A code-analysis server that helps an agent understand how a codebase is organised and how its parts relate. It uses language-server technology, the same kind of tooling behind features such as code navigation in editors.

Use it to explore a codebase, navigate between related definitions and references, understand code structure, and get refactoring suggestions.

It reduces the need to search through files manually when locating code or planning changes. It can also suggest ways to refactor existing code.

serena — Plugin by anthropics

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add plugins/anthropics/claude-plugins-official/serena

Claude Code

/plugin marketplace add anthropics/claude-plugins-official

Clone the repo

git clone --depth 1 https://github.com/anthropics/claude-plugins-official

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

serena scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

serena — 100% identical, 0 lines differ
serena — 100% identical, 0 lines differ

external_plugins/serena/.claude-plugin/plugin.json · 8 lines

What it actually says

{
  "name": "serena",
  "description": "Semantic code analysis MCP server providing intelligent code understanding, refactoring suggestions, and codebase navigation through language server protocol integration.",
  "author": {
    "name": "Oraios"
  }
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 8 lines scan A a046a275ba70

Subscribe to this mod's changes

serena is a plugin published in the GitHub repository anthropics/claude-plugins-official (35,577 stars, last pushed 3d ago), licensed Apache-2.0. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

claude-code mcp skills

serena

Getting it into your agent

Grade A, and why

Nothing flagged

Copies of this mod

What it actually says

What this file has done since we first saw it

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