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Routes multi-tool workflows through MCP servers for large datasets and pipelines.
Passed 21 of 22 test cases with the skill, and 4 of 22 without it.
and 18 more in the full report
17 fixed4 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
This benchmark measured an earlier version of the skill.
One of 17 test cases the skill fixed. Same model, same prompt, with and without the skill.
What exact string identifier represents the final synthesis phase in the hub's required TodoWrite checklist?
| Checked | Without skill | With skill |
|---|---|---|
| Outputs mcp-code-execution:synthesize-results | Missed | Passed |
The instructions your model reads when the skill loads.
This skill is an orchestration hub, not a CLI. It activates inside a Claude Code session when one of the trigger keywords below appears, or when invoked explicitly:
Skill(conserve:mcp-code-execution)
The hub then routes to the relevant sub-skill modules
(mcp-subagents, mcp-patterns, mcp-validation) based on
the detected workflow shape. There is no separate install
step or CLI entry point.
code execution, MCP, tool chain, data pipeline, MECWMCP Tool Search (Claude Code 2.1.7+): When MCP tool descriptions exceed 10% of context, tools are automatically deferred and discovered via MCPSearch instead of being loaded upfront. This reduces token overhead by ~85% but means tools must be discovered on-demand. Haiku models do not support tool search. Configure threshold with
ENABLE_TOOL_SEARCH=auto:Nwhere N is the percentage.
Subagent MCP Access Fix (Claude Code 2.1.30+): SDK-provided MCP tools are now properly synced to subagents. Prior to 2.1.30, subagents could not access SDK-provided MCP tools: workflows delegating MCP tool usage to subagents were silently broken. No workarounds needed on 2.1.30+.
Claude.ai MCP Connectors (Claude Code 2.1.46+): Users logged into Claude Code with a claude.ai account may have additional MCP tools auto-loaded from claude.ai/settings/connectors. These
test cases passed, vs 4 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.