v0.20.0 — read_file tool for ifdef-filtered file content

Overview

Adds read_file, a new MCP tool that returns the complete ifdef-filtered content of a C/C++ source file. Only code that actually compiles for the current build configuration is returned — inactive #ifdef branches are replaced with blank lines (preserving original line numbers).

This bridges a gap in the API: get_source reads one symbol body, search_content returns snippets around matches, but there was no way to read a complete file without leaving the fw-context ecosystem. LLMs were already attempting to call read_file even though it did not exist.

Changes

Features

• read_file tool — read complete C/C++ source files with ifdef-filtered, build-accurate content. Falls back to raw disk content for legacy indexes.

File	Change
src/fw_context_mcp/mcp/handlers/source.py	read_file implementation
src/fw_context_mcp/mcp/server.py	tool registration, instructions update, tool count fix
docs/tools.md	read_file documentation
pyproject.toml	version 0.19.2 → 0.20.0
server.json	version + description tool count
glama.json	version + description tool count
CLAUDE.md	tool count fix
AGENTS.md	tool count fix
README-MCP.md	tool count fix, read_file in Understanding row

Breaking changes

None.