fix: build binance-tools - pin rmcp to v0.9.1 due to SSE transport removal

[revantg]

Pull Request

Description

Fix the broken build of the entire swarms-rs workspace by fixing the binance-tools example. The binance-tools package was the blocking dependency that prevented the entire workspace from building.

Root Cause: The binance-tools example uses SseServer from rmcp, which requires the transport-sse-server feature. The upstream rust-sdk removed SSE transport support in commit eb5a7f7 (released in rmcp v0.11.0).

Breaking Commit: modelcontextprotocol/rust-sdk@eb5a7f7

(Since the above commit was pushed on 2nd Dec, I imagine the build for swarms-rs repo has been broken since 25 days)

Solution: Pin the rmcp dependency to version 0.9.1, which is the last version that includes SSE transport support and the transport-sse-server feature.

Impact:

• ✅ binance-tools build fixed
• ✅ swarms-rs workspace build fixed (binance-tools was the blocking package)

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🔧 Maintenance (refactoring, performance improvements, etc.)
• 🧪 Tests (adding or improving tests)
• 🚀 CI/CD (changes to build, CI, or deployment processes)

Related Issues

This fix addresses the build failure that occurred after the rust-sdk removed SSE transport support.

Reference: modelcontextprotocol/rust-sdk#562 (commit eb5a7f7)

Changes Made

• Updated examples/binance-tools/Cargo.toml to pin rmcp to version 0.9.1
• Changed from git dependency (main branch) to fixed version 0.9.1
• Version 0.9.1 is the last version that includes SSE transport support and the transport-sse-server feature
• Impact: Fixes binance-tools build, which unblocks the entire swarms-rs workspace build

Testing

Test Coverage

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• All existing tests pass

Test Details

# Build binance-tools successfully
cargo build --package binance-tools

# Build entire workspace successfully (previously failed)
cargo build --workspace

# Code passes checks
cargo check --package binance-tools

# Linting checks pass
cargo clippy --package binance-tools

Build output:

   Compiling binance-tools v0.1.0 (/Users/revant.gupta/gh-repos/swarms/swarms-rs/examples/binance-tools)
   Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.95s

Performance Impact

• No performance impact
• Performance improvement
• Potential performance regression (please explain)

Breaking Changes

• No breaking changes
• Breaking changes (please describe below)

Migration Guide

N/A

Documentation

• Documentation updated (if needed)
• Examples updated (if needed)
• README updated (if needed)
• Changelog updated

Security

• No security implications
• Security considerations addressed

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Additional Notes

The binance-tools example uses SseServer from rmcp, which requires the transport-sse-server feature. This feature was removed in rmcp v0.11.0 (commit eb5a7f7 in the rust-sdk repository). By pinning to v0.9.1, we restore compatibility with the SSE transport.

Workspace Impact: Since binance-tools was the only package preventing the entire swarms-rs workspace from building, fixing binance-tools unblocks the complete workspace build. This was the primary objective of this fix.

Future consideration: Migrate binance-tools to use the new transport method supported by rmcp ≥0.11.0 (streamable-http) to allow updating to the latest rmcp version.

Reviewer Notes

This is a minimal, focused fix that addresses the immediate build failure by pinning to a compatible version. The change is:

• 1 file modified: examples/binance-tools/Cargo.toml
• 1 line changed (dependency version)
• No functional code changes
• Build, check, and clippy all pass

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license.