Agentic Log Search Platform (MCP-Based)

A small Python project that ingests Windows application log files, indexes them for fast full-text search, and exposes the ingest and search operations as both HTTP endpoints (Flask) and MCP tools (FastMCP).

Project duration: Feb 14 – 20, 2026
Author: Bharath Kumar Kalavakunta

Features

• Agent-based design via FastMCP — two tools (ingest_logs, search_logs) callable from any MCP-compatible client

• Dual-backend indexing — Elasticsearch for fast full-text search; SQLite as the always-on metadata store and fallback

• Pandas data pipeline — parses and cleans 300+ sample log records before indexing

• Performance benchmark — /benchmark endpoint compares grep-style linear scan vs indexed search (~60 % faster)

• gRPC contract — a .proto file documents the agent-to-backend communication contract (illustrative; HTTP endpoints are the active interface)

• Test suite — 5 pytest cases covering parsing, indexing, and search (including the empty-result case)

Related MCP server: Log Analyzer MCP Server

Project Structure

.
├── app.py                  # Flask app + FastMCP tool definitions
├── core/
│   ├── log_ingestor.py     # LogIngestor: parse raw log files with Pandas
│   ├── log_indexer.py      # LogIndexer: write to Elasticsearch + SQLite
│   └── log_search_agent.py # LogSearchAgent: query indexed records
├── proto/
│   └── log_search.proto    # gRPC service contract (illustrative)
├── data/
│   ├── sample_app1.log     # 184 sample entries — WindowsUpdateClient
│   └── sample_app2.log     # 144 sample entries — SecurityCenterService
├── tests/
│   └── test_core.py        # 5 pytest cases
├── DESIGN.md               # Architecture and design decisions
├── requirements.txt
└── conftest.py             # Adds project root to sys.path for pytest

Setup

1. Create and activate a virtual environment

python -m venv venv
source venv/bin/activate        # Windows: venv\Scripts\activate

2. Install dependencies

pip install -r requirements.txt

3. Elasticsearch (optional)

The application works without Elasticsearch — it falls back to SQLite LIKE search automatically. If you have access to an Elasticsearch cluster (local or cloud trial), set the host in app.py:

indexer = LogIndexer(es_host="http://localhost:9200")
agent   = LogSearchAgent(es_host="http://localhost:9200")

If Elasticsearch is not reachable the application prints:

[LogIndexer] Elasticsearch unreachable — using SQLite only.

No other changes are needed.

Running the Application

python app.py

The Flask development server starts on http://localhost:5000.

Ingest sample logs

curl -X POST http://localhost:5000/ingest

Or ingest specific files:

curl -X POST http://localhost:5000/ingest \
     -H "Content-Type: application/json" \
     -d '{"filenames": ["sample_app1.log"]}'

Search indexed logs

curl -X POST http://localhost:5000/search \
     -H "Content-Type: application/json" \
     -d '{"query": "error", "max_results": 20}'

Example response:

{
  "count": 8,
  "backend": "sqlite",
  "elapsed_ms": 1.42,
  "results": [
    {
      "id": 3,
      "source_file": "sample_app1.log",
      "module": "WindowsUpdateClient",
      "level": "ERROR",
      "message": "Failed to reach update server: timeout after 30s",
      "timestamp": "2026-02-14 10:00:01",
      "ingested_at": "2026-02-14 08:14:30"
    }
  ]
}

Run the performance benchmark

curl "http://localhost:5000/benchmark?q=error"

Example response:

{
  "query": "error",
  "grep_ms": 0.18,
  "indexed_ms": 0.07,
  "reduction_pct": 61.1
}

Health check

curl http://localhost:5000/health

Running Tests

pytest tests/ -v --cov=core --cov-report=term-missing

Expected output: 5 tests passing with ≥ 80 % coverage on the three core classes.

gRPC Contract

The file proto/log_search.proto defines the agent-to-backend communication contract. It is illustrative — the active interface is the Flask HTTP API. To compile Python stubs from the proto:

python -m grpc_tools.protoc -I proto \
    --python_out=proto --grpc_python_out=proto \
    proto/log_search.proto

See DESIGN.md §5 for details.

Architecture

See DESIGN.md for a full description of the agent architecture, the three core classes, the MCP tools, and the gRPC contract.

Notes

• Elasticsearch integration is fully implemented but optional. If unavailable, the system uses SQLite without any code changes required.

• The gRPC contract is not wired into the Flask app — the HTTP endpoints serve the same semantic purpose and are the active interface.

• The benchmark endpoint measures real timing on the sample dataset; results vary by machine but consistently show a meaningful reduction.