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Agent-to-agent communication bridge for multi-agent systems
About
Agent-to-agent communication bridge for multi-agent systems
Security Report
4.2
Use Caution4.2High RiskThis MCP server implements agent-to-agent communication with capability discovery and task delegation. The code uses proper input validation with Zod schemas and follows MCP protocol standards. However, there are notable concerns around unvalidated agent identity acceptance, insufficient authorization checks for inter-agent operations, and a lack of authentication mechanisms for registering agents or delegating tasks. These gaps mean malicious agents could register with spoofed identities or intercept task results without proper authorization checks. Supply chain analysis found 4 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.
4 files analyzed · 13 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-mdfifty50-boop-a2a-bridge": {
"args": [
"-y",
"a2a-bridge-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
a2a-bridge-mcp
MCP server for agent-to-agent communication -- capability discovery, task delegation, and result aggregation across MCP agents.
MCP connects agents to tools, but not to each other. This server adds a standardized agent-to-agent layer within the MCP protocol -- register agents, discover capabilities, delegate tasks, and broadcast work to multiple agents. Inspired by Google's A2A protocol.
Install
npx a2a-bridge-mcp
Claude Desktop
Add to claude_desktop_config.json:
{
"mcpServers": {
"a2a-bridge": {
"command": "npx",
"args": ["a2a-bridge-mcp"]
}
}
}
From source
git clone https://github.com/mdfifty50-boop/a2a-bridge-mcp.git
cd a2a-bridge-mcp
npm install
node src/index.js
Tools
register_agent
Register an agent with capabilities for discovery by other agents.
| Param | Type | Default | Description |
|---|---|---|---|
agent_id | string | required | Unique agent identifier |
capabilities | string[] | required | Capability strings (e.g. ["code-review", "summarization"]) |
description | string | "" | Human-readable description |
input_schema | object | {} | JSON schema for accepted input |
output_schema | object | {} | JSON schema for produced output |
endpoint | string | "" | Optional endpoint or transport hint |
discover_agents
Find agents matching a capability need with fuzzy text similarity scoring.
| Param | Type | Default | Description |
|---|---|---|---|
capability_needed | string | required | Capability to search for |
min_score | number | 0.3 | Minimum similarity score (0-1) |
Returns scored matches sorted by relevance.
delegate_task
Delegate a task to a specific registered agent. Creates a tracked task with status lifecycle.
| Param | Type | Default | Description |
|---|---|---|---|
from_agent | string | required | Delegating agent ID |
to_agent | string | required | Target agent ID |
task_description | string | required | What the target should do |
input_data | object | {} | Input data for the task |
timeout_ms | number | 30000 | Timeout in milliseconds |
Returns a task_id for tracking.
get_task_result
Get status and result of a delegated task. Also used by executing agents to submit results.
| Param | Type | Description |
|---|---|---|
task_id | string | Task ID from delegate_task or broadcast_task |
submit_result | object | (Optional) Submit completion result |
submit_error | string | (Optional) Submit failure error |
Status lifecycle: pending -> running -> completed / failed.
broadcast_task
Send a task to ALL agents matching a capability. Creates individual tracked tasks for each match.
| Param | Type | Default | Description |
|---|---|---|---|
from_agent | string | required | Broadcasting agent ID |
capability_needed | string | required | Capability to match |
task_description | string | required | What matched agents should do |
input_data | object | {} | Input data |
min_score | number | 0.3 | Minimum match score |
timeout_ms | number | 30000 | Timeout per agent |
Returns list of task IDs for aggregation via get_task_result.
get_agent_card
Get an agent's full capability card with schemas, stats, and task history.
| Param | Type | Description |
|---|---|---|
agent_id | string | Agent identifier |
Returns capabilities, input/output schemas, success rate, and task counts. Inspired by Google A2A agent cards.
list_agents
List all registered agents, optionally filtered by capability.
| Param | Type | Default | Description |
|---|---|---|---|
filter | string | "" | Capability keyword to filter by (empty = all) |
Resources
| URI | Description |
|---|---|
a2a://agents | All registered agents with capabilities and stats |
Usage Pattern
1. register_agent -- each agent registers at startup
2. discover_agents -- find who can handle a task
3. delegate_task -- send work to a specific agent
OR broadcast_task -- send work to all matching agents
4. get_task_result -- poll for completion or submit results
5. get_agent_card -- inspect an agent's full profile
6. list_agents -- overview of the agent network
Multi-agent workflow example
Agent A (orchestrator):
1. register_agent(agent_id="orchestrator", capabilities=["planning", "coordination"])
2. discover_agents(capability_needed="code review")
-> finds Agent B (score: 0.95)
3. delegate_task(from="orchestrator", to="agent-b", task="Review PR #42")
-> task_id: "task_1234"
4. get_task_result(task_id="task_1234")
-> status: "completed", result: { approved: true, comments: [...] }
Agent B (worker):
1. register_agent(agent_id="agent-b", capabilities=["code-review", "linting"])
2. (receives task via external notification or polling)
3. get_task_result(task_id="task_1234", submit_result={ approved: true })
License
MIT
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