Fix docs-mcp cache directory ownership checks

bin/context-kit

@@ -41,6 +41,8 @@ DOCS_PORT="${CONTEXT_KIT_DOCS_PORT:-8776}"
 DOCS_HTTP_URL="${CONTEXT_KIT_DOCS_HTTP_URL:-http://127.0.0.1:${DOCS_PORT}/mcp}"
 DOCS_CONTAINER_NAME="context-kit-docs-mcp"
 DOCS_SOURCES_FILE="${DATA_DIR}/docs-sources.txt"
+DOCS_DATA_DIR="${DATA_DIR}/docs"
+MODELS_DATA_DIR="${DATA_DIR}/models"
 
 WEB_SEARCH_IMAGE="${CONTEXT_KIT_WEB_SEARCH_IMAGE:-context-kit/web-search-mcp:latest}"
 DOCS_IMAGE="${CONTEXT_KIT_DOCS_IMAGE:-context-kit/docs-mcp:latest}"
@@ -98,6 +100,35 @@ write_docs_sources_file() {
   mv "${tmp}" "${DOCS_SOURCES_FILE}"
 }
 
+ensure_writable_dir() {
+  local dir="$1"
+  mkdir -p "${dir}"
+  if [[ ! -w "${dir}" || ! -x "${dir}" ]]; then
+    fail "data directory is not writable by uid $(id -u): ${dir}; fix ownership or set CONTEXT_KIT_DATA_DIR"
+  fi
+}
+
+prepare_data_dirs() {
+  ensure_writable_dir "${DATA_DIR}"
+  ensure_writable_dir "${DOCS_DATA_DIR}"
+  ensure_writable_dir "${MODELS_DATA_DIR}"
+}
+
+check_data_dirs() {
+  local ok=0 dir
+  for dir in "${DATA_DIR}" "${DOCS_DATA_DIR}" "${MODELS_DATA_DIR}"; do
+    if [[ ! -d "${dir}" ]]; then
+      printf 'warn data directory missing: %s (run context-kit start)\n' "${dir}"
+    elif [[ -w "${dir}" && -x "${dir}" ]]; then
+      printf 'pass data directory writable: %s\n' "${dir}"
+    else
+      printf 'fail data directory not writable by uid %s: %s\n' "$(id -u)" "${dir}"
+      ok=1
+    fi
+  done
+  return "${ok}"
+}
+
 warn() {
   printf 'warn: %s\n' "$*" >&2
 }
@@ -204,7 +235,7 @@ cmd_build() {
 
 cmd_start() {
   require_docker
-  mkdir -p "${DATA_DIR}"
+  prepare_data_dirs
   if ! docker image inspect "${WEB_SEARCH_IMAGE}" >/dev/null 2>&1 || ! docker image inspect "${DOCS_IMAGE}" >/dev/null 2>&1; then
     cmd_build
   fi
@@ -254,6 +285,10 @@ cmd_doctor() {
     printf 'fail docker compose unavailable\n'; ok=1
   fi
 
+  if ! check_data_dirs; then
+    ok=1
+  fi
+
   if docker network inspect "${NETWORK}" >/dev/null 2>&1; then
     printf 'pass docker network exists: %s\n' "${NETWORK}"
   else

docs/troubleshooting.md

@@ -40,3 +40,34 @@ section. Keep default sources small, and add profiles only when you need them.
 
 Cloudflare and other large docs sets can take significantly longer than the
 default source profile.
+
+## Docs Tools Say Index Manager Not Initialized
+
+If `docs_query` or `docs_refresh` returns `Index manager not initialized` while
+`/status` still responds, the HTTP wrapper is up but `llms-txt-mcp` failed to
+initialize its embedding model or Chroma database. Check the container logs:
+
+```sh
+docker logs context-kit-docs-mcp
+```
+
+A common cause is Docker creating the bind-mounted cache directories as `root`
+before Context Kit created them as the host user. Look for errors like:
+
+```text
+Permission denied: '/models/models--BAAI--bge-small-en-v1.5'
+unable to open database file
+```
+
+Fix ownership and restart:
+
+```sh
+DATA_DIR="${CONTEXT_KIT_DATA_DIR:-$HOME/.local/share/context-kit}"
+sudo chown -R "$(id -u):$(id -g)" "$DATA_DIR/docs" "$DATA_DIR/models"
+bin/context-kit restart
+```
+
+`bin/context-kit start` now pre-creates these directories and `doctor` reports
+existing directories that are not writable by the current user. If an assistant
+client reports `Session not found` after restarting `docs-mcp`, restart the
+assistant so it opens a fresh Streamable HTTP MCP session.