sbroenne/error-transport-context
.squad/skills/error-transport-context/SKILL.md
Preserve service request context across MCP and CLI error envelopes.
$ install --global
skillsauthnpx skillsauth add sbroenne/mcp-server-excel error-transport-contextInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- error-transport-context
- description:
- Preserve service request context across MCP and CLI error envelopes.
- domain:
- error-handling
- confidence:
- high
- source:
- observed
Context
Use this when improving diagnostics in the MCP/CLI/service seam without changing Core or COM behavior.
Patterns
- Put shared diagnostics on
ServiceResponse, not in host-specific wrappers. - Stamp failed responses with the originating
commandandsessionIdat the service boundary so both MCP and CLI inherit the same context. - Mirror new shared fields in
ExcelToolsBaseandCliErrorOutputwhile keeping existing compatibility fields likeerror,errorMessage, andisError. - Prefer additive fields over message rewrites so existing clients keep working.
Examples
src/ExcelMcp.Service/ExcelMcpService.cs: enrich failures inProcessAsync()via a request-context helper.src/ExcelMcp.McpServer/Tools/ExcelToolsBase.cs: includecommandandsessionIdin serialized error JSON.src/ExcelMcp.CLI/Infrastructure/CliErrorOutput.cs: emit the same fields in CLI failure envelopes.
Anti-Patterns
- Do not add MCP-only diagnostics that CLI cannot emit.
- Do not push transport diagnostics down into Core commands just to label routed actions.
- Do not remove existing error fields that current tests or clients already consume.
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