Executioner1939 Claude Code Skills MCP Fleet

/oracle:mcp-fleet

Multi-workspace MCP plumbing for Claude Code. Discovers per-workspace credentials in isolated Chrome profiles (so OAuth providers can't collide them), generates a multi-server .mcp.json, and prints how to wire it.

Why this exists

Vendor remote MCP servers and Claude Code's OAuth handling both share a documented limitation: OAuth tokens are keyed by server-name or by URL-origin and collapse across workspaces -- authenticating into the second Slack workspace overwrites the first. Filed bugs: anthropics/claude-code#39952, microsoft/vscode#293533, atlassian/atlassian-mcp-server#23. The official Atlassian workaround is "use separate browser profiles per site".

This skill operationalises that workaround. Every workspace gets its own Chromium --user-data-dir for the OAuth flow, and we extract per-instance API tokens (xoxc/xoxd, lin_api_*, secret_*, github_pat_*, Atlassian API token) so the resulting .mcp.json stores credentials in env rather than relying on Claude Code's collision-prone OAuth keyring.

Inputs

$ARGUMENTS selects the subcommand. Default is list.

What this skill does

Run the steps below in order. State what is happening at each step so the user can interrupt if something looks wrong.

Step 1 -- Resolve the plugin script root

SCRIPT_ROOT=""

if [ -n "${CLAUDE_PLUGIN_ROOT:-}" ] && [ -d "$CLAUDE_PLUGIN_ROOT/scripts/mcp-fleet" ]; then
  SCRIPT_ROOT="$CLAUDE_PLUGIN_ROOT/scripts/mcp-fleet"
fi

if [ -z "$SCRIPT_ROOT" ]; then
  PLUGIN_PATH=$(find "$HOME/.claude/plugins/cache" -maxdepth 3 -type d -path "*/oracle/*" 2>/dev/null | sort -V | tail -1)
  if [ -n "$PLUGIN_PATH" ] && [ -d "$PLUGIN_PATH/scripts/mcp-fleet" ]; then
    SCRIPT_ROOT="$PLUGIN_PATH/scripts/mcp-fleet"
  fi
fi

if [ -z "$SCRIPT_ROOT" ]; then
  echo "Could not resolve oracle plugin script root." >&2
  exit 1
fi

State the resolved path. Confirm Node is on PATH (node --version, require >= 18).

Step 2 -- Dispatch on the subcommand

Parse $ARGUMENTS. Recognised forms:

<service> must be one of: slack, linear, notion, github, atlassian. <label> is a user-chosen identifier used as the MCP server-name suffix (e.g. acme-prod produces slack__acme-prod).

For add, the script will launch a headed Chrome window with an isolated profile dir under ~/.claude/oracle/mcp-fleet/chrome-profiles/<service>/<label>/. The user signs in to the one workspace they want to bind to that label, then either pastes the resulting token at the prompt or, for Slack, lets the script auto-extract the cookie. Tokens land in ~/.claude/oracle/mcp-fleet/workspaces.json (mode 600).

After every add and remove, build-matrix.mjs re-runs automatically and rewrites ~/.claude/oracle/mcp-fleet/mcp-fleet.json.

Step 3 -- Run the requested subcommand and stream output

Run the resolved command. Do not buffer -- the discovery flow is interactive and the user must see prompts in real time.

node "$SCRIPT_ROOT/<resolved-script>" <args>

If the command exits non-zero, surface the stderr message verbatim and stop -- do not retry without user direction.

Step 4 -- After a successful add or build, recommend publish

Tell the user:

Discovery complete. Run /oracle:mcp-fleet publish to see the three ways to wire mcp-fleet.json into Claude Code.

For publish itself, just print the script's output -- it is the wiring instructions.

Per-service notes

Slack. Uses cookie extraction (the d cookie is the xoxd token, and the xoxc token is read from localStorage.localConfig_v2.teams.<TEAM_ID>.token) because Slack restricts MCP-eligible apps to the Marketplace and internal apps. Compatible with slack-mcp-server@1.2.3 (korotovsky). No app registration needed.

Linear. Personal API key per workspace. The Linear UI shows the key value once at creation -- the script cannot re-extract a forgotten key. Compatible with mcp-server-linear@1.6.0 (dvcrn -- note the package is unscoped on npm, not @dvcrn/...), with TOOL_PREFIX auto-set to linear_<label>_ so concurrent workspaces don't collide on tool names.

Notion. Internal integration token per workspace, prefix ntn_ (older secret_ prefix is also accepted). The user must share at least one page or database with the integration after creating it, or the MCP server will see an empty workspace. Compatible with @notionhq/notion-mcp-server@2.2.1.

GitHub. One fine-grained PAT per org, scoped to that org's resource owner. Multiple orgs = multiple tokens = multiple MCP server instances. Recommended scopes: Contents R, Issues RW, Pull requests RW, Metadata R. The matrix uses the official public Docker image ghcr.io/github/github-mcp-server; Docker must be installed and running for these entries to start. To swap to the Go binary install path, edit the github-pat spec in build-matrix.mjs.

Atlassian. API token + email + site URL per Cloud site. Uses mcp-atlassian==0.21.1 (sooperset) via uvx for per-instance auth, sidestepping atlassian/atlassian-mcp-server#23. Requires uv on PATH -- install via curl -LsSf https://astral.sh/uv/install.sh | sh. Note: the npm package named mcp-atlassian is by a different author and is not what we use.

Storage layout

~/.claude/oracle/mcp-fleet/
├── workspaces.json              # source of truth, mode 600
├── mcp-fleet.json               # generated, .mcp.json-compatible
└── chrome-profiles/
    ├── slack/
    │   ├── acme-prod/           # one profile per (service, label)
    │   └── personal/
    ├── linear/
    │   └── acme/
    ...

Failure modes and recovery

If a Chrome profile gets stuck (cookies expired, two-factor changed), delete its directory under chrome-profiles/<service>/<label>/ and re-run /oracle:mcp-fleet add <service> <label> -- a fresh profile will be created.

If workspaces.json becomes corrupt, the store will refuse to load and detect.mjs will print the path. Fix the JSON or delete and re-discover.

If mcp-fleet.json is missing keys after build, the matrix builder emits warnings to stderr -- the most common cause is a partial add that exited mid-flow. Re-run add for that workspace.

Caveats

• Per-service token-extraction is best-effort. Vendors change DOM and flash-modal behaviour without notice. The scripts always fall back to manual paste at a prompt.
• Pinned upstream MCP server versions in build-matrix.mjs are verified at the date noted there; bump deliberately.
• v0 wires every workspace as its own stdio child process under Claude Code. With many workspaces this becomes a footprint cost. v1 will optionally route through a single MetaMCP container -- the experimental scaffold lives at scripts/mcp-fleet/templates/docker-compose.yml.tmpl.

Source: Executioner1939/claude-code-skills — distributed by TomeVault.