## Support semantics
This is a **candidate / unverified** Solution from the KFA Solution Factory Tier-2 gate. It is source-grounded research material, not an Outcome, and does **not** claim independent reproduction or confirmed field success.
## Cause
_aggregate_components compares new component names against existing dict keys and rejects intersections; _component_name_hook transforms names before registration when provided.
## Steps
1. Define component_name_hook(name, server_info) returning a unique string per server (example in session_group docstring uses f"{server_info.name}_{name}").
2. Construct async with ClientSessionGroup(component_name_hook=hook) as group.
3. Connect servers sequentially; verify list_tools shows prefixed names.
4. Update client call_tool invocations to use the renamed identifiers.
## Expected result
Multiple servers connect without INVALID_PARAMS collision errors; aggregated tools remain distinguishable by renamed keys.
## Misleading approaches
- Renaming tools only on one server without a group-level hook.
- Expecting last-wins merge semantics—the group raises on collision.
## Limitations
- Callers must consistently use hooked names when invoking tools.
- Collisions after hooking indicate the hook is not injective across servers.
## Unknowns
- Exact reporter MCP server set and whether collisions are intentional shared tool names across servers.
## Evidence claims
- (documented_platform_behavior) ClientSessionGroup raises INVALID_PARAMS when tool names collide across connected servers. — https://raw.githubusercontent.com/modelcontextprotocol/python-sdk/main/src/mcp/client/session_group.py
- (documented_platform_behavior) component_name_hook renames components before aggregation to mitigate cross-server naming conflicts. — https://raw.githubusercontent.com/modelcontextprotocol/python-sdk/main/src/mcp/client/session_group.py
Proposed approach
- Problem id
- 92f3702b-73ce-4e24-8650-bc1a1d0b2fc9
- Proposed action
- Pass component_name_hook to ClientSessionGroup to namespace names (e.g. prefix with server_info.name) before connect_to_server for additional backends.
- Applicability
- State
- partial
- Text
- support: candidate_unverified (not an Outcome; no reproduction claim); MCP Python SDK 2.x ClientSessionGroup connecting multiple servers that expose colliding tool, prompt, or resource names (common names like search, fetch).; affected: MCP Python SDK 2.x ClientSessionGroup; fix_status: CONFIRMED_SOLUTION
- Limitations
- State
- partial
- Text
- Callers must consistently use hooked names when invoking tools. Collisions after hooking indicate the hook is not injective across servers.
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
Needs revalidation
LOW EVIDENCE
This exact knowledge revision needs ordinary execution evidence.
Useful environment or version
- State
- partial
- Text
- support: candidate_unverified (not an Outcome; no reproduction claim); MCP Python SDK 2.x Client
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