Local File Search

LangChain CLI agent that combines an in-process Local File Search MCP (FastMCP) with the remote Microsoft Learn MCP. The LLM uses MiniMax via the OpenAI-compatible API.

Features

• search_files — metadata filters (name, folder, extension, dates, size)
• search_pdf_content — PDF full-text keyword search via pypdf
• Microsoft Learn MCP at https://learn.microsoft.com/api/mcp (streamable_http)
• SKILL-based routing with JSON-only local results and 2000-char MS answers
• Async REPL CLI

Documentation

Guide	Description
docs/README.md	Documentation index
docs/PROJECT_OVERVIEW.md	Architecture and what was built
docs/LLM_PROVIDER_GUIDE.md	MiniMax ↔ OpenAI migration
docs/DEPLOYMENT.md	Deploy: local, GitHub, Docker, systemd
docs/OPERATIONS.md	Operations and CI
docs/TROUBLESHOOTING.md	Common issues
docs/COMPLIANCE_REPORT.md	Assignment audit
docs/INSTRUCTIONS_FOR_ABIN.md	Reviewer guide for install.py

Setup

One command (recommended):

git clone https://github.com/dchatpar/mcp-file-agent.git
cd mcp-file-agent
chmod +x install.py
./install.py --non-interactive --skip-e2e   # no API key; full gate without E2E
# Or interactive: ./install.py

Manual setup:

cd mcp-file-agent
python -m venv .venv
source .venv/bin/activate
pip install -e ".[dev]"
cp .env.example .env
# Set OPENAI_API_KEY in .env (never commit .env)
python scripts/generate_samples.py

MiniMax (OpenAI-compatible)

Configure .env:

OPENAI_API_KEY=<your MiniMax API key>
OPENAI_BASE_URL=https://api.minimax.io/v1
OPENAI_MODEL=MiniMax-M2.7

LangChain uses ChatOpenAI with base_url pointing at MiniMax. MiniMax-only extra_body (thinking disabled) is applied automatically when the base URL contains minimax. OPENAI_API_BASE_URL is accepted as an alias for OPENAI_BASE_URL.

Assignment / OpenAI GPT-5.x: Defaults to MiniMax-M2.7. For OpenAI, copy .env.openai.example to .env or set OPENAI_BASE_URL=https://api.openai.com/v1, your GPT model id, and an OpenAI API key. Full steps: docs/LLM_PROVIDER_GUIDE.md.

Environment

Variable	Default	Description
OPENAI_API_KEY	—	Required for agent E2E (MiniMax key)
OPENAI_BASE_URL	https://api.minimax.io/v1	MiniMax OpenAI-compatible endpoint
OPENAI_MODEL	MiniMax-M2.7	Model name on MiniMax
SEARCH_ROOT	data/samples/zoology	Sandboxed search directory
FILE_SEARCH_ROOT	(same as SEARCH_ROOT)	Alias for SEARCH_ROOT
MICROSOFT_LEARN_MCP_URL	https://learn.microsoft.com/api/mcp	Learn MCP endpoint
MS_ANSWER_MAX_CHARS	2000	Max length for Microsoft Learn answers

Run CLI

file-search-agent
# or
python -m file_search_agent.main

Sample queries

• Local (JSON only): What PDF files are available in our system?
• Learn (≤2000 chars): What is Azure Blob Storage?
• PDF content search: Find mentions of migration in the PDFs
• Out-of-scope: What is the capital of France? → refusal JSON

Test data

The data/samples/zoology/ directory holds 8 non-technical zoology files used for all local-search tests:

File	Extension	Description
african_elephant_study.pdf	.pdf	Elephant population dynamics
marine_mammals_report.pdf	.pdf	Orca/dolphin hydrophone survey
bird_migration_analysis.pdf	.pdf	Arctic tern geolocator study
amphibian_survey_2023.pdf	.pdf	Chytrid fungus impact assessment
coral_reef_observations.docx	.docx	Great Barrier Reef transect notes
species_count_2024.xls	.xls	Endangered species population counts
field_notes_borneo.txt	.txt	Borneo rainforest expedition diary
jaguar_photo_rainforest.jpg	.jpg	Camera-trap image placeholder

Regenerate with: python scripts/generate_samples.py

Verification

QA matrix

Check	Command	API key	Expected
Lint	ruff check src tests scripts install.py	No	All checks passed
Unit tests	pytest -v	No	40 passed
E2E agent	python -u scripts/e2e_verify.py	Yes	5/5 PASSED (~1–2 min)
Production gate	python -u scripts/production_gate.py	Yes	All 6 steps PASS (~90s)
Sample data	python scripts/generate_samples.py	No	8 files in data/samples/zoology/

Run lint and unit tests in parallel:

source .venv/bin/activate
pip install -e ".[dev]"
python scripts/generate_samples.py
ruff check src tests scripts & pytest -v & wait

E2E (requires OPENAI_API_KEY in .env):

Takes about 1–2 minutes. Use unbuffered output so progress prints appear immediately ([1/5] … [5/5]):

python -u scripts/e2e_verify.py

Checks:

1. PDF files query → local tools, JSON with PDF entries
2. List all files → local tools, 8 files total
3. Elephant search → local tools, elephant match in JSON
4. Azure Blob Storage → Learn MCP only, answer ≤ 2000 chars
5. Out-of-scope (capital of France) → assignment error JSON, no tools

Interactive CLI smoke test:

file-search-agent

Assignment compliance

Requirement	Implementation	Verified by
Local File Search MCP (in-process)	mcp/local_file_search.py via FastMCP	test_local_mcp.py, E2E [1–3]
search_files metadata filters	name, folder, extension, dates, size	test_search_files_*
search_pdf_content full-text	pypdf keyword search	test_search_pdf_content_keyword
list_all_files	lists all sandboxed files	test_list_all_files_returns_eight, E2E [2]
read_pdf_content	read single PDF by path	test_read_pdf_content_*
Microsoft Learn MCP (remote)	streamable_http at learn.microsoft.com	test_learn_mcp.py, E2E [4]
SKILL routing (local JSON / MS prose / out-of-scope)	SKILL.md, routing.py, output_guard.py	test_agent_routing.py, E2E [5]
MiniMax via OpenAI-compatible API	ChatOpenAI + conditional extra_body	agent_factory.py, test_agent_factory.py, E2E all
Sandboxed SEARCH_ROOT	path traversal rejected	test_security.py
8 sample zoology files	data/samples/zoology/	generate_samples.py, E2E [2]

Dependencies

Pinned full environment (after pip install -e ".[dev]"):

pip install -r requirements.txt
pip install -e .

Or install from project metadata only: pip install -e ".[dev]".

GitHub

Published repository: https://github.com/dchatpar/mcp-file-agent

Reviewer abin-aot has been invited as a collaborator. Submission email draft for the AOT assessment: docs/SUBMISSION_EMAIL_TO_ABIN.md.

Project layout

src/file_search_agent/
  main.py              # Async REPL
  config.py            # Env config
  models.py            # Pydantic tool models
  agent_factory.py     # create_agent + MCP clients
  output_guard.py      # JSON / truncation guards
  mcp/local_file_search.py
data/samples/zoology/  # Non-tech zoology sample files
docs/                  # Full deployment and LLM guides
deploy/                # systemd unit example
Dockerfile             # Container image
docker-compose.yml
tests/

License

MIT