Maven Decoder
Lets AI agents read the real source of any Maven dependency, decompiled from ~/.m2 or Central.
The current version, v1.3.2, was published to the official MCP registry on 2026-09-09. It is distributed as maven-decoder-mcp on npm and as maven-decoder-mcp on PyPI, filed under Other by this index, and declares 7 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.
Using Maven Decoder in Claude, Cursor, Gemini CLI, Cline, or Zed?
MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).
Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less
uv tool install mcpindex-gate && mcpindex-config-wireVerdict not yet evaluated for this tool. The semantic screen takes adversarial cases first; coverage rolls out as the corpus expands (15/150 labels to graduation). The deterministic conformance probe is built but has not yet run on the public corpus, so a recorded verdict here is REVIEW or UNVERIFIED, never a clearing ALLOW. Until a verdict is recorded, an agent should treat this tool as not-yet-cleared and fall back to its own checks. Method: the eval, four-state verdict, honest limits.
Own this server? Screen its description →
That verdict was true at screening time (snapshot 2026-09-09).
Contracts can change after screening, with no version bump. The gate pins Maven Decoder’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.
See your first HOLD in 2 minutes →
Related: how to trust an MCP server · screen before install · silent contract drift
MAVEN_REPOSITORYPath to the local Maven repository. Defaults to ~/.m2/repository.
MAVEN_REMOTE_REPOSComma or whitespace separated list of remote Maven repository base URLs.
MAVEN_REMOTE_USERNAMEUsername for authenticating against private remote Maven repositories.
MAVEN_REMOTE_PASSWORDPassword or token for authenticating against private remote Maven repositories.
MAVEN_OFFLINESet to true to disable all network access and use only the local repository.
MAVEN_AUTO_DOWNLOADWhether to automatically download missing artifacts from remote repositories. Defaults to true.
MAVEN_DECODER_CACHE_DIROverride directory used for decompilation and metadata caches.
MAVEN_REPOSITORYPath to the local Maven repository. Defaults to ~/.m2/repository.
MAVEN_REMOTE_REPOSComma or whitespace separated list of remote Maven repository base URLs.
MAVEN_REMOTE_USERNAMEUsername for authenticating against private remote Maven repositories.
MAVEN_REMOTE_PASSWORDPassword or token for authenticating against private remote Maven repositories.
MAVEN_OFFLINESet to true to disable all network access and use only the local repository.
MAVEN_AUTO_DOWNLOADWhether to automatically download missing artifacts from remote repositories. Defaults to true.
MAVEN_DECODER_CACHE_DIROverride directory used for decompilation and metadata caches.
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