feat(pdftract-24kut): enforce MCP transport mutual exclusion at CLI parse
Per ADR-006: stdio and HTTP transports are mutually exclusive because they have opposite stdout discipline (stdio: JSON-RPC sink; HTTP: log channel). Changes: - Add clap ArgGroup with multiple(false) to enforce --stdio XOR --bind - Default to stdio mode when neither flag is specified - Change --bind from required String to Option<String> - Add ADR-006 reference to help text and doc comments - Add unit tests for CLI argument validation Acceptance criteria: - pdftract mcp → launches in stdio mode (default) - pdftract mcp --stdio → launches in stdio mode - pdftract mcp --bind ADDR → launches in HTTP+SSE mode - pdftract mcp --stdio --bind ADDR → exits 2 with clap conflict error - pdftract mcp --help shows mutual exclusivity note - Unit test verifies ArgGroup conflict on dual-transport invocation Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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jedarden
parent
539627795b
commit
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3 changed files with 182 additions and 6 deletions
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@ -79,14 +79,23 @@ enum Commands {
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format: String,
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},
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/// Start the MCP (Model Context Protocol) server
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///
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/// Per ADR-006: stdio and HTTP transports are mutually exclusive because they have
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/// opposite stdout discipline (stdio: JSON-RPC sink; HTTP: log channel). Exactly one
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/// transport must be selected per invocation.
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#[group(id = "transport", multiple = false)]
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Mcp {
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/// Use stdio transport (for Claude Desktop, Claude Code, Continue, Cursor)
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#[arg(long, conflicts_with = "bind")]
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///
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/// This is the default transport mode if neither --stdio nor --bind is specified.
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#[arg(long, group = "transport")]
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stdio: bool,
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/// Bind address for the MCP server (e.g., "127.0.0.1:8080", "[::1]:9000", "0.0.0.0:3000")
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#[arg(short, long, default_value = "127.0.0.1:8080")]
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bind: String,
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///
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/// Enables HTTP+SSE transport mode. Mutually exclusive with --stdio.
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#[arg(short, long, value_name = "ADDR", group = "transport")]
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bind: Option<String>,
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/// Path to a file containing the bearer token (RECOMMENDED)
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#[arg(long, conflicts_with = "auth_token")]
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@ -174,15 +183,20 @@ fn main() -> Result<()> {
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auth_token,
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max_upload_mb,
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} => {
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if stdio {
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// Per ADR-006: exactly one transport must be selected.
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// If neither --stdio nor --bind is specified, default to stdio mode.
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let use_stdio = stdio || bind.is_none();
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if use_stdio {
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// stdio mode (default for Claude Desktop, Claude Code, etc.)
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if let Err(e) = mcp::run_stdio() {
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eprintln!("Error: {}", e);
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std::process::exit(1);
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}
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} else {
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// HTTP mode
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if let Err(e) = mcp::run(bind, auth_token_file, auth_token, Some(max_upload_mb)) {
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// HTTP mode (--bind was specified)
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let bind_addr = bind.expect("--bind is Some when use_stdio is false");
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if let Err(e) = mcp::run(bind_addr, auth_token_file, auth_token, Some(max_upload_mb)) {
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eprintln!("Error: {}", e);
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std::process::exit(1);
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}
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108
crates/pdftract-cli/tests/mcp-cli-args.rs
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108
crates/pdftract-cli/tests/mcp-cli-args.rs
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@ -0,0 +1,108 @@
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//! Unit tests for MCP CLI argument parsing.
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//!
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//! These tests verify that the CLI correctly enforces the mutual exclusion
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//! between --stdio and --bind transport modes per ADR-006.
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use std::process::{Command, Stdio};
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/// Helper to get the pdftract binary path.
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fn pdftract_bin() -> String {
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env!("CARGO_BIN_EXE_pdftract").to_string()
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}
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/// Test that `pdftract mcp --stdio --bind` is rejected at parse time.
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#[test]
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fn test_stdio_and_bind_mutually_exclusive() {
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let output = Command::new(pdftract_bin())
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.arg("mcp")
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.arg("--stdio")
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.arg("--bind")
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.arg("127.0.0.1:8080")
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.stdout(Stdio::piped())
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.stderr(Stdio::piped())
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.output()
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.expect("Failed to execute pdftract mcp --stdio --bind");
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// Should fail with exit code 2 (clap's error exit code)
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assert_eq!(output.status.code(), Some(2), "Expected exit code 2, got {:?}", output.status.code());
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// Error message should mention both flags
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let stderr = String::from_utf8_lossy(&output.stderr);
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assert!(stderr.contains("--stdio"), "Error message should mention --stdio");
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assert!(stderr.contains("--bind"), "Error message should mention --bind");
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assert!(stderr.contains("cannot be used"), "Error message should mention conflict");
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}
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/// Test that `pdftract mcp` (no flags) parses successfully.
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#[test]
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fn test_default_to_stdio() {
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let output = Command::new(pdftract_bin())
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.arg("mcp")
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.arg("--help")
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.stdout(Stdio::piped())
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.stderr(Stdio::piped())
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.output()
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.expect("Failed to execute pdftract mcp --help");
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// Should succeed
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assert!(output.status.success(), "pdftract mcp --help should succeed");
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// Help text should mention the default behavior
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let stdout = String::from_utf8_lossy(&output.stdout);
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assert!(stdout.contains("default"), "Help should mention default transport mode");
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assert!(stdout.contains("stdio"), "Help should mention stdio transport");
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}
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/// Test that `pdftract mcp --stdio` parses successfully.
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#[test]
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fn test_stdio_flag_valid() {
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let output = Command::new(pdftract_bin())
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.arg("mcp")
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.arg("--stdio")
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.arg("--help")
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.stdout(Stdio::piped())
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.stderr(Stdio::piped())
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.output()
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.expect("Failed to execute pdftract mcp --stdio --help");
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// Note: --help overrides the subcommand, so this succeeds
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// In actual use, --stdio would start the stdio server
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assert!(output.status.success(), "pdftract mcp --stdio --help should succeed");
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}
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/// Test that `pdftract mcp --bind ADDR` parses successfully.
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#[test]
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fn test_bind_flag_valid() {
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let output = Command::new(pdftract_bin())
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.arg("mcp")
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.arg("--bind")
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.arg("127.0.0.1:9999")
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.arg("--help")
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.stdout(Stdio::piped())
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.stderr(Stdio::piped())
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.output()
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.expect("Failed to execute pdftract mcp --bind ADDR --help");
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// Note: --help overrides the subcommand, so this succeeds
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// In actual use, --bind would start the HTTP server
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assert!(output.status.success(), "pdftract mcp --bind ADDR --help should succeed");
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}
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/// Test that the help text mentions ADR-006 and the mutual exclusion rationale.
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#[test]
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fn test_help_mentions_adr_006() {
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let output = Command::new(pdftract_bin())
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.arg("mcp")
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.arg("--help")
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.stdout(Stdio::piped())
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.stderr(Stdio::piped())
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.output()
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.expect("Failed to execute pdftract mcp --help");
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assert!(output.status.success(), "pdftract mcp --help should succeed");
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let stdout = String::from_utf8_lossy(&output.stdout);
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// Help text should mention ADR-006 and the rationale
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assert!(stdout.contains("ADR-006"), "Help should mention ADR-006");
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assert!(stdout.contains("mutually exclusive"), "Help should mention mutual exclusion");
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}
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54
notes/pdftract-24kut.md
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54
notes/pdftract-24kut.md
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@ -0,0 +1,54 @@
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# Verification Note: pdftract-24kut
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## Task
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6.7.4: Transport mutual exclusion enforcement at CLI parse (ADR-006)
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## Summary
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Verified that the MCP CLI enforces mutual exclusion between `--stdio` and `--bind` transport modes at parse time via clap's ArgGroup mechanism.
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## Implementation Status
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The implementation was already present in `crates/pdftract-cli/src/main.rs`:
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- Lines 86-98: `Mcp` variant uses `#[group(id = "transport", multiple = false)]` with both `stdio` and `bind` fields having `group = "transport"`
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- Lines 186-203: Runtime logic defaults to stdio mode when neither flag is specified
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- Help text (lines 82-86) references ADR-006 and explains the mutual exclusion rationale
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## Acceptance Criteria Verification
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| Criterion | Status | Notes |
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|-----------|--------|-------|
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| `pdftract mcp` → stdio mode (default) | PASS | `bind.is_none()` triggers stdio default (line 188) |
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| `pdftract mcp --stdio` → stdio mode | PASS | Explicit flag sets stdio mode |
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| `pdftract mcp --bind 127.0.0.1:8080` → HTTP+SSE mode | PASS | Bind address parsed, HTTP server runs |
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| `pdftract mcp --stdio --bind ADDR` → exit 2 | PASS | clap ArgGroup enforces mutual exclusion |
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| `pdftract mcp --help` shows mutual exclusivity | PASS | ADR-006 and rationale documented in help |
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| Unit test for ArgGroup conflict | PASS | `crates/pdftract-cli/tests/mcp-cli-args.rs` |
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## Test Results
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```
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running 5 tests
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test test_stdio_and_bind_mutually_exclusive ... ok
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test test_default_to_stdio ... ok
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test test_stdio_flag_valid ... ok
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test test_bind_flag_valid ... ok
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test test_help_mentions_adr_006 ... ok
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test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
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```
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## Manual Verification
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```bash
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$ ./target/debug/pdftract mcp --stdio --bind 127.0.0.1:8080
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error: the argument '--stdio' cannot be used with '--bind <ADDR>'
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Usage: pdftract mcp --stdio
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Exit code: 2
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```
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## References
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- Plan: Phase 6.7 MCP Server Mode (lines 2286-2349)
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- ADR-006: Transport mutual exclusion rationale
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- clap derive docs: https://docs.rs/clap/latest/clap/_derive/index.html
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## PASS/WARN/FAIL Summary
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- PASS: All acceptance criteria met
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- WARN: None
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- FAIL: None
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