MCP tools consume context window tokens. Registering 50 MCP tools in Claude Code means 50 tool descriptions competing for context space. The fix: on-demand loading, tool trimming, selective registration, and smart defaults. Five strategies ranked for keeping MCP context lean.
Top Pick
On-demand tool loading (registering tools only when needed) is the most effective strategy. Scavio MCP's 11 focused tools are already trimmed — no bloat from unused endpoints.
Full Ranking
#1
On-demand tool loading
Eliminating unused tool descriptions from context
Pros
- Only loads tools when agent needs them
- Dramatically reduces context token usage
- Works with any MCP server
- Agent decides which tools to load
Cons
- Requires agent logic to determine which tools to load
- Not all MCP clients support dynamic registration
#2
Tool trimming (fewer tools per server)
Reducing per-server context overhead
Pros
- Each MCP server exposes only essential tools
- Scavio MCP: 11 tools (not 50+)
- Clear tool naming reduces LLM confusion
- Faster tool selection by the agent
Cons
- May miss edge-case tools
- Requires knowing which tools are essential
#3Our Pick
Scavio MCP (example of lean MCP)
Pre-trimmed search MCP with 11 focused tools
Pros
- 11 tools covering 5 platforms
- Clear tool names (google_search, youtube_search, etc.)
- Hosted — zero local resource overhead
- No duplicate or overlapping tools
Cons
- Fixed tool surface (cannot customize)
- 11 tools still consume some context
#4
Selective registration per task
Task-specific MCP tool subsets
Pros
- Register only the MCPs needed for current task
- Different MCP configs for different workflows
- Minimal context per task type
Cons
- Requires maintaining multiple configs
- Manual switching between task profiles
#5
MCP server consolidation
Reducing total MCP server count
Pros
- Fewer servers = fewer tool descriptions
- Single server for related tools
- Simpler configuration
Cons
- Monolithic servers are harder to maintain
- All-or-nothing tool loading
Side-by-Side Comparison
| Criteria | Scavio | Runner-up | 3rd Place |
|---|---|---|---|
| Context savings | Moderate (11 tools) | High (on-demand) | High (selective registration) |
| Implementation effort | Zero (hosted) | High (custom agent logic) | Medium (config management) |
| Flexibility | Fixed 11 tools | Maximum (dynamic) | High (per-task profiles) |
| Client compatibility | All MCP clients | Limited (needs dynamic registration) | All clients |
Why Scavio Wins
- On-demand tool loading is the most impactful optimization but requires agent-level logic that not all MCP clients support. It is the best strategy when your client supports it.
- Selective registration per task is simpler than dynamic loading: maintain 3-4 MCP config files and switch based on workflow. No custom code needed, just config management.
- Scavio MCP's value in context optimization is its design: 11 tools with clear names covering 5 platforms. Compare to a hypothetical MCP with 50 tools — the context overhead difference is significant.
- The biggest context optimization is often removing MCP servers you rarely use. Audit your MCP config: if a tool has not been called in the last week, consider removing it.