paper-fetch-mcp

Overview Schema Source Related Servers Score Discussions Admin

list_cached

Read-only

List DOI-proven cached papers from the cache index without network calls or loose-file scans. Use it to see which downloaded papers are available.

Instructions

List DOI-proven cached downloads from the current cache index without touching the network or scanning loose files.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`download_dir`	No

Schema Changelog

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

Changed1 schema field changedv6.1.0Sep 2, 2026

removedInput schema / properties / cache_mode

Removed value: -{
-  "default": "index",
-  "enum": [
-    "index",
-    "refresh",
-    "rescan"
-  ],
-  "title": "Cache Mode",
-  "type": "string"
-}

Changed1 schema field changedv6.0.1Aug 29, 2026

changedOutput schema / (root)

Previous value: -{
-  "$defs": {
-    "AcquisitionProvenanceOutput": {
-      "properties": {
-        "fallback_used": {
-          "type": "boolean"
-        },
-        "provider": {
-          "type": "string"
-        },
-        "representation": {
-          "type": "string"
-        },
-        "route": {
-          "type": "string"
-        },
-        "transport": {
-          "type": "string"
-        }
-      },
-      "type": "object"
-    },
-    "CacheEntryOutput": {
-      "properties": {
-        "acquisition": {
-          "anyOf": [
-            {
-              "$ref": "#/$defs/AcquisitionProvenanceOutput"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "completed_at": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "content_kind": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "content_sha256": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "doi": {
-          "type": "string"
-        },
-        "has_fulltext": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "id": {
-          "type": "string"
-        },
-        "identity_proof": {
-          "type": "string"
-        },
-        "kind": {
-          "type": "string"
-        },
-        "likely_has_fulltext": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "mime": {
-          "type": "string"
-        },
-        "mtime": {
-          "type": "number"
-        },
-        "path": {
-          "type": "string"
-        },
-        "size": {
-          "type": "integer"
-        },
-        "source": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        }
-      },
-      "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"
-    },
-    "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": {
-    "cache_mode": {
-      "type": "string"
-    },
-    "candidates": {
-      "anyOf": [
-        {
-          "items": {
-            "$ref": "#/$defs/ResolvedCandidateOutput"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "details": {
-      "additionalProperties": true,
-      "type": "object"
-    },
-    "download_dir": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "entries": {
-      "items": {
-        "$ref": "#/$defs/CacheEntryOutput"
-      },
-      "type": "array"
-    },
-    "error_category": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "expected_index_version": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "http_status": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "index_reason": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "index_status": {
-      "type": "string"
-    },
-    "index_version": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "string"
-        },
-        {
-          "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"
-}New value: +null

Changed2 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 / CacheEntryOutput / properties / acquisition

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

Changed72 schema fields changedv4.1.0Jul 30, 2026

removedOutput schema / $defs / CacheEntryOutput / properties / completed_at / title
```
Removed value: -"Completed At"
```
removedOutput schema / $defs / CacheEntryOutput / properties / content_kind / title
```
Removed value: -"Content Kind"
```
removedOutput schema / $defs / CacheEntryOutput / properties / content_sha256 / title
```
Removed value: -"Content Sha256"
```
removedOutput schema / $defs / CacheEntryOutput / properties / doi / title
```
Removed value: -"Doi"
```
removedOutput schema / $defs / CacheEntryOutput / properties / has_fulltext / title
```
Removed value: -"Has Fulltext"
```
removedOutput schema / $defs / CacheEntryOutput / properties / id / title
```
Removed value: -"Id"
```
removedOutput schema / $defs / CacheEntryOutput / properties / identity_proof / title
```
Removed value: -"Identity Proof"
```
removedOutput schema / $defs / CacheEntryOutput / properties / kind / title
```
Removed value: -"Kind"
```

addedOutput schema / $defs / CacheEntryOutput / properties / likely_has_fulltext

Added value: +{
+  "anyOf": [
+    {
+      "type": "boolean"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

removedOutput schema / $defs / CacheEntryOutput / properties / mime / title
```
Removed value: -"Mime"
```
removedOutput schema / $defs / CacheEntryOutput / properties / mtime / title
```
Removed value: -"Mtime"
```
removedOutput schema / $defs / CacheEntryOutput / properties / path / title
```
Removed value: -"Path"
```
removedOutput schema / $defs / CacheEntryOutput / properties / size / title
```
Removed value: -"Size"
```
removedOutput schema / $defs / CacheEntryOutput / properties / source / title
```
Removed value: -"Source"
```
removedOutput schema / $defs / CacheEntryOutput / title
```
Removed value: -"CacheEntryOutput"
```
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"
```

addedOutput schema / $defs / TraceEventOutput

Added value: +{
+  "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"
+}

removedOutput schema / properties / cache_mode / default
```
Removed value: -null
```
removedOutput schema / properties / cache_mode / title
```
Removed value: -"Cache Mode"
```
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 / download_dir / default
```
Removed value: -null
```
removedOutput schema / properties / download_dir / title
```
Removed value: -"Download Dir"
```
removedOutput schema / properties / entries / default
```
Removed value: -null
```
removedOutput schema / properties / entries / title
```
Removed value: -"Entries"
```
removedOutput schema / properties / error_category / default
```
Removed value: -null
```
removedOutput schema / properties / error_category / title
```
Removed value: -"Error Category"
```
removedOutput schema / properties / expected_index_version / default
```
Removed value: -null
```
removedOutput schema / properties / expected_index_version / title
```
Removed value: -"Expected Index Version"
```
removedOutput schema / properties / http_status / default
```
Removed value: -null
```
removedOutput schema / properties / http_status / title
```
Removed value: -"Http Status"
```
removedOutput schema / properties / index_reason / default
```
Removed value: -null
```
removedOutput schema / properties / index_reason / title
```
Removed value: -"Index Reason"
```
removedOutput schema / properties / index_status / default
```
Removed value: -null
```
removedOutput schema / properties / index_status / title
```
Removed value: -"Index Status"
```
removedOutput schema / properties / index_version / default
```
Removed value: -null
```
removedOutput schema / properties / index_version / title
```
Removed value: -"Index Version"
```
removedOutput schema / properties / missing_env / default
```
Removed value: -null
```
removedOutput schema / properties / missing_env / title
```
Removed value: -"Missing Env"
```
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 / 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: -"ListCachedOutput"
```

Addedv3.2.0Jul 25, 2026
Removedv3.1.3Jul 18, 2026
First observedv1.0.0Jul 11, 2026

TDQS

A4.2/5.0

Behavior5/5

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

The readOnlyHint annotation is reinforced and expanded with meaningful behavioral detail: it never touches the network and never scans loose files, and it operates only on the current cache index for DOI-proven entries. This goes well beyond what the annotation alone provides.

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 a single front-loaded sentence with no filler. The core action, target resource, and key behavioral constraints are all delivered compactly and in logical order.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple read-only list operation with one optional parameter, the description is mostly adequate and the absence of an output schema is mitigated by the clear 'List... downloads' phrasing. However, the role of download_dir is completely undocumented, leaving ambiguity about whether a custom path changes the index or selects a different cache.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

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

Schema description coverage is 0%, and the description never mentions the optional download_dir parameter. While the parameter name hints at a directory, the description does not explain how it relates to the 'current cache index' or what null/default behavior means, so the low-coverage burden is not met.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('List'), a specific resource ('DOI-proven cached downloads from the current cache index'), and adds explicit exclusions ('without touching the network or scanning loose files'). This clearly separates it from fetching, resolving, and single-item retrieval siblings.

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

Usage Guidelines4/5

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

The description clearly conveys when to use it: when the agent wants cached, DOI-proven downloads without network access or loose-file scanning. It does not explicitly name alternatives or state when not to use it, but the context is strong enough to guide selection.

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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