
+        "description": "`full_data` for explain_decision.",
+        "properties": {
+          "layers": {
+            "additionalProperties": true,
+            "type": "object"
+          },
+          "overall_recommendation": {
+            "additionalProperties": true,
+            "properties": {
+              "text": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "default": null
+              },
+              "verdict": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "default": null
+              }
+            },
+            "type": "object"
+          },
+          "symbol": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "symbol"
+        ],
+        "type": "object"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "is_investment_advice": {
+    "anyOf": [
+      {
+        "const": false,
+        "type": "boolean"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "is_real_money": {
+    "anyOf": [
+      {
+        "const": false,
+        "type": "boolean"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null
+  },
+  "reason": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "Human-readable cause (error path)"
+  },
+  "request_id": {
+    "description": "32-hex per-response correlation id",
+    "type": "string"
+  },
+  "retryable": {
+    "anyOf": [
+      {
+        "type": "boolean"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "Whether the client should retry (error path)"
+  },
+  "summary_for_user": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "One-line jargon-free Korean summary (success path)"
+  },
+  "timestamp": {
+    "description": "RFC3339 UTC, server build time",
+    "type": "string"
+  }
+}
    • addedOutput schema / required
      Added value: +[
+  "disclaimer",
+  "request_id",
+  "timestamp"
+]
  6. First observed

TDQS

A4.8/5.0
Behavior5/5

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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, so the description correctly does not repeat these. It adds important behavioral context: the output is 'research evidence, NOT a buy or sell recommendation' – a critical caveat for an agent to know. It also discloses the caveat that symbol must match the per-symbol signal store filename (lowercase). No contradiction with 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 well-structured with labeled sections (Purpose, Triggers, When to call, Prerequisites, Next steps, Caveats). It is front-loaded with the purpose and includes only relevant information. While it is longer than necessary, every section contributes useful operational detail, so it earns its length.

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 tool's complexity (multi-layer explanation combining three sources) and the presence of an output schema (which likely documents the return structure), the description covers all essential aspects: purpose, usage triggers, prerequisites, caveats, and non-recommendation status. An agent has enough information to call it correctly without further research.

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 both parameters are documented in the schema. The description adds extra value by specifying that the 'symbol' parameter must be lowercase and match the per-symbol signal store filename, which is not in the schema. It also reiterates market_id aliases (coin/kr/us) indirectly through the schema description, but the lowercase requirement is a genuine addition.

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 clearly states the tool's purpose: 'Multi-layer explanation for a single symbol's recent research signal' combining technical score_trace, Thompson/regime scores, and news causality. It distinguishes itself from raw verdict tools by saying 'Use this when an AI must present a structured "why" rather than a raw verdict.' It also provides concrete trigger examples, making it unmistakable when to use this tool versus siblings like get_signals or get_latest_decisions.

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?

Explicitly states when to call: 'when the user asks "why is this signal bullish/bearish?"' and lists casual trigger phrases in multiple languages. It also gives prerequisites ('identify the symbol via get_signals or get_latest_decisions first'), and notes that this tool completes the explanation chain (next steps: none). This provides a clear decision boundary and alternative tools to use beforehand.

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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