Metadata-Version: 2.4
Name: lynx-mcp
Version: 1.3.0
Summary: 100% local MCP server for semantic + lexical code search: AST-aware chunking (tree-sitter), hybrid BM25+dense retrieval, optional code knowledge graph.
Author: Lorenzo Cambiaghi
License:                                  Apache License
                                   Version 2.0, January 2004
                                http://www.apache.org/licenses/
        
           TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
        
           1. Definitions.
        
              "License" shall mean the terms and conditions for use, reproduction,
              and distribution as defined by Sections 1 through 9 of this document.
        
              "Licensor" shall mean the copyright owner or entity authorized by
              the copyright owner that is granting the License.
        
              "Legal Entity" shall mean the union of the acting entity and all
              other entities that control, are controlled by, or are under common
              control with that entity. For the purposes of this definition,
              "control" means (i) the power, direct or indirect, to cause the
              direction or management of such entity, whether by contract or
              otherwise, or (ii) ownership of fifty percent (50%) or more of the
              outstanding shares, or (iii) beneficial ownership of such entity.
        
              "You" (or "Your") shall mean an individual or Legal Entity
              exercising permissions granted by this License.
        
              "Source" form shall mean the preferred form for making modifications,
              including but not limited to software source code, documentation
              source, and configuration files.
        
              "Object" form shall mean any form resulting from mechanical
              transformation or translation of a Source form, including but
              not limited to compiled object code, generated documentation,
              and conversions to other media types.
        
              "Work" shall mean the work of authorship, whether in Source or
              Object form, made available under the License, as indicated by a
              copyright notice that is included in or attached to the work
              (an example is provided in the Appendix below).
        
              "Derivative Works" shall mean any work, whether in Source or Object
              form, that is based on (or derived from) the Work and for which the
              editorial revisions, annotations, elaborations, or other modifications
              represent, as a whole, an original work of authorship. For the purposes
              of this License, Derivative Works shall not include works that remain
              separable from, or merely link (or bind by name) to the interfaces of,
              the Work and Derivative Works thereof.
        
              "Contribution" shall mean any work of authorship, including
              the original version of the Work and any modifications or additions
              to that Work or Derivative Works thereof, that is intentionally
              submitted to Licensor for inclusion in the Work by the copyright owner
              or by an individual or Legal Entity authorized to submit on behalf of
              the copyright owner. For the purposes of this definition, "submitted"
              means any form of electronic, verbal, or written communication sent
              to the Licensor or its representatives, including but not limited to
              communication on electronic mailing lists, source code control systems,
              and issue tracking systems that are managed by, or on behalf of, the
              Licensor for the purpose of discussing and improving the Work, but
              excluding communication that is conspicuously marked or otherwise
              designated in writing by the copyright owner as "Not a Contribution."
        
              "Contributor" shall mean Licensor and any individual or Legal Entity
              on behalf of whom a Contribution has been received by Licensor and
              subsequently incorporated within the Work.
        
           2. Grant of Copyright License. Subject to the terms and conditions of
              this License, each Contributor hereby grants to You a perpetual,
              worldwide, non-exclusive, no-charge, royalty-free, irrevocable
              copyright license to reproduce, prepare Derivative Works of,
              publicly display, publicly perform, sublicense, and distribute the
              Work and such Derivative Works in Source or Object form.
        
           3. Grant of Patent License. Subject to the terms and conditions of
              this License, each Contributor hereby grants to You a perpetual,
              worldwide, non-exclusive, no-charge, royalty-free, irrevocable
              (except as stated in this section) patent license to make, have made,
              use, offer to sell, sell, import, and otherwise transfer the Work,
              where such license applies only to those patent claims licensable
              by such Contributor that are necessarily infringed by their
              Contribution(s) alone or by combination of their Contribution(s)
              with the Work to which such Contribution(s) was submitted. If You
              institute patent litigation against any entity (including a
              cross-claim or counterclaim in a lawsuit) alleging that the Work
              or a Contribution incorporated within the Work constitutes direct
              or contributory patent infringement, then any patent licenses
              granted to You under this License for that Work shall terminate
              as of the date such litigation is filed.
        
           4. Redistribution. You may reproduce and distribute copies of the
              Work or Derivative Works thereof in any medium, with or without
              modifications, and in Source or Object form, provided that You
              meet the following conditions:
        
              (a) You must give any other recipients of the Work or
                  Derivative Works a copy of this License; and
        
              (b) You must cause any modified files to carry prominent notices
                  stating that You changed the files; and
        
              (c) You must retain, in the Source form of any Derivative Works
                  that You distribute, all copyright, patent, trademark, and
                  attribution notices from the Source form of the Work,
                  excluding those notices that do not pertain to any part of
                  the Derivative Works; and
        
              (d) If the Work includes a "NOTICE" text file as part of its
                  distribution, then any Derivative Works that You distribute must
                  include a readable copy of the attribution notices contained
                  within such NOTICE file, excluding those notices that do not
                  pertain to any part of the Derivative Works, in at least one
                  of the following places: within a NOTICE text file distributed
                  as part of the Derivative Works; within the Source form or
                  documentation, if provided along with the Derivative Works; or,
                  within a display generated by the Derivative Works, if and
                  wherever such third-party notices normally appear. The contents
                  of the NOTICE file are for informational purposes only and
                  do not modify the License. You may add Your own attribution
                  notices within Derivative Works that You distribute, alongside
                  or as an addendum to the NOTICE text from the Work, provided
                  that such additional attribution notices cannot be construed
                  as modifying the License.
        
              You may add Your own copyright statement to Your modifications and
              may provide additional or different license terms and conditions
              for use, reproduction, or distribution of Your modifications, or
              for any such Derivative Works as a whole, provided Your use,
              reproduction, and distribution of the Work otherwise complies with
              the conditions stated in this License.
        
           5. Submission of Contributions. Unless You explicitly state otherwise,
              any Contribution intentionally submitted for inclusion in the Work
              by You to the Licensor shall be under the terms and conditions of
              this License, without any additional terms or conditions.
              Notwithstanding the above, nothing herein shall supersede or modify
              the terms of any separate license agreement you may have executed
              with Licensor regarding such Contributions.
        
           6. Trademarks. This License does not grant permission to use the trade
              names, trademarks, service marks, or product names of the Licensor,
              except as required for reasonable and customary use in describing the
              origin of the Work and reproducing the content of the NOTICE file.
        
           7. Disclaimer of Warranty. Unless required by applicable law or
              agreed to in writing, Licensor provides the Work (and each
              Contributor provides its Contributions) on an "AS IS" BASIS,
              WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
              implied, including, without limitation, any warranties or conditions
              of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
              PARTICULAR PURPOSE. You are solely responsible for determining the
              appropriateness of using or redistributing the Work and assume any
              risks associated with Your exercise of permissions under this License.
        
           8. Limitation of Liability. In no event and under no legal theory,
              whether in tort (including negligence), contract, or otherwise,
              unless required by applicable law (such as deliberate and grossly
              negligent acts) or agreed to in writing, shall any Contributor be
              liable to You for damages, including any direct, indirect, special,
              incidental, or consequential damages of any character arising as a
              result of this License or out of the use or inability to use the
              Work (including but not limited to damages for loss of goodwill,
              work stoppage, computer failure or malfunction, or any and all
              other commercial damages or losses), even if such Contributor
              has been advised of the possibility of such damages.
        
           9. Accepting Warranty or Additional Liability. While redistributing
              the Work or Derivative Works thereof, You may choose to offer,
              and charge a fee for, acceptance of support, warranty, indemnity,
              or other liability obligations and/or rights consistent with this
              License. However, in accepting such obligations, You may act only
              on Your own behalf and on Your sole responsibility, not on behalf
              of any other Contributor, and only if You agree to indemnify,
              defend, and hold each Contributor harmless for any liability
              incurred by, or claims asserted against, such Contributor by reason
              of your accepting any such warranty or additional liability.
        
           END OF TERMS AND CONDITIONS
        
           APPENDIX: How to apply the Apache License to your work.
        
              To apply the Apache License to your work, attach the following
              boilerplate notice, with the fields enclosed by brackets "[]"
              replaced with your own identifying information. (Don't include
              the brackets!)  The text should be enclosed in the appropriate
              comment syntax for the file format. We also recommend that a
              file or class name and description of purpose be included on the
              same "printed page" as the copyright notice for easier
              identification within third-party archives.
        
           Copyright 2026 Lorenzo Cambiaghi
        
           Licensed under the Apache License, Version 2.0 (the "License");
           you may not use this file except in compliance with the License.
           You may obtain a copy of the License at
        
               http://www.apache.org/licenses/LICENSE-2.0
        
           Unless required by applicable law or agreed to in writing, software
           distributed under the License is distributed on an "AS IS" BASIS,
           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
           See the License for the specific language governing permissions and
           limitations under the License.
        
Project-URL: Homepage, https://github.com/lorenzo-cambiaghi/LynxMCP
Project-URL: Repository, https://github.com/lorenzo-cambiaghi/LynxMCP
Project-URL: Issues, https://github.com/lorenzo-cambiaghi/LynxMCP/issues
Keywords: mcp,mcp-server,model-context-protocol,rag,code-search,codebase,semantic-search,knowledge-graph,tree-sitter,bm25,local,claude,cursor
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: Apache Software License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.10
Classifier: Programming Language :: Python :: 3.11
Classifier: Programming Language :: Python :: 3.12
Classifier: Programming Language :: Python :: 3.13
Classifier: Topic :: Software Development
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Requires-Python: >=3.10
Description-Content-Type: text/markdown
License-File: LICENSE
Requires-Dist: mcp
Requires-Dist: llama-index-core
Requires-Dist: llama-index-vector-stores-chroma
Requires-Dist: llama-index-embeddings-huggingface
Requires-Dist: chromadb
Requires-Dist: gitpython
Requires-Dist: watchdog
Requires-Dist: rank-bm25
Requires-Dist: tree-sitter>=0.25
Requires-Dist: tree-sitter-c-sharp
Requires-Dist: tree-sitter-python
Requires-Dist: tree-sitter-typescript
Requires-Dist: tree-sitter-javascript
Requires-Dist: tree-sitter-cpp
Requires-Dist: tree-sitter-c
Requires-Dist: tree-sitter-go
Requires-Dist: tree-sitter-rust
Requires-Dist: tree-sitter-java
Requires-Dist: tree-sitter-ruby
Requires-Dist: tree-sitter-php
Requires-Dist: tree-sitter-kotlin
Requires-Dist: tree-sitter-swift
Requires-Dist: networkx>=3.0
Requires-Dist: httpx>=0.27
Requires-Dist: beautifulsoup4>=4.12
Requires-Dist: trafilatura>=1.10
Requires-Dist: truststore>=0.10
Requires-Dist: pypdf>=4.0
Requires-Dist: sentence-transformers>=2.7
Requires-Dist: fastapi>=0.110
Provides-Extra: dev
Requires-Dist: pytest>=7; extra == "dev"
Requires-Dist: reportlab>=4; extra == "dev"
Provides-Extra: pdf-fast
Requires-Dist: pymupdf>=1.24; extra == "pdf-fast"
Provides-Extra: webdoc-js
Requires-Dist: playwright>=1.40; extra == "webdoc-js"
Dynamic: license-file

# Lynx

**A 100% local MCP server for semantic code search — AST-aware chunking, hybrid BM25 + dense retrieval, and an optional code knowledge graph. Works with any MCP client (Claude Code, Cursor, Windsurf, Antigravity, ...).**

[![Tests](https://github.com/lorenzo-cambiaghi/LynxMCP/actions/workflows/test.yml/badge.svg)](https://github.com/lorenzo-cambiaghi/LynxMCP/actions/workflows/test.yml)
[![License: Apache 2.0](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](LICENSE)
![Python 3.10+](https://img.shields.io/badge/python-3.10%2B-blue)

Your AI assistant greps file names and guesses. Lynx gives it real retrieval over **your code, your library docs, and your PDFs** — without a single byte leaving your machine.

- **AST-aware indexing** — tree-sitter parses 13+ languages and indexes whole functions/classes, not arbitrary text windows.
- **Hybrid retrieval** — dense embeddings + code-tokenized BM25, fused with RRF; optional cross-encoder reranker.
- **Code knowledge graph (opt-in)** — who-calls-what, inheritance, imports: ask "what breaks if I change this?" and get the actual blast radius.
- **Multi-source** — index codebases, public docs sites (fetched once, on demand; JS-rendered SPAs supported via optional headless Chromium), and PDFs side by side.
- **Live index** — a file watcher re-indexes saves in ~2s. No manual rebuild ritual.
- **Web manager UI** — `lynx manager ui` gives you guided setup, a query playground, diagnostics, and client config snippets.

*(Named after Lynceus, the Argonaut whose sharp eyes could find anything hidden.)*

## Quickstart

```bash
# 1. Install the CLI (isolated, no venv ritual)
pipx install lynx-mcp
#    or: uv tool install lynx-mcp

# 2. Create a config pointing at your project
lynx manager init

# 3. Build the index (downloads the ~130MB embedding model on first run)
lynx build
```

Then register Lynx in your MCP client (Claude Code shown; see the [full guide](docs/GUIDE.md) for Cursor, Antigravity, and generic stdio clients — or let `lynx manager ui` generate the snippet for you):

```json
{
  "mcpServers": {
    "lynx": {
      "command": "lynx",
      "args": ["serve", "--config", "/absolute/path/to/config.json"]
    }
  }
}
```

Prefer zero terminal? There are [double-click installers](https://github.com/lorenzo-cambiaghi/LynxMCP/releases) for macOS and Windows.

## The tools your AI gets

The tool set is **fixed** — it does not grow with the number of sources, so your client's tool list (and context window) stays small. Tools take a `source` argument where relevant.

| Tool | What it answers |
|------|-----------------|
| `search(query, source?)` | Primary hybrid search. Omit `source` to search every source at once (RRF-fused). |
| `deep_search(queries, source?)` | Escalation: tries multiple query phrasings until one passes a quality threshold. |
| `graph_query(operation, symbol?)` | `callers`, `callees`, `subclasses`, `superclasses`, `imports`, `neighbors`, `shortest_path`, `overview`, `surprising_connections`, `status`. |
| `find_definition(symbol)` | Where is X defined? (AST-precise when the graph is on, BM25 fallback otherwise.) |
| `find_usages(symbol)` | Every use of X — calls *and* non-call references (generics, decorators, docs). |
| `find_tests_for(symbol)` | Are there tests for X? |
| `find_similar(snippet)` | Does code like this already exist? |
| `search_diff(query, base?)` | Search only the files changed vs a base branch — built for code review. |
| `feedback(trying_to_do, tried, stuck)` | The agent files a report when the index couldn't answer — stored 100% locally, your signal for tuning sources. |
| `list_sources` / `get_rag_status` / `update_source_index` | Introspection and maintenance. |

All retrieval tools carry MCP `readOnlyHint` annotations (clients can auto-approve them), and the server ships its usage playbook in the MCP handshake (`instructions` + a `lynx://guide` resource) — your agent knows how to query well without any rules-file setup.

## How it works

```
your code ──► tree-sitter AST chunker ──► bge-small embeddings ──► ChromaDB
                                     └──► code-tokenized BM25 ─┐
query ───────────────────────────────────► RRF fusion ◄────────┘ ──► (optional reranker) ──► results
```

Everything runs locally: HuggingFace models are downloaded once, then Lynx switches to offline mode. No telemetry, no cloud index, no code upload. The only network access is the model download and the *explicit* `webdoc` fetch step you trigger yourself.

## Why not just let the agent grep?

Grep is great when you know the identifier. It fails when you (or the agent) know the *behavior*: "where do we clamp the camera zoom?" matches nothing literal. Agentic grep also burns tokens — every wrong file the agent opens is context spent. Lynx answers behavioral queries in one tool call with file + line + symbol citations, and the graph layer answers structural questions (callers, inheritance) that grep fundamentally cannot — polymorphic dispatch leaves no textual trace.

Honest counterpoint: on a small repo that fits in the agent's context, built-in tools are fine. Lynx pays off on large codebases, on framework docs your model's training data has gone stale on, and on repeated sessions where re-exploring from scratch is waste.

## Benchmarks (reproducible)

<img src="https://raw.githubusercontent.com/lorenzo-cambiaghi/LynxMCP/main/benchmarks/chart.svg" alt="Lynx vs agentic grep: -58% tokens to answer; 4 vs 101 tool calls to map a class hierarchy" width="980">

On the `django/` package of Django 5.2 (883 files, ~158k lines), 20 behavioral questions with known ground-truth files — full methodology, per-task results, and an intentionally *strong* grep baseline in [benchmarks/RESULTS.md](https://github.com/lorenzo-cambiaghi/LynxMCP/blob/main/benchmarks/RESULTS.md):

| | Agentic grep | Lynx |
|---|---|---|
| median tokens **to answer** (tool output + required follow-up read) | 4,150 | **1,725** |
| tool round-trips before the code is in context | 2+ | **1** (chunks included, with symbol + file:line + score) |
| hit@1 / MRR | 45% / 0.64 | 55% / 0.67 |
| *"what inherits from `Field`?"* — full descendant tree (100 classes) | **101 grep rounds** | **4 graph calls**, same recall, file:line per edge |

The ranking quality is comparable (Django's docstring-rich code is grep's best case — we say so in the report). The structural difference is not: every tool round-trip is a full model inference over the growing context, and class-relation questions force grep into one round per discovered class while `graph_query` reads resolved inheritance edges.

```bash
# reproduce
git clone --depth 1 --branch 5.2 https://github.com/django/django.git benchmarks/_target/django
python benchmarks/run_benchmark.py && python benchmarks/structural_demo.py
```

## Documentation

| | |
|---|---|
| [Full guide](docs/GUIDE.md) | Configuration, all source types (codebase / webdoc / PDF), retrieval internals, troubleshooting |
| [Manager UI](docs/GUIDE.md#lynxmanager--guided-setup-web-ui-diagnostics-new-in-v09) | Guided setup, playground, diagnostics |
| [config.example.json](config.example.json) | Annotated example configuration |

## Status

Actively developed by one author; APIs may still move before 1.x stabilizes. Issues and PRs welcome — the test suite runs with `pytest` and CI must stay green.

## License

[Apache 2.0](LICENSE)

<!-- MCP Registry ownership marker — must stay in the README published on
     PyPI so registry.modelcontextprotocol.io can verify the package.
mcp-name: io.github.lorenzo-cambiaghi/lynx
-->

