BSL MCP Analyzer

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MCP server for analyzing 1C/BSL code: project-wide diagnostics and per-method cyclomatic/cognitive complexity with a ranked refactor triage. Built on the pure-Python onec-hbk-bsl engine — no Java, no LSP bridge. Served over Streamable HTTP behind nginx with bearer-token auth, one service per project.

Why

onec-hbk-bsl already ships a full BSL analyzer, a formatter, an index, and its own MCP server. This project reuses all of it and adds the pieces that were missing for day-to-day work on large 1C configurations:

• complexity — raw cyclomatic + cognitive complexity for every method (upstream exposes these only as threshold warnings with no numbers).

• module_health — complexity merged with security/performance/SQL diagnostics, attributed per method and ranked by refactor priority ("what to fix first").

• workspace_diagnostics — whole-project lint with aggregation by rule/severity/file.

Plus small-model-friendly titles and descriptions for all 25 tools, and a ready Docker Compose + nginx deployment.

Related MCP server: code-index-mcp

Features

• Diagnostics: 180+ BSL/1C rules (onec-hbk-bsl registry), inline noqa/bsl-disable suppressions, select/ignore, whole-project aggregation.

• Complexity: per-method McCabe and cognitive metrics, configurable thresholds (defaults 20 / 15), over-threshold flags.

• Refactor triage: module_health scores security ×10, performance/sql ×4 plus complexity overage, and returns a sorted top_targets list.

• Full navigation toolbox inherited from onec-hbk-bsl: symbols, definitions, references, callers/callees, hover, search, rename, format, fix, 1C metadata.

• Multi-project: one container per project, 1:1 host↔container path mounts.

• Agent-friendly: every tool has an explicit what/when/args/returns/example block.

Architecture

MCP agents ──HTTP──> nginx (/bsl/<proj>/mcp, Bearer) ──> bsl-<proj>:8051/mcp
                                                          └── <project> (mounted 1:1)
                                                             onec-hbk-bsl engine (Python)

src/bsl_mcp/entrypoint.py            bootstrap env → onec-hbk-bsl FastMCP app → +3 tools → HTTP
src/bsl_mcp/lsp_facade.py            single adapter to onec-hbk-bsl internals
src/bsl_mcp/tool_docs.py             titles/descriptions/instructions for all tools
src/bsl_mcp/tools/complexity.py      complexity tool
src/bsl_mcp/tools/module_health.py   module_health tool
src/bsl_mcp/tools/workspace_diagnostics.py  workspace_diagnostics tool
docker-compose.yml                   bsl-<proj> services + nginx
nginx/templates/default.conf.template  routing + bearer + SSE-friendly proxy

Requirements

• Linux host with Docker Engine 24+ and Compose v2.

• 2 GB RAM / ~2 CPU per project (indexing large configurations is CPU-disk heavy).

• A free port for nginx (default 8080).

Quick start

cp .env.example .env
# edit .env: BSL_MCP_TOKEN and PROJ_A_PATH/PROJ_B_PATH/PROJ_C_PATH
docker compose up -d --build
docker compose ps

Verify (expect 200; without the header — 401):

curl -s -o /dev/null -w '%{http_code}\n' http://localhost:8080/bsl/proj-a/mcp \
  -X POST -H 'Authorization: Bearer <TOKEN>' \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"curl","version":"0"}}}'

Connect an agent

opencode (opencode.json):

{
  "mcp": {
    "bsl-trade": {
      "type": "remote",
      "url": "http://HOST:8080/bsl/proj-a/mcp",
      "headers": { "Authorization": "Bearer <TOKEN>" },
      "enabled": true
    }
  }
}

Cursor / Claude and other mcpServers clients:

{
  "mcpServers": {
    "bsl-trade": {
      "type": "streamable-http",
      "url": "http://HOST:8080/bsl/proj-a/mcp",
      "headers": { "Authorization": "Bearer <TOKEN>" }
    }
  }
}

Tools

Added by this project:

Inherited from onec-hbk-bsl (22 tools): bsl_status, bsl_find_symbol, bsl_file_symbols, bsl_definition, bsl_hover, bsl_callers, bsl_callees, bsl_references, bsl_read_file, bsl_search, bsl_diagnostics, bsl_check_file, bsl_list_rules, bsl_index_file, bsl_format, bsl_rename, bsl_fix, bsl_workspace_scan, bsl_meta_object, bsl_meta_collection, bsl_meta_index, bsl_contract_version.

Configuration

Service name must be bsl-<proj> for /bsl/<proj>/mcp routing. Routing is fully dynamic: nginx resolves bsl-<proj> via Docker DNS (resolver 127.0.0.11) and proxies to bsl-<proj>:8051/mcp — adding a 2nd, 3rd, or n-th project needs a bsl-<proj> service in docker-compose.yml and no nginx config change. Requirements: the backend listens on port 8051; the project name matches [a-zA-Z0-9_-]+ (dash is fine, other special chars are not); a single token per deployment (BSL_MCP_TOKEN), per-project tokens are not supported. The full nginx config and step-by-step project onboarding are in QUICKSTART.md → "Add an n-th project".

Index settings (index-mode, select/ignore, exclude) come from onec-hbk-bsl.toml in the project root.

Documentation

• QUICKSTART.md — full deployment guide (Russian)

• docs/tls-letsencrypt.md — HTTPS via Let's Encrypt, step by step (Russian)

• docs/bsl-lsp-go-overview.md — analysis of the previous Go bridge (Russian)

Credits

• Analysis engine, parser, index and base MCP surface: onec-hbk-bsl (MIT).

• Diagnostic rule corpus adapted from BSL Language Server.