Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/jetwind/mcp-context-forge/a2agit clone --depth 1 https://github.com/jetwind/mcp-context-forgeWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.05100 |
| Opus 5 | $0.00000 | $0.02550 |
| Sonnet 5 | $0.00000 | $0.01020 |
| Haiku 4.5 | $0.00000 | $0.00510 |
Grade B, and why
a2a scanned grade B with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
response = requests.post( "http://localhost:4444/a2a/my-agent/jsonrpc", Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -X POST "http://localhost:4444/a2a" \ This is a copy
100% identical to a2a — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 614 lines — stays where its author put it; the contents beside it link to each section on GitHub.
A2A (Agent-to-Agent) Integration
ContextForge supports A2A (Agent-to-Agent) integration, allowing you to register external AI agents and expose them as MCP tools for seamless integration with other agents and MCP clients.
Overview
A2A integration enables you to:
- Register external AI agents (OpenAI, Anthropic, custom agents)
- Expose agents as MCP tools for universal discovery and access
- Support multiple protocols (JSONRPC, custom formats)
- Manage agent lifecycle through admin UI and APIs
- Monitor performance with comprehensive metrics
- Configure authentication with various auth methods
Quick Start
!!! tip "Base URL"
- Direct installs (uvx, pip, or docker run): http://localhost:4444
- Docker Compose (nginx proxy): http://localhost:8080
1. Enable A2A Features
# In your .env file or environment variables
MCPGATEWAY_A2A_ENABLED=true
MCPGATEWAY_A2A_METRICS_ENABLED=true
2. Register an A2A Agent
Via Admin UI:
- Go to
http://localhost:4444/admin - Click the "A2A Agents" tab
- Fill out the "Add New A2A Agent" form
- Click "Add A2A Agent"
Via REST API:
curl -X POST "http://localhost:4444/a2a" \
-H "Authorization: Bearer $MCPGATEWAY_BEARER_TOKEN" \
-H "Content-Type: application/json" \
-d '{
"name": "hello_world_agent",
"endpoint_url": "http://localhost:9999/",
"agent_type": "jsonrpc",
"description": "External AI agent for hello world functionality",
"passthrough_headers": ["Authorization", "X-Tenant-Id"],
"auth_type": "api_key",
"auth_value": "your-api-key",
"tags": ["ai", "hello-world"]
}'
Optional request fields:
| Field | Description | Example |
|---|---|---|
passthrough_headers |
Header names allowed to pass from the incoming request to this A2A agent. Unset (null) and empty ([]) both block request-header forwarding. TOOL_PRE_INVOKE plugin payloads receive only the non-sensitive subset. |
["Authorization", "X-Tenant-Id"] |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 614 lines · 0 tokens per session scan B 224af632b5f8
a2a is an agent published in the GitHub repository jetwind/mcp-context-forge (0 stars, last pushed 19d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 5,100 tokens. A static security scan graded it B with 2 findings (sends data to an external url, makes network calls). It is 100% identical to a2a, differing in 0 lines, and is treated as a copy.
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