jdx for Claude Code

Set up in two commands#

1. Install jdx (needs JDK 21+):

$ curl -fsSL https://raw.githubusercontent.com/MohammadMD1383/jdx/main/install-release.sh | bash

2. Wire it into Claude Code, then restart Claude Code:

$ jdx setup --agent claude-code --scope project

What it writes: Claude Code writes the mcpServers.jdx entry into .mcp.json (project) or ~/.claude.json (system).

Check, scope and remove#

• jdx setup --agent claude-code --scope system — Or wire it for every project (user-global config).
• jdx setup --agent claude-code --scope project --check — Report whether it is wired, without writing anything.
• jdx setup --agent claude-code --scope project --remove — Remove the entry again (other entries are never touched).

Re-running is a no-op, and unrelated entries in the config are merged, never clobbered.

What Claude Code can then do#

Claude Code gets 21 typed tools:

• jdx_show — Go to declaration: the class card for a type (kind, supertypes, source, provenance).
• jdx_members — List the members of a type — the '.' completion equivalent.
• jdx_outline — File Structure: one dense line per member declared on a type (never inherited).
• jdx_body — Open the method: the source body of one member, sliced verbatim with provenance.
• jdx_source — Open the file: whole source for a type, or a slice of it, with provenance.
• jdx_signature — Parameter info: one signature line per overload, with real parameter names.
• jdx_doc — Quick documentation for a type or member, falling back to the nearest documenting supertype like IntelliJ quick-doc.
• jdx_search — Search everywhere: symbols by glob, regex or fuzzy name, with did-you-mean.
• jdx_resolve — What is this symbol?
• jdx_ls — External library browser: packages in the workspace roots.
• jdx_tree — External library browser: artifacts and their package trees.
• jdx_usages — Find usages of a type or member across the workspace jars and source dirs.
• jdx_hierarchy — Type hierarchy: supertypes upward and subtypes downward across the workspace.
• jdx_implementors — Who implements this interface or extends this class, transitively.
• jdx_callers — Call hierarchy in: who calls this method, as a depth-bounded tree.
• jdx_calls — Call hierarchy out: what this method calls, as a depth-bounded tree.
• jdx_samples — How is this symbol really used?
• jdx_diff — What changed between two artifacts?
• jdx_version — The jdx version this server was built as.
• jdx_doctor — Environment report.
• jdx_health — Liveness probe: uptime, workspace served and queries answered.

Prefer the CLI? Paste the agent cheat sheet into Claude Code's instructions instead.