OneQAZ Trading Intelligence

Explain a Decision

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

Name	Required	Description	Default
`symbol`	Yes	Symbol to explain (e.g., btc, eth, 005930)
`market_id`	Yes	Market identifier (crypto, kr_stock, us_stock; aliases coin/kr/us)

Output Schema

TableJSON Schema

Name	Required	Description
`full_data`	No
`timestamp`	Yes	RFC3339 UTC, server build time
`disclaimer`	Yes	Canonical compliance disclaimer (always present)
`request_id`	Yes	32-hex per-response correlation id
`is_real_money`	No
`data_classification`	No
`is_investment_advice`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 7, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```

Changed1 schema field changedOct 7, 2026

changedOutput schema / properties / full_data / anyOf

Previous value: -[
-  {
-    "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"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "description": "`full_data` for explain_decision.",
+    "properties": {
+      "layers": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "overall_recommendation": {
+        "additionalProperties": true,
+        "properties": {
+          "basis": {
+            "anyOf": [
+              {
+                "additionalProperties": true,
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null
+          },
+          "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"
+  }
+]

Changed17 schema fields changedSep 23, 2026

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)"
-}

Changed3 schema fields changedSep 22, 2026

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)"

Changed1 schema field changedJul 20, 2026

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"
+  }
+]

Changed1 schema field changedJul 7, 2026

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"
+  }
+]

Changed2 schema fields changedJun 8, 2026

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"
+]

First observedApr 19, 2026

TDQS

A4.6/5.0

Behavior4/5

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

Annotations already cover the read-only/idempotent/open-world profile, but the description adds meaningful context beyond them: the layered composition of the output and the caveat that results are research evidence, NOT a buy/sell recommendation. It also notes the symbol must match the per-symbol store filename (lowercase). Strong, though return-format detail is left to the output schema.

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?

Front-loaded with Purpose and cleanly sectioned (Triggers, When to call, Prerequisites, Next steps, Caveats), so an agent can skim it. Slightly redundant: the Triggers list and the 'When to call' line restate the same condition, and 'Next steps: none' is low-value filler.

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?

An output schema exists, so return values needn't be explained. Prerequisites, trigger phrasing, the symbol-format caveat, and the non-recommendation disclaimer together cover everything an agent needs to invoke this correctly.

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 description coverage is 100%, so both parameters (symbol, market_id enum) are already documented, establishing a baseline of 3. The description adds non-obvious meaning on top: symbol must match the per-symbol signal store filename and be lowercase, which the schema does not state.

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?

States a specific verb+resource (multi-layer explanation for a single symbol's recent research signal) and enumerates exactly what it combines: score_trace, Thompson + regime scores, and news causality context. An agent can distinguish it from siblings like get_signal_detail and get_latest_decisions without opening either 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?

Gives explicit when-to-call conditions, multilingual trigger phrases, prerequisites (identify the symbol via get_signals or get_latest_decisions first), and a next-steps declaration. The alternative routing is spelled out rather than inferred.

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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