dep-diff-mcp

Given one package and two versions (from -> to), returns a structured upgrade analysis: semver classification, GitHub release notes summary, detected breaking changes, security advisories fixed in the range, migration guide links, and a clear recommendation. Use when the user asks about a specific package upgrade ('what changed between react 18 and 19', 'is it safe to bump axios from 0.27 to 1.0', 'what does upgrading lodash 4.17.20 to 4.17.21 fix'). Supports npm, pypi, and github-actions (use the action reference as the name, e.g. actions/checkout). For analyzing many packages at once or a Dependabot batch, use analyze_packages_bulk instead.

{
  "type": "object",
  "properties": {
    "ecosystem": {
      "type": "string",
      "enum": [
        "npm",
        "pypi",
        "github-actions"
      ],
      "description": "Package ecosystem"
    },
    "name": {
      "type": "string",
      "minLength": 1,
      "description": "Package name (e.g. 'react', 'requests')"
    },
    "fromVersion": {
      "type": "string",
      "minLength": 1,
      "description": "Current version (e.g. '18.2.0')"
    },
    "toVersion": {
      "type": "string",
      "minLength": 1,
      "description": "Target version (e.g. '19.0.0')"
    }
  },
  "required": [
    "ecosystem",
    "name",
    "fromVersion",
    "toVersion"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "package": {
      "type": "string",
      "description": "Package name that was analyzed"
    },
    "ecosystem": {
      "type": "string",
      "enum": [
        "npm",
        "pypi",
        "github-actions"
      ],
      "description": "Package ecosystem"
    },
    "fromVersion": {
      "type": "string",
      "description": "Version being upgraded from"
    },
    "toVersion": {
      "type": "string",
      "description": "Version being upgraded to"
    },
    "semverClass": {
      "type": "string",
      "enum": [
        "major",
        "minor",
        "patch",
        "downgrade",
        "unknown"
      ],
      "description": "Semver relationship between the two versions"
    },
    "repoUrl": {
      "description": "Source repository URL, or null when none could be resolved",
      "type": [
        "string",
        "null"
      ]
    },
    "releaseCount": {
      "type": "number",
      "description": "Number of GitHub releases found strictly between the two versions"
    },
    "breakingChanges": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Breaking changes extracted from release notes; empty when none were found"
    },
    "releaseExcerpts": {
      "description": "Raw release-note excerpts, present only as a fallback when a major/minor bump yielded no breaking changes",
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "tag": {
            "type": "string",
            "description": "Release tag the excerpt came from"
          },
          "excerpt": {
            "type": "string",
            "description": "Short excerpt of the release notes"
          }
        },
        "required": [
          "tag",
          "excerpt"
        ],
        "additionalProperties": false
      }
    },
    "securityFixes": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string",
            "description": "Advisory identifier (e.g. 'GHSA-29mw-wpgm-hmr9' or a CVE)"
          },
          "summary": {
            "type": "string",
            "description": "One-line description of the advisory"
          },
          "severity": {
            "type": "string",
            "description": "Severity as reported by OSV (e.g. 'LOW', 'MODERATE', 'HIGH', 'CRITICAL')"
          }
        },
        "required": [
          "id",
          "summary",
          "severity"
        ],
        "additionalProperties": false
      },
      "description": "Advisories affecting fromVersion that are resolved at toVersion"
    },
    "migrationLinks": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Migration or upgrade guide URLs found in release notes"
    },
    "recommendation": {
      "type": "string",
      "description": "Single-line verdict explaining the recommendation level"
    },
    "recommendationLevel": {
      "type": "string",
      "enum": [
        "safe",
        "likely-safe",
        "review",
        "caution",
        "security"
      ],
      "description": "Risk classification, used to rank packages in bulk results"
    }
  },
  "required": [
    "package",
    "ecosystem",
    "fromVersion",
    "toVersion",
    "semverClass",
    "repoUrl",
    "releaseCount",
    "breakingChanges",
    "securityFixes",
    "migrationLinks",
    "recommendation",
    "recommendationLevel"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false
}

Analyzes a list of package upgrades in parallel and returns a unified risk report with packages ranked by recommendation level (security > caution > review > likely-safe > safe). Use when the user provides many dependency changes from a Dependabot PR, npm outdated output, lockfile diff, or batch upgrade. Returns: total count, breakdown by semver class, total security fixes found, packages with breaking changes, and per-package details. Limit 50 packages per call (chunk larger lists).

{
  "type": "object",
  "properties": {
    "changes": {
      "minItems": 1,
      "maxItems": 50,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "ecosystem": {
            "type": "string",
            "enum": [
              "npm",
              "pypi",
              "github-actions"
            ],
            "description": "Package ecosystem"
          },
          "name": {
            "type": "string",
            "minLength": 1
          },
          "fromVersion": {
            "type": "string",
            "minLength": 1
          },
          "toVersion": {
            "type": "string",
            "minLength": 1
          }
        },
        "required": [
          "ecosystem",
          "name",
          "fromVersion",
          "toVersion"
        ]
      },
      "description": "List of package changes to analyze"
    }
  },
  "required": [
    "changes"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "totalPackages": {
      "type": "number",
      "description": "Number of package changes submitted"
    },
    "bySemverClass": {
      "type": "object",
      "properties": {
        "major": {
          "type": "number",
          "description": "Count of major bumps"
        },
        "minor": {
          "type": "number",
          "description": "Count of minor bumps"
        },
        "patch": {
          "type": "number",
          "description": "Count of patch bumps"
        }
      },
      "required": [
        "major",
        "minor",
        "patch"
      ],
      "additionalProperties": false,
      "description": "Breakdown of the batch by semver class"
    },
    "securityFixesTotal": {
      "type": "number",
      "description": "Total security advisories resolved across the whole batch"
    },
    "packagesWithBreakingChanges": {
      "type": "number",
      "description": "How many packages had at least one breaking change"
    },
    "packages": {
      "type": "array",
      "items": {
        "anyOf": [
          {
            "type": "object",
            "properties": {
              "package": {
                "type": "string",
                "description": "Package name that was analyzed"
              },
              "ecosystem": {
                "type": "string",
                "enum": [
                  "npm",
                  "pypi",
                  "github-actions"
                ],
                "description": "Package ecosystem"
              },
              "fromVersion": {
                "type": "string",
                "description": "Version being upgraded from"
              },
              "toVersion": {
                "type": "string",
                "description": "Version being upgraded to"
              },
              "semverClass": {
                "type": "string",
                "enum": [
                  "major",
                  "minor",
                  "patch",
                  "downgrade",
                  "unknown"
                ],
                "description": "Semver relationship between the two versions"
              },
              "repoUrl": {
                "description": "Source repository URL, or null when none could be resolved",
                "type": [
                  "string",
                  "null"
                ]
              },
              "releaseCount": {
                "type": "number",
                "description": "Number of GitHub releases found strictly between the two versions"
              },
              "breakingChanges": {
                "type": "array",
                "items": {
                  "type": "string"
                },
                "description": "Breaking changes extracted from release notes; empty when none were found"
              },
              "releaseExcerpts": {
                "description": "Raw release-note excerpts, present only as a fallback when a major/minor bump yielded no breaking changes",
                "type": "array",
                "items": {
                  "type": "object",
                  "properties": {
                    "tag": {
                      "type": "string",
                      "description": "Release tag the excerpt came from"
                    },
                    "excerpt": {
                      "type": "string",
                      "description": "Short excerpt of the release notes"
                    }
                  },
                  "required": [
                    "tag",
                    "excerpt"
                  ],
                  "additionalProperties": false
                }
              },
              "securityFixes": {
                "type": "array",
                "items": {
                  "type": "object",
                  "properties": {
                    "id": {
                      "type": "string",
                      "description": "Advisory identifier (e.g. 'GHSA-29mw-wpgm-hmr9' or a CVE)"
                    },
                    "summary": {
                      "type": "string",
                      "description": "One-line description of the advisory"
                    },
                    "severity": {
                      "type": "string",
                      "description": "Severity as reported by OSV (e.g. 'LOW', 'MODERATE', 'HIGH', 'CRITICAL')"
                    }
                  },
                  "required": [
                    "id",
                    "summary",
                    "severity"
                  ],
                  "additionalProperties": false
                },
                "description": "Advisories affecting fromVersion that are resolved at toVersion"
              },
              "migrationLinks": {
                "type": "array",
                "items": {
                  "type": "string"
                },
                "description": "Migration or upgrade guide URLs found in release notes"
              },
              "recommendation": {
                "type": "string",
                "description": "Single-line verdict explaining the recommendation level"
              },
              "recommendationLevel": {
                "type": "string",
                "enum": [
                  "safe",
                  "likely-safe",
                  "review",
                  "caution",
                  "security"
                ],
                "description": "Risk classification, used to rank packages in bulk results"
              }
            },
            "required": [
              "package",
              "ecosystem",
              "fromVersion",
              "toVersion",
              "semverClass",
              "repoUrl",
              "releaseCount",
              "breakingChanges",
              "securityFixes",
              "migrationLinks",
              "recommendation",
              "recommendationLevel"
            ],
            "additionalProperties": false
          },
          {
            "type": "object",
            "properties": {
              "package": {
                "type": "string",
                "description": "Package name whose analysis failed"
              },
              "error": {
                "type": "string",
                "description": "Why the analysis could not be completed"
              },
              "recommendationLevel": {
                "type": "string",
                "const": "review",
                "description": "Always 'review' — a package that could not be analyzed cannot be cleared automatically"
              }
            },
            "required": [
              "package",
              "error",
              "recommendationLevel"
            ],
            "additionalProperties": false
          }
        ]
      },
      "description": "Per-package results, ranked security > caution > review > likely-safe > safe"
    }
  },
  "required": [
    "totalPackages",
    "bySemverClass",
    "securityFixesTotal",
    "packagesWithBreakingChanges",
    "packages"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false
}