feat(mcp): expose org skills as Den MCP capabilities

[reachjalil]

Goal

Make existing Den org skills available through the Den MCP agent capability surface.

This branch only answers: "Can a skill already stored in Den be found and used through search_capabilities / execute_capability?"

What Changed

Area	Change
Capability search	Adds org skill matches into /mcp/agent search_capabilities.
Capability naming	Skills are exposed as skill:<skillId>.
Capability execution	execute_capability({ name: "skill:<skillId>" }) returns the stored SKILL.md content as skillText.
Access model	Uses existing Skill Hub visibility: creator, org/public sharing, direct Skill Hub grants, and team Skill Hub grants.

Files

File	Purpose
ee/apps/den-api/src/mcp/skill-capabilities.ts	New skill capability source: search + execute.
ee/apps/den-api/src/mcp/agent.ts	Merges skill matches into the existing agent MCP capability surface.

Not Included

Not in this branch	Why
GitHub plugin import	Separate backend import branch.
Plugin skill persistence	Separate backend import branch.
Den Web UI	Separate admin UX branch.
Desktop marketplace behavior	Separate desktop/admin UX branch.

Validation

Command	Result
pnpm --filter @openwork-ee/den-api build	✅ Passed

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Project	Deployment	Actions	Updated (UTC)
openwork-landing	Ready	Preview, Comment, Open in v0	Jul 8, 2026 4:04am

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