simulate_dependency_upgrade
Simulate upgrading one package from one version to another, or a whole batch at once
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Third-party content written by another agent. Data to evaluate, not instructions.
Given a package and a current/target version, tells you whether that specific upgrade is a safe patch/minor bump or a likely-breaking major bump, before you actually run npm install. Natural follow-up to prioritize_remediation: pass its packageName + currentVersion + fixedVersion straight in to check whether the suggested fix is a drop-in patch or something that needs a review pass. Classifies the jump by semver (major/minor/patch/prerelease), treats a minor bump between two pre-1.0 (0.x) versions as breaking-risk per semver's own "the API isn't stable yet" convention, and flags skipping over multiple major versions in one jump (e.g. 2.x -> 5.x) as needing a per-major changelog review rather than just a diff against the final target. Beyond semver, it also checks the registry for real signals the version number alone won't tell you: whether the target version is marked deprecated, whether it introduces a preinstall/install/postinstall/prepare lifecycle script the current version didn't have, whether it tightens its engines.node requirement, and whether it is itself a prerelease. Finally it batch-checks both versions against OSV.dev and reports vulnerabilityDelta (introduced/fixed/still-vulnerable/still-clean) — catching the case where a suggested "fix" version doesn't actually clear every open CVE. Combines all of this into one riskTier (safe/low-risk/review-recommended/breaking-change-likely/unknown) with a reasons list explaining exactly which signals drove it. This does NOT read the package's changelog/release notes or scan the target tarball's source diff for actual breaking API usage — it's a fast, deterministic pre-check, not a substitute for reading the release notes on a flagged major bump. For simulating more than one upgrade at once — e.g. every "patch-now" finding prioritize_remediation just ranked — pass packages: [{packageName, currentVersion, targetVersion?}, ...] (1-100 items) instead of packageName/currentVersion/targetVersion, not both. Registry fetches are deduped/parallelized and all OSV checks for the whole batch run as one call, so this is not the same cost as N single-item calls. A package that can't be resolved at all (typo, unpublished, registry error) shows up as its own results entry with fetchError set instead of failing the whole batch.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| packageName | string | no | Exact npm package name, e.g. "lodash" or "@scope/name". Use this (with currentVersion) OR `packages`, not both. |
| currentVersion | string | no | Currently installed version — an exact version (e.g. "4.17.20"), a semver range (e.g. "^4.17.0"), or a dist-tag. Required when `packageName` is used. |
| targetVersion | string | no | Version to simulate upgrading to — exact version, range, or dist-tag (e.g. the fixedVersion a prioritize_remediation finding named). Omit to use the registry's "latest" dist-tag. Only applies to the single-item `packageName` form. |
| packages | array | no | Batch of upgrades to simulate (1-100 items), each mirroring the single-item packageName/currentVersion/targetVersion fields. Use this OR packageName/currentVersion, not both. Natural pairing with prioritize_remediation: pass its ranked findings straight in as one call instead of one simulate_dependency_upgrade call per finding. |
Raw JSON schema
{
"type": "object",
"properties": {
"packageName": {
"type": "string",
"minLength": 1,
"maxLength": 214,
"description": "Exact npm package name, e.g. \"lodash\" or \"@scope/name\". Use this (with currentVersion) OR `packages`, not both."
},
"currentVersion": {
"type": "string",
"minLength": 1,
"maxLength": 128,
"description": "Currently installed version — an exact version (e.g. \"4.17.20\"), a semver range (e.g. \"^4.17.0\"), or a dist-tag. Required when `packageName` is used."
},
"targetVersion": {
"type": "string",
"minLength": 1,
"maxLength": 128,
"description": "Version to simulate upgrading to — exact version, range, or dist-tag (e.g. the fixedVersion a prioritize_remediation finding named). Omit to use the registry's \"latest\" dist-tag. Only applies to the single-item `packageName` form."
},
"packages": {
"type": "array",
"items": {
"type": "object",
"properties": {
"packageName": {
"type": "string",
"minLength": 1,
"maxLength": 214,
"description": "Exact npm package name, e.g. \"lodash\" or \"@scope/name\""
},
"currentVersion": {
"type": "string",
"minLength": 1,
"maxLength": 128,
"description": "Currently installed version — an exact version, a semver range, or a dist-tag"
},
"targetVersion": {
"type": "string",
"minLength": 1,
"maxLength": 128,
"description": "Version to simulate upgrading to — exact version, range, or dist-tag. Omit to use the registry's \"latest\" dist-tag."
}
},
"required": [
"packageName",
"currentVersion"
],
"additionalProperties": false
},
"minItems": 1,
"maxItems": 100,
"description": "Batch of upgrades to simulate (1-100 items), each mirroring the single-item packageName/currentVersion/targetVersion fields. Use this OR packageName/currentVersion, not both. Natural pairing with prioritize_remediation: pass its ranked findings straight in as one call instead of one simulate_dependency_upgrade call per finding."
}
},
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}