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TypeScript
Hybrid

packageSearch

Read-onlyIdempotent

Search for NPM or Python packages by name to get repository URLs, check deprecation status, and compare alternatives. Returns direct links to source code for further exploration.

Instructions

Find NPM/Python packages [EXTERNAL: npm/PyPI]

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
queriesYesResearch queries for packageSearch (1-3 queries per call for optimal resource management). Review schema before use for optimal results
responseCharOffsetNoCharacter offset for top-level bulk response pagination across results[]. Use when a multi-query response was auto-paginated.
responseCharLengthNoCharacter budget for top-level bulk response pagination across results[]. Overrides the shared default for this call.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultsYesArray of results, one per input query, discriminated by status
responsePaginationNoPagination metadata for top-level bulk response pagination across results[]

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed4 schema fields changedv9.1.1
    • changedInput schema / properties / queries / items / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "ecosystem": {
-        "const": "npm",
-        "type": "string"
-      },
-      "mainResearchGoal": {
-        "type": "string"
-      },
-      "name": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "npmFetchMetadata": {
-        "default": false,
-        "type": "boolean"
-      },
-      "reasoning": {
-        "type": "string"
-      },
-      "researchGoal": {
-        "type": "string"
-      },
-      "searchLimit": {
-        "default": 1,
-        "maximum": 10,
-        "minimum": 1,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "mainResearchGoal",
-      "researchGoal",
-      "reasoning",
-      "name",
-      "ecosystem"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "ecosystem": {
-        "const": "python",
-        "type": "string"
-      },
-      "mainResearchGoal": {
-        "$ref": "#/properties/queries/items/anyOf/0/properties/mainResearchGoal"
-      },
-      "name": {
-        "$ref": "#/properties/queries/items/anyOf/0/properties/name"
-      },
-      "pythonFetchMetadata": {
-        "default": false,
-        "type": "boolean"
-      },
-      "reasoning": {
-        "$ref": "#/properties/queries/items/anyOf/0/properties/reasoning"
-      },
-      "researchGoal": {
-        "$ref": "#/properties/queries/items/anyOf/0/properties/researchGoal"
-      },
-      "searchLimit": {
-        "$ref": "#/properties/queries/items/anyOf/0/properties/searchLimit"
-      }
-    },
-    "required": [
-      "mainResearchGoal",
-      "researchGoal",
-      "reasoning",
-      "name",
-      "ecosystem"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "properties": {
+      "charLength": {
+        "description": "Character budget for output pagination.",
+        "maximum": 50000,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "charOffset": {
+        "description": "Character offset for output pagination.",
+        "maximum": 9007199254740991,
+        "minimum": 0,
+        "type": "integer"
+      },
+      "ecosystem": {
+        "const": "npm",
+        "description": "\"npm\" or \"python\"",
+        "type": "string"
+      },
+      "id": {
+        "description": "Stable query identifier used to match each result to its input query. Required for every query. Use a short meaningful string like \"react_hooks_search\" or \"router_prs\".",
+        "maxLength": 120,
+        "minLength": 1,
+        "pattern": "^[A-Za-z0-9._:-]+$",
+        "type": "string"
+      },
+      "mainResearchGoal": {
+        "description": "Main research objective (multiple queries can share the same main goal for semantic grouping and session tracking)",
+        "type": "string"
+      },
+      "name": {
+        "description": "Package name or search term",
+        "minLength": 1,
+        "type": "string"
+      },
+      "npmFetchMetadata": {
+        "default": false,
+        "description": "Fetch detailed NPM metadata (slower)",
+        "type": "boolean"
+      },
+      "reasoning": {
+        "description": "Why this query helps achieve the goal",
+        "type": "string"
+      },
+      "researchGoal": {
+        "description": "Specific information this query seeks",
+        "type": "string"
+      },
+      "searchLimit": {
+        "default": 1,
+        "description": "Max results for NPM (1-10). Python: always 1. Default: 1",
+        "maximum": 10,
+        "minimum": 1,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "id",
+      "mainResearchGoal",
+      "researchGoal",
+      "reasoning",
+      "name",
+      "ecosystem"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "charLength": {
+        "description": "Character budget for output pagination.",
+        "maximum": 50000,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "charOffset": {
+        "description": "Character offset for output pagination.",
+        "maximum": 9007199254740991,
+        "minimum": 0,
+        "type": "integer"
+      },
+      "ecosystem": {
+        "const": "python",
+        "description": "\"npm\" or \"python\"",
+        "type": "string"
+      },
+      "id": {
+        "description": "Stable query identifier used to match each result to its input query. Required for every query. Use a short meaningful string like \"react_hooks_search\" or \"router_prs\".",
+        "maxLength": 120,
+        "minLength": 1,
+        "pattern": "^[A-Za-z0-9._:-]+$",
+        "type": "string"
+      },
+      "mainResearchGoal": {
+        "description": "Main research objective (multiple queries can share the same main goal for semantic grouping and session tracking)",
+        "type": "string"
+      },
+      "name": {
+        "description": "Package name or search term",
+        "minLength": 1,
+        "type": "string"
+      },
+      "pythonFetchMetadata": {
+        "default": false,
+        "description": "Fetch full metadata (version, author, license)",
+        "type": "boolean"
+      },
+      "reasoning": {
+        "description": "Why this query helps achieve the goal",
+        "type": "string"
+      },
+      "researchGoal": {
+        "description": "Specific information this query seeks",
+        "type": "string"
+      },
+      "searchLimit": {
+        "default": 1,
+        "description": "Max results for NPM (1-10). Python: always 1. Default: 1",
+        "maximum": 10,
+        "minimum": 1,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "id",
+      "mainResearchGoal",
+      "researchGoal",
+      "reasoning",
+      "name",
+      "ecosystem"
+    ],
+    "type": "object"
+  }
+]
    • addedInput schema / properties / responseCharLength
      Added value: +{
+  "description": "Character budget for top-level bulk response pagination across results[]. Overrides the shared default for this call.",
+  "maximum": 50000,
+  "minimum": 1,
+  "type": "integer"
+}
    • addedInput schema / properties / responseCharOffset
      Added value: +{
+  "description": "Character offset for top-level bulk response pagination across results[]. Use when a multi-query response was auto-paginated.",
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "responsePagination": {
+      "additionalProperties": false,
+      "description": "Pagination metadata for top-level bulk response pagination across results[]",
+      "properties": {
+        "charLength": {
+          "description": "Character length of the current page",
+          "maximum": 9007199254740991,
+          "minimum": 0,
+          "type": "integer"
+        },
+        "charOffset": {
+          "description": "Character offset of the current page",
+          "maximum": 9007199254740991,
+          "minimum": 0,
+          "type": "integer"
+        },
+        "currentPage": {
+          "description": "Current page number (1-indexed)",
+          "exclusiveMinimum": 0,
+          "maximum": 9007199254740991,
+          "type": "integer"
+        },
+        "hasMore": {
+          "description": "Whether more pages are available after the current page",
+          "type": "boolean"
+        },
+        "totalChars": {
+          "description": "Total number of characters in the full output",
+          "maximum": 9007199254740991,
+          "minimum": 0,
+          "type": "integer"
+        },
+        "totalPages": {
+          "description": "Total number of pages available",
+          "exclusiveMinimum": 0,
+          "maximum": 9007199254740991,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "currentPage",
+        "totalPages",
+        "hasMore",
+        "charOffset",
+        "charLength",
+        "totalChars"
+      ],
+      "type": "object"
+    },
+    "results": {
+      "description": "Array of results, one per input query, discriminated by status",
+      "items": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "data": {
+                "additionalProperties": false,
+                "description": "The tool-specific result data",
+                "properties": {
+                  "hints": {
+                    "description": "Contextual hints and suggestions for next steps or better queries",
+                    "items": {
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  "outputPagination": {
+                    "additionalProperties": false,
+                    "description": "Payload pagination metadata when the package list was size-paginated",
+                    "properties": {
+                      "charLength": {
+                        "description": "Character length of the current page",
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      },
+                      "charOffset": {
+                        "description": "Character offset of the current page",
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      },
+                      "currentPage": {
+                        "description": "Current page number (1-indexed)",
+                        "exclusiveMinimum": 0,
+                        "maximum": 9007199254740991,
+                        "type": "integer"
+                      },
+                      "hasMore": {
+                        "description": "Whether more pages are available after the current page",
+                        "type": "boolean"
+                      },
+                      "totalChars": {
+                        "description": "Total number of characters in the full output",
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      },
+                      "totalPages": {
+                        "description": "Total number of pages available",
+                        "exclusiveMinimum": 0,
+                        "maximum": 9007199254740991,
+                        "type": "integer"
+                      }
+                    },
+                    "required": [
+                      "currentPage",
+                      "totalPages",
+                      "hasMore",
+                      "charOffset",
+                      "charLength",
+                      "totalChars"
+                    ],
+                    "type": "object"
+                  },
+                  "packages": {
+                    "description": "Matching packages",
+                    "items": {
+                      "additionalProperties": false,
+                      "properties": {
+                        "author": {
+                          "description": "Package author",
+                          "type": "string"
+                        },
+                        "dependencies": {
+                          "additionalProperties": {
+                            "type": "string"
+                          },
+                          "description": "Declared dependencies",
+                          "propertyNames": {
+                            "type": "string"
+                          },
+                          "type": "object"
+                        },
+                        "description": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Package description"
+                        },
+                        "engines": {
+                          "additionalProperties": {
+                            "type": "string"
+                          },
+                          "description": "Engine requirements",
+                          "propertyNames": {
+                            "type": "string"
+                          },
+                          "type": "object"
+                        },
+                        "homepage": {
+                          "description": "Package homepage",
+                          "type": "string"
+                        },
+                        "keywords": {
+                          "description": "Package keywords",
+                          "items": {
+                            "type": "string"
+                          },
+                          "type": "array"
+                        },
+                        "lastPublished": {
+                          "description": "Last published timestamp",
+                          "type": "string"
+                        },
+                        "license": {
+                          "description": "Package license",
+                          "type": "string"
+                        },
+                        "mainEntry": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Main entry point for NPM packages"
+                        },
+                        "name": {
+                          "description": "Package name",
+                          "type": "string"
+                        },
+                        "owner": {
+                          "description": "Repository owner parsed from the repository URL",
+                          "type": "string"
+                        },
+                        "path": {
+                          "description": "NPM package path or repository subdirectory",
+                          "type": "string"
+                        },
+                        "peerDependencies": {
+                          "additionalProperties": {
+                            "type": "string"
+                          },
+                          "description": "Declared peer dependencies",
+                          "propertyNames": {
+                            "type": "string"
+                          },
+                          "type": "object"
+                        },
+                        "repo": {
+                          "description": "Repository name parsed from the repository URL",
+                          "type": "string"
+                        },
+                        "repoUrl": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Normalized repository URL when available"
+                        },
+                        "repository": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Repository URL when available"
+                        },
+                        "typeDefinitions": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Type definition entry point for NPM packages"
+                        },
+                        "version": {
+                          "description": "Package version",
+                          "type": "string"
+                        },
+                        "weeklyDownloads": {
+                          "description": "Weekly download count from npm registry",
+                          "maximum": 9007199254740991,
+                          "minimum": 0,
+                          "type": "integer"
+                        }
+                      },
+                      "required": [
+                        "name"
+                      ],
+                      "type": "object"
+                    },
+                    "type": "array"
+                  },
+                  "totalFound": {
+                    "description": "Total number of packages matching the search query",
+                    "maximum": 9007199254740991,
+                    "minimum": 0,
+                    "type": "integer"
+                  }
+                },
+                "required": [
+                  "packages"
+                ],
+                "type": "object"
+              },
+              "id": {
+                "description": "Stable query identifier matching the input query id",
+                "minLength": 1,
+                "type": "string"
+              },
+              "status": {
+                "const": "hasResults",
+                "description": "Indicates the query returned results successfully",
+                "type": "string"
+              }
+            },
+            "required": [
+              "id",
+              "status",
+              "data"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "data": {
+                "additionalProperties": {},
+                "description": "Empty result metadata (may contain hints or paging details)",
+                "properties": {},
+                "type": "object"
+              },
+              "id": {
+                "description": "Stable query identifier matching the input query id",
+                "minLength": 1,
+                "type": "string"
+              },
+              "status": {
+                "const": "empty",
+                "description": "Indicates the query returned no matching results",
+                "type": "string"
+              }
+            },
+            "required": [
+              "id",
+              "status",
+              "data"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "data": {
+                "additionalProperties": false,
+                "description": "Error details including message, type, and recovery hints",
+                "properties": {
+                  "cwd": {
+                    "description": "Working directory relevant to the error",
+                    "type": "string"
+                  },
+                  "error": {
+                    "anyOf": [
+                      {
+                        "type": "string"
+                      },
+                      {
+                        "additionalProperties": false,
+                        "properties": {
+                          "error": {
+                            "description": "GitHub API error message",
+                            "type": "string"
+                          },
+                          "hints": {
+                            "description": "Provider-specific hints",
+                            "items": {
+                              "type": "string"
+                            },
+                            "type": "array"
+                          },
+                          "rateLimitRemaining": {
+                            "description": "Remaining API requests in the current rate limit window",
+                            "type": "number"
+                          },
+                          "rateLimitReset": {
+                            "description": "Rate limit reset time in milliseconds since epoch",
+                            "type": "number"
+                          },
+                          "retryAfter": {
+                            "description": "Retry-after delay in seconds",
+                            "type": "number"
+                          },
+                          "scopesSuggestion": {
+                            "description": "Suggested scopes needed to resolve the error",
+                            "type": "string"
+                          },
+                          "status": {
+                            "description": "HTTP status code",
+                            "maximum": 9007199254740991,
+                            "minimum": -9007199254740991,
+                            "type": "integer"
+                          },
+                          "type": {
+                            "description": "GitHub API error category",
+                            "enum": [
+                              "http",
+                              "graphql",
+                              "network",
+                              "unknown"
+                            ],
+                            "type": "string"
+                          }
+                        },
+                        "required": [
+                          "error",
+                          "type"
+                        ],
+                        "type": "object"
+                      }
+                    ],
+                    "description": "Error message or API error object"
+                  },
+                  "errorCode": {
+                    "description": "Tool error code",
+                    "type": "string"
+                  },
+                  "errorType": {
+                    "description": "Tool-specific error type (e.g. symbol_not_found, size_limit)",
+                    "type": "string"
+                  },
+                  "hints": {
+                    "description": "Recovery hints",
+                    "items": {
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  "resolvedPath": {
+                    "description": "Resolved filesystem path involved in the error",
+                    "type": "string"
+                  },
+                  "searchRadius": {
+                    "description": "LSP search radius when symbol not found",
+                    "type": "number"
+                  }
+                },
+                "required": [
+                  "error"
+                ],
+                "type": "object"
+              },
+              "id": {
+                "description": "Stable query identifier matching the input query id",
+                "minLength": 1,
+                "type": "string"
+              },
+              "status": {
+                "const": "error",
+                "description": "Indicates the query encountered an error",
+                "type": "string"
+              }
+            },
+            "required": [
+              "id",
+              "status",
+              "data"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "results"
+  ],
+  "type": "object"
+}
  2. Changed7 schema fields changedv1.0.0
    • removedInput schema / properties / npmPackageName
      Removed value: -{
-  "description": "NPM package name to search for. Use this for searching NPM packages.",
-  "type": "string"
-}
    • removedInput schema / properties / npmPackagesNames
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "items": {
-        "type": "string"
-      },
-      "type": "array"
-    }
-  ],
-  "description": "Search terms for NPM packages only - supports multiple queries (e.g., \"react hooks\", [\"typescript\", \"eslint\"], \"data visualization\"). Optional when using other parameters."
-}
    • removedInput schema / properties / npmSearchStrategy
      Removed value: -{
-  "default": "individual",
-  "description": "NPM search strategy: \"individual\" runs separate searches for each term, \"combined\" searches all terms together. Default: individual",
-  "enum": [
-    "individual",
-    "combined"
-  ],
-  "type": "string"
-}
    • removedInput schema / properties / pythonPackageName
      Removed value: -{
-  "description": "Python package name to search for. Use this for searching Python packages on PyPI.",
-  "type": "string"
-}
    • addedInput schema / properties / queries
      Added value: +{
+  "description": "Research queries for packageSearch (1-3 queries per call for optimal resource management). Review schema before use for optimal results",
+  "items": {
+    "anyOf": [
+      {
+        "additionalProperties": false,
+        "properties": {
+          "ecosystem": {
+            "const": "npm",
+            "type": "string"
+          },
+          "mainResearchGoal": {
+            "type": "string"
+          },
+          "name": {
+            "minLength": 1,
+            "type": "string"
+          },
+          "npmFetchMetadata": {
+            "default": false,
+            "type": "boolean"
+          },
+          "reasoning": {
+            "type": "string"
+          },
+          "researchGoal": {
+            "type": "string"
+          },
+          "searchLimit": {
+            "default": 1,
+            "maximum": 10,
+            "minimum": 1,
+            "type": "integer"
+          }
+        },
+        "required": [
+          "mainResearchGoal",
+          "researchGoal",
+          "reasoning",
+          "name",
+          "ecosystem"
+        ],
+        "type": "object"
+      },
+      {
+        "additionalProperties": false,
+        "properties": {
+          "ecosystem": {
+            "const": "python",
+            "type": "string"
+          },
+          "mainResearchGoal": {
+            "$ref": "#/properties/queries/items/anyOf/0/properties/mainResearchGoal"
+          },
+          "name": {
+            "$ref": "#/properties/queries/items/anyOf/0/properties/name"
+          },
+          "pythonFetchMetadata": {
+            "default": false,
+            "type": "boolean"
+          },
+          "reasoning": {
+            "$ref": "#/properties/queries/items/anyOf/0/properties/reasoning"
+          },
+          "researchGoal": {
+            "$ref": "#/properties/queries/items/anyOf/0/properties/researchGoal"
+          },
+          "searchLimit": {
+            "$ref": "#/properties/queries/items/anyOf/0/properties/searchLimit"
+          }
+        },
+        "required": [
+          "mainResearchGoal",
+          "researchGoal",
+          "reasoning",
+          "name",
+          "ecosystem"
+        ],
+        "type": "object"
+      }
+    ]
+  },
+  "maxItems": 3,
+  "minItems": 1,
+  "type": "array"
+}
    • removedInput schema / properties / searchLimit
      Removed value: -{
-  "default": 20,
-  "description": "Results limit per query (1-50). Default: 20",
-  "maximum": 50,
-  "minimum": 1,
-  "type": "integer"
-}
    • addedInput schema / required
      Added value: +[
+  "queries"
+]
  3. First observed

TDQS

A4.8/5.0
Behavior5/5

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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior. The description adds critical behavioral details: searchLimit defaults (1 for known, 5 for alternatives), Python returns only 1 result, naming conventions (dashes vs underscores), and the need to check deprecation warnings. No contradictions.

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

Conciseness4/5

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

The description is well-structured with clear sections (titles, when, fromTool, toTool, vsGitHub, gotchas, examples). It is comprehensive without being overly verbose. Slightly more concise could be achieved, but it is appropriate for the tool's complexity.

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

Completeness5/5

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

Given the complexity of the tool (multi-parameter array, two ecosystems), the description covers all essential aspects: external APIs, behavior differences, pagination, deprecation, and integration with sibling tools. The schema and output schema handle the rest, leaving no gaps.

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

Parameters4/5

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

Schema coverage is 100% with detailed property descriptions. The description adds value through <gotchas> (e.g., Python always returns 1, naming conventions) and <examples> (concrete usage of name and ecosystem). This exceeds the baseline but not by a large margin.

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?

Title and description clearly state 'Find NPM/Python packages' and specify that it provides repository URLs. The <vsGitHub> section explicitly distinguishes from githubSearchRepositories, making the purpose specific and unambiguous.

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 <when> section lists clear use cases: lookup by name, get repo URL, compare alternatives, check deprecation. The <fromTool> and <toTool> sections provide chaining guidance, and <vsGitHub> advises using this tool first for known names versus githubSearchRepositories for broad discovery.

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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