paper-fetch-mcp

Overview Schema Source Related Servers Score Discussions Admin

batch_check

Read-only

Probe paper availability using metadata and landing-page signals, with optional concurrent checks, to verify access before fetching full text.

Instructions

Probe one or more papers using cheap metadata and landing-page signals, with optional cross-host concurrency. mode defaults to metadata and accepts only metadata; article mode and the standalone has_fulltext tool are removed. Read probe_state, evidence, and errors from input-ordered results (results[0] for one query). Never fetches full bodies or writes downloads. Use batch_fetch for real fetching and judge results by acceptance.

Input Schema

TableJSON Schema

Name	Required	Default
`mode`	No	metadata
`queries`	Yes
`concurrency`	No

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Changed2 schema fields changedv6.2.1Sep 8, 2026
- addedInput schema / properties / mode / const
```
Added value: +"metadata"
```
- removedInput schema / properties / mode / enum
```
Removed value: -[
-  "article",
-  "metadata"
-]
```

Changed1 schema field changedv6.1.0Sep 2, 2026

removedInput schema / properties / browser_auto_prepare

Removed value: -{
-  "anyOf": [
-    {
-      "type": "boolean"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "title": "Browser Auto Prepare"
-}

Changed1 schema field changedv6.0.1Aug 29, 2026

changedOutput schema / (root)

Previous value: -{
-  "$defs": {
-    "AcquisitionProvenanceOutput": {
-      "properties": {
-        "fallback_used": {
-          "type": "boolean"
-        },
-        "provider": {
-          "type": "string"
-        },
-        "representation": {
-          "type": "string"
-        },
-        "route": {
-          "type": "string"
-        },
-        "transport": {
-          "type": "string"
-        }
-      },
-      "type": "object"
-    },
-    "BatchCheckItemOutput": {
-      "properties": {
-        "acquisition": {
-          "anyOf": [
-            {
-              "$ref": "#/$defs/AcquisitionProvenanceOutput"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "candidates": {
-          "anyOf": [
-            {
-              "items": {
-                "$ref": "#/$defs/ResolvedCandidateOutput"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "code": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "content_kind": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "details": {
-          "additionalProperties": true,
-          "type": "object"
-        },
-        "doi": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "error": {
-          "anyOf": [
-            {
-              "additionalProperties": true,
-              "type": "object"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "error_category": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "evidence": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "has_abstract": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "has_fulltext": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "http_status": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "index": {
-          "type": "integer"
-        },
-        "missing_env": {
-          "anyOf": [
-            {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "probe_state": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "provider": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "provider_lane": {
-          "type": "string"
-        },
-        "query": {
-          "type": "string"
-        },
-        "reason": {
-          "type": "string"
-        },
-        "retry_after_seconds": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "retryable": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "route": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "schema_version": {
-          "type": "integer"
-        },
-        "source": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "source_trail": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "stage": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "status": {
-          "type": "string"
-        },
-        "title": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "token_estimate": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "token_estimate_breakdown": {
-          "anyOf": [
-            {
-              "$ref": "#/$defs/TokenEstimateBreakdownOutput"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "trace": {
-          "items": {
-            "$ref": "#/$defs/TraceEventOutput"
-          },
-          "type": "array"
-        },
-        "warnings": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        }
-      },
-      "type": "object"
-    },
-    "BatchTerminalProgressOutput": {
-      "properties": {
-        "completed": {
-          "type": "integer"
-        },
-        "not_scheduled": {
-          "type": "integer"
-        },
-        "terminal": {
-          "type": "integer"
-        },
-        "total": {
-          "type": "integer"
-        }
-      },
-      "required": [
-        "total",
-        "terminal",
-        "completed",
-        "not_scheduled"
-      ],
-      "type": "object"
-    },
-    "ErrorPayloadOutput": {
-      "properties": {
-        "candidates": {
-          "anyOf": [
-            {
-              "items": {
-                "$ref": "#/$defs/ResolvedCandidateOutput"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "code": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "details": {
-          "additionalProperties": true,
-          "type": "object"
-        },
-        "error_category": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "http_status": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "missing_env": {
-          "anyOf": [
-            {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "provider": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "reason": {
-          "type": "string"
-        },
-        "retry_after_seconds": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "retryable": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "route": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "schema_version": {
-          "type": "integer"
-        },
-        "source_trail": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "stage": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "status": {
-          "type": "string"
-        },
-        "trace": {
-          "items": {
-            "$ref": "#/$defs/TraceEventOutput"
-          },
-          "type": "array"
-        },
-        "warnings": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        }
-      },
-      "type": "object"
-    },
-    "ResolvedCandidateOutput": {
-      "properties": {
-        "author_score": {
-          "type": "number"
-        },
-        "authors": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "doi": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "journal_title": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "landing_page_url": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "provider_hint": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "published": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "score": {
-          "type": "number"
-        },
-        "title": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "title_score": {
-          "type": "number"
-        },
-        "year_score": {
-          "type": "number"
-        }
-      },
-      "type": "object"
-    },
-    "TokenEstimateBreakdownOutput": {
-      "properties": {
-        "abstract": {
-          "type": "integer"
-        },
-        "body": {
-          "type": "integer"
-        },
-        "refs": {
-          "type": "integer"
-        }
-      },
-      "type": "object"
-    },
-    "TraceEventOutput": {
-      "properties": {
-        "attempt": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "attempt_id": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "code": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "component": {
-          "type": "string"
-        },
-        "duration_ms": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "error_category": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "finished_at": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "http_status": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "message": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "outcome": {
-          "type": "string"
-        },
-        "parent_span_id": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "provider": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "retry_after_seconds": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "retryable": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "route": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "span_id": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "stage": {
-          "type": "string"
-        },
-        "started_at": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "target": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "target_sha256": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        }
-      },
-      "type": "object"
-    }
-  },
-  "properties": {
-    "abort_reason": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/ErrorPayloadOutput"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "aborted": {
-      "type": "boolean"
-    },
-    "candidates": {
-      "anyOf": [
-        {
-          "items": {
-            "$ref": "#/$defs/ResolvedCandidateOutput"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "details": {
-      "additionalProperties": true,
-      "type": "object"
-    },
-    "error_category": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "http_status": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "missing_env": {
-      "anyOf": [
-        {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "mode": {
-      "type": "string"
-    },
-    "progress": {
-      "$ref": "#/$defs/BatchTerminalProgressOutput"
-    },
-    "provider": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "reason": {
-      "type": "string"
-    },
-    "results": {
-      "items": {
-        "$ref": "#/$defs/BatchCheckItemOutput"
-      },
-      "type": "array"
-    },
-    "retry_after_seconds": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "retryable": {
-      "anyOf": [
-        {
-          "type": "boolean"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "route": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "schema_version": {
-      "type": "integer"
-    },
-    "source_trail": {
-      "items": {
-        "type": "string"
-      },
-      "type": "array"
-    },
-    "stage": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "status": {
-      "type": "string"
-    },
-    "trace": {
-      "items": {
-        "$ref": "#/$defs/TraceEventOutput"
-      },
-      "type": "array"
-    },
-    "warnings": {
-      "items": {
-        "type": "string"
-      },
-      "type": "array"
-    }
-  },
-  "type": "object"
-}New value: +null

Changed7 schema fields changedv5.5.0Aug 26, 2026

addedOutput schema / $defs / AcquisitionProvenanceOutput

Added value: +{
+  "properties": {
+    "fallback_used": {
+      "type": "boolean"
+    },
+    "provider": {
+      "type": "string"
+    },
+    "representation": {
+      "type": "string"
+    },
+    "route": {
+      "type": "string"
+    },
+    "transport": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

addedOutput schema / $defs / BatchCheckItemOutput / properties / acquisition

Added value: +{
+  "anyOf": [
+    {
+      "$ref": "#/$defs/AcquisitionProvenanceOutput"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / $defs / BatchCheckItemOutput / properties / error

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": true,
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / $defs / BatchCheckItemOutput / properties / index
```
Added value: +{
+  "type": "integer"
+}
```
addedOutput schema / $defs / BatchCheckItemOutput / properties / provider_lane
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / $defs / BatchTerminalProgressOutput

Added value: +{
+  "properties": {
+    "completed": {
+      "type": "integer"
+    },
+    "not_scheduled": {
+      "type": "integer"
+    },
+    "terminal": {
+      "type": "integer"
+    },
+    "total": {
+      "type": "integer"
+    }
+  },
+  "required": [
+    "total",
+    "terminal",
+    "completed",
+    "not_scheduled"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / progress

Added value: +{
+  "$ref": "#/$defs/BatchTerminalProgressOutput"
+}

Changed1 schema field changedv5.4.1Aug 20, 2026

addedInput schema / properties / browser_auto_prepare

Added value: +{
+  "anyOf": [
+    {
+      "type": "boolean"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Browser Auto Prepare"
+}

Changed120 schema fields changedv4.1.0Jul 30, 2026
- removedOutput schema / $defs / BatchCheckItemOutput / properties / candidates / title
```
Removed value: -"Candidates"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / code / title
```
Removed value: -"Code"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / content_kind / title
```
Removed value: -"Content Kind"
```
- addedOutput schema / $defs / BatchCheckItemOutput / properties / details
```
Added value: +{
+  "additionalProperties": true,
+  "type": "object"
+}
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / doi / title
```
Removed value: -"Doi"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / error_category / title
```
Removed value: -"Error Category"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / evidence / title
```
Removed value: -"Evidence"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / has_abstract / title
```
Removed value: -"Has Abstract"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / has_fulltext / title
```
Removed value: -"Has Fulltext"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / http_status / title
```
Removed value: -"Http Status"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / missing_env / title
```
Removed value: -"Missing Env"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / probe_state / title
```
Removed value: -"Probe State"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / provider / title
```
Removed value: -"Provider"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / query / title
```
Removed value: -"Query"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / reason / title
```
Removed value: -"Reason"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / retry_after_seconds / title
```
Removed value: -"Retry After Seconds"
```
- addedOutput schema / $defs / BatchCheckItemOutput / properties / retryable
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "boolean"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / BatchCheckItemOutput / properties / route
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / schema_version / title
```
Removed value: -"Schema Version"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / source / title
```
Removed value: -"Source"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / source_trail / title
```
Removed value: -"Source Trail"
```
- addedOutput schema / $defs / BatchCheckItemOutput / properties / stage
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / status / title
```
Removed value: -"Status"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / title / title
```
Removed value: -"Title"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / token_estimate / title
```
Removed value: -"Token Estimate"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / trace / title
```
Removed value: -"Trace"
```
- removedOutput schema / $defs / BatchCheckItemOutput / properties / warnings / title
```
Removed value: -"Warnings"
```
- removedOutput schema / $defs / BatchCheckItemOutput / title
```
Removed value: -"BatchCheckItemOutput"
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / candidates / title
```
Removed value: -"Candidates"
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / code / title
```
Removed value: -"Code"
```
- addedOutput schema / $defs / ErrorPayloadOutput / properties / details
```
Added value: +{
+  "additionalProperties": true,
+  "type": "object"
+}
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / error_category / title
```
Removed value: -"Error Category"
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / http_status / title
```
Removed value: -"Http Status"
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / missing_env / title
```
Removed value: -"Missing Env"
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / provider / title
```
Removed value: -"Provider"
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / reason / title
```
Removed value: -"Reason"
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / retry_after_seconds / title
```
Removed value: -"Retry After Seconds"
```
- addedOutput schema / $defs / ErrorPayloadOutput / properties / retryable
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "boolean"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / ErrorPayloadOutput / properties / route
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / schema_version / title
```
Removed value: -"Schema Version"
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / source_trail / title
```
Removed value: -"Source Trail"
```
- addedOutput schema / $defs / ErrorPayloadOutput / properties / stage
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / status / title
```
Removed value: -"Status"
```
- addedOutput schema / $defs / ErrorPayloadOutput / properties / trace
```
Added value: +{
+  "items": {
+    "$ref": "#/$defs/TraceEventOutput"
+  },
+  "type": "array"
+}
```
- removedOutput schema / $defs / ErrorPayloadOutput / properties / warnings / title
```
Removed value: -"Warnings"
```
- removedOutput schema / $defs / ErrorPayloadOutput / title
```
Removed value: -"ErrorPayloadOutput"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / author_score / title
```
Removed value: -"Author Score"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / authors / title
```
Removed value: -"Authors"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / doi / title
```
Removed value: -"Doi"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / journal_title / title
```
Removed value: -"Journal Title"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / landing_page_url / title
```
Removed value: -"Landing Page Url"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / provider_hint / title
```
Removed value: -"Provider Hint"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / published / title
```
Removed value: -"Published"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / score / title
```
Removed value: -"Score"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / title / title
```
Removed value: -"Title"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / title_score / title
```
Removed value: -"Title Score"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / properties / year_score / title
```
Removed value: -"Year Score"
```
- removedOutput schema / $defs / ResolvedCandidateOutput / title
```
Removed value: -"ResolvedCandidateOutput"
```
- removedOutput schema / $defs / TokenEstimateBreakdownOutput / properties / abstract / title
```
Removed value: -"Abstract"
```
- removedOutput schema / $defs / TokenEstimateBreakdownOutput / properties / body / title
```
Removed value: -"Body"
```
- removedOutput schema / $defs / TokenEstimateBreakdownOutput / properties / refs / title
```
Removed value: -"Refs"
```
- removedOutput schema / $defs / TokenEstimateBreakdownOutput / title
```
Removed value: -"TokenEstimateBreakdownOutput"
```
- addedOutput schema / $defs / TraceEventOutput / properties / attempt
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / attempt_id
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / $defs / TraceEventOutput / properties / code / title
```
Removed value: -"Code"
```
- removedOutput schema / $defs / TraceEventOutput / properties / component / title
```
Removed value: -"Component"
```
- addedOutput schema / $defs / TraceEventOutput / properties / duration_ms
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / error_category
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / finished_at
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / http_status
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / $defs / TraceEventOutput / properties / message / title
```
Removed value: -"Message"
```
- removedOutput schema / $defs / TraceEventOutput / properties / outcome / title
```
Removed value: -"Outcome"
```
- addedOutput schema / $defs / TraceEventOutput / properties / parent_span_id
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / provider
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / retry_after_seconds
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / retryable
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "boolean"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / route
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / span_id
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / $defs / TraceEventOutput / properties / stage / title
```
Removed value: -"Stage"
```
- addedOutput schema / $defs / TraceEventOutput / properties / started_at
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / target
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / $defs / TraceEventOutput / properties / target_sha256
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / $defs / TraceEventOutput / title
```
Removed value: -"TraceEventOutput"
```
- removedOutput schema / properties / abort_reason / default
```
Removed value: -null
```
- removedOutput schema / properties / aborted / default
```
Removed value: -null
```
- removedOutput schema / properties / aborted / title
```
Removed value: -"Aborted"
```
- removedOutput schema / properties / candidates / default
```
Removed value: -null
```
- removedOutput schema / properties / candidates / title
```
Removed value: -"Candidates"
```
- removedOutput schema / properties / code / default
```
Removed value: -null
```
- removedOutput schema / properties / code / title
```
Removed value: -"Code"
```
- addedOutput schema / properties / details
```
Added value: +{
+  "additionalProperties": true,
+  "type": "object"
+}
```
- removedOutput schema / properties / error_category / default
```
Removed value: -null
```
- removedOutput schema / properties / error_category / title
```
Removed value: -"Error Category"
```
- removedOutput schema / properties / http_status / default
```
Removed value: -null
```
- removedOutput schema / properties / http_status / title
```
Removed value: -"Http Status"
```
- removedOutput schema / properties / missing_env / default
```
Removed value: -null
```
- removedOutput schema / properties / missing_env / title
```
Removed value: -"Missing Env"
```
- removedOutput schema / properties / mode / default
```
Removed value: -null
```
- removedOutput schema / properties / mode / title
```
Removed value: -"Mode"
```
- removedOutput schema / properties / provider / default
```
Removed value: -null
```
- removedOutput schema / properties / provider / title
```
Removed value: -"Provider"
```
- removedOutput schema / properties / reason / default
```
Removed value: -null
```
- removedOutput schema / properties / reason / title
```
Removed value: -"Reason"
```
- removedOutput schema / properties / results / default
```
Removed value: -null
```
- removedOutput schema / properties / results / title
```
Removed value: -"Results"
```
- removedOutput schema / properties / retry_after_seconds / default
```
Removed value: -null
```
- removedOutput schema / properties / retry_after_seconds / title
```
Removed value: -"Retry After Seconds"
```
- addedOutput schema / properties / retryable
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "boolean"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- addedOutput schema / properties / route
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / properties / schema_version / default
```
Removed value: -null
```
- removedOutput schema / properties / schema_version / title
```
Removed value: -"Schema Version"
```
- removedOutput schema / properties / source_trail / default
```
Removed value: -null
```
- removedOutput schema / properties / source_trail / title
```
Removed value: -"Source Trail"
```
- addedOutput schema / properties / stage
```
Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```
- removedOutput schema / properties / status / default
```
Removed value: -null
```
- removedOutput schema / properties / status / title
```
Removed value: -"Status"
```
- addedOutput schema / properties / trace
```
Added value: +{
+  "items": {
+    "$ref": "#/$defs/TraceEventOutput"
+  },
+  "type": "array"
+}
```
- removedOutput schema / properties / warnings / default
```
Removed value: -null
```
- removedOutput schema / properties / warnings / title
```
Removed value: -"Warnings"
```
- removedOutput schema / title
```
Removed value: -"BatchCheckOutput"
```
Addedv3.2.0Jul 25, 2026
Removedv3.1.3Jul 18, 2026
Changed7 schema fields changedv3.1.3Jul 18, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```
- addedInput schema / properties / concurrency / maximum
```
Added value: +8
```
- addedInput schema / properties / concurrency / minimum
```
Added value: +1
```
- addedInput schema / properties / mode / enum
```
Added value: +[
+  "article",
+  "metadata"
+]
```
- addedInput schema / properties / queries / maxItems
```
Added value: +50
```
- addedInput schema / properties / queries / minItems
```
Added value: +1
```
- changedInput schema / title
```
Previous value: -"batch_checkArguments"New value: +"BatchCheckRequest"
```
First observedv1.0.0Jul 11, 2026

TDQS

A4.9/5.0

Behavior5/5

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

Annotations already declare readOnlyHint and openWorldHint, and the description adds concrete behavioral context: it never fetches full bodies, never writes downloads, returns input-ordered results, and exposes probe_state, evidence, and errors. This goes well beyond the structured annotations and accurately characterizes the operation.

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. It front-loads the core purpose, then adds mode constraints, result semantics, safety guarantees, and the sibling alternative in a compact form without redundancy.

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?

For a read-only probe tool with no output schema, the description is remarkably complete: it explains what signals are used, how to read results, what not to expect, and how to select the sibling tool for real fetching. The agent has enough to invoke it correctly and interpret its output.

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 0%, so the description must carry semantic weight. It does clarify mode ('defaults to metadata and accepts only metadata'), queries ('input-ordered results', results[0] for one query), and concurrency ('optional cross-host concurrency'). Minor gaps remain: it doesn't explain concurrency's upper bound or default behavior, though the schema provides those constraints.

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 names a specific verb and resource: 'Probe one or more papers using cheap metadata and landing-page signals.' It also distinguishes itself from batch_fetch by explicitly stating that this tool never fetches full bodies or writes downloads, so an agent can tell them apart without opening schemas.

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?

The description gives clear guidance: use batch_check for probing and batch_fetch for real fetching. It also explicitly states that mode only accepts metadata and that article mode and has_fulltext are removed, preventing agents from attempting unsupported modes.

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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