diff --git a/README.md b/README.md
index 9cb4ac4..91bc261 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@ This is my personal **.skills** repository for Codex, Cursor, OpenClaw and agent
 |---|---|---|
 | `technical-deslop` | Ship clean diffs fast: remove AI noise and keep behavior unchanged. | `npx skills add vincentkoc/dotskills --skill technical-deslop -y` |
 | `technical-documentation` | Produce dev‑ready docs: clear, structured build/review for brownfield + evergreen. | `npx skills add vincentkoc/dotskills --skill technical-documentation -y` |
+| `session-done` | Capture atomic `/done` session teardowns with structured decisions, follow-ups, reflection, and PKM handoff. | `npx skills add vincentkoc/dotskills --skill session-done -y` |
 | `technical-integrations` | Design integrations that land: vendor‑agnostic API/RFC/SDK plans with rollout safety. | `npx skills add vincentkoc/dotskills --skill technical-integrations -y` |
 | `technical-skill-finder` | Turn real agent pain into new skills: mine logs, rank wins, draft next steps. | `npx skills add vincentkoc/dotskills --skill technical-skill-finder -y` |
 
@@ -45,6 +46,7 @@ Install one skill:
 ```bash
 npx skills add vincentkoc/dotskills --skill technical-deslop -y
 npx skills add vincentkoc/dotskills --skill technical-documentation -y
+npx skills add vincentkoc/dotskills --skill session-done -y
 npx skills add vincentkoc/dotskills --skill technical-integrations -y
 npx skills add vincentkoc/dotskills --skill technical-skill-finder -y
 ```
diff --git a/catalog.yaml b/catalog.yaml
index 8cbc332..c784d44 100644
--- a/catalog.yaml
+++ b/catalog.yaml
@@ -41,6 +41,13 @@ skills:
     tags: [docs, writing, review, evergreen, brownfield]
     version: 0.1.0
 
+  - id: session-done
+    name: Session Done
+    path: skills/session-done
+    source: local
+    tags: [handoff, teardown, memory, workflow]
+    version: 0.1.0
+
   - id: technical-integrations
     name: Technical Integrations
     path: skills/technical-integrations
diff --git a/private-skills/session-done/SKILL.md b/private-skills/session-done/SKILL.md
new file mode 100644
index 0000000..d62a844
--- /dev/null
+++ b/private-skills/session-done/SKILL.md
@@ -0,0 +1,59 @@
+---
+name: session-done
+description: Run a post-session teardown with `/done` to capture what was discussed, key decisions, questions, follow-ups, and outcomes into a session markdown artifact.
+license: Proprietary
+metadata:
+  internal: true
+  version: "0.1.0"
+---
+
+# Session Done
+
+## Purpose
+
+Capture and persist every finished agent session as a compact, atomic knowledge unit so work can be resumed quickly, reflected on, and indexed in your knowledge base.
+
+## When to use
+
+- You finish a chat/session and want a structured teardown before switching context.
+- You need a canonical `.md` handoff containing session ID, branch, decisions, blockers, and follow-up state.
+- You want to feed outcomes into Obsidian/PKM and optional flashcard extraction.
+
+## Workflow
+
+1. Trigger with `/done` at the end of a session.
+2. Run `scripts/session-done` with collected session notes:
+   - `--session-id` (optional, defaults to `CLAUDE_SESSION_ID` or timestamp)
+   - `--branch` (optional, defaults to current `git` branch)
+   - `--summary`, `--decisions`, `--questions`, `--follow-ups`, `--state`, `--reflection`, `--flashcards`
+3. Confirm output path (default: `./.session-notes` under repo root, or `DONE_NOTES_DIR` override).
+4. If `DONE_OBSIDIAN_VAULT` is set, the script copies the file into that directory for Obsidian/PKM ingestion.
+5. If a shared memory file exists, append the reflection block to `done-shared-memory.md`.
+6. End session with one action item and one risk item included in the `## Next actions` section.
+
+## Inputs
+
+- `--summary`: high-level recap of what the agent worked on.
+- `--decisions`: finalized choices and rationale.
+- `--questions`: unresolved or open questions from the session.
+- `--follow-ups`: concrete follow-up tasks or blockers.
+- `--state`: current state of work and repository status.
+- `--reflection`: explicit self-reflection on what to improve.
+- `--flashcards`: optional question/answer bullets for spaced repetition.
+- Optional env vars:
+  - `DONE_NOTES_DIR`: target folder for generated `.md`.
+  - `DONE_OBSIDIAN_VAULT`: optional Obsidian/PKM target folder.
+  - `DONE_MEMORY_FILE`: optional shared memory file (default: `done-shared-memory.md` in notes dir).
+
+## Outputs
+
+- A Markdown teardown file with:
+  - filename containing `session` + session id + branch + timestamp.
+  - sectioned recap, decisions, questions, follow-ups, reflection, and flashcards.
+  - machine-readable metadata block for future re-ingestion.
+- Optional copied/added artifact in your Obsidian/PKM folder.
+- Optional updated shared-memory file.
+
+## Notes
+
+The script is intentionally minimal and deterministic. Keep the `/done` payload concise and complete, because this artifact is designed to be the source of truth for the next session spin-up.
diff --git a/private-skills/session-done/scripts/session-done b/private-skills/session-done/scripts/session-done
new file mode 100755
index 0000000..8540843
--- /dev/null
+++ b/private-skills/session-done/scripts/session-done
@@ -0,0 +1,191 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+usage() {
+  cat <<'EOF'
+Usage: session-done [options]
+
+Required: at least one content section.
+
+Options:
+  --session-id VALUE      Session identifier (defaults to CLAUDE_SESSION_ID or timestamp)
+  --branch VALUE          Git branch name (defaults to current branch or unknown)
+  --summary VALUE         Session summary
+  --decisions VALUE       Key decisions
+  --questions VALUE       Open questions
+  --follow-ups VALUE      Follow-up actions
+  --state VALUE           Current state snapshot
+  --reflection VALUE      Self-reflection notes
+  --flashcards VALUE      Flashcards in "Q: ... | A: ..." per line
+  --notes-dir VALUE       Directory for output notes (default: ./.session-notes)
+  --obsidian-dir VALUE    Additional copy target (e.g. Obsidian vault notes folder)
+  --memory-file VALUE      Shared memory file inside notes dir (default: done-shared-memory.md)
+  --help                  Show this help
+
+Environment variables:
+  DONE_NOTES_DIR          Default notes dir
+  DONE_OBSIDIAN_VAULT     Optional Obsidian/PKM notes folder
+  DONE_MEMORY_FILE         Default shared memory filename
+EOF
+}
+
+notes_dir="${DONE_NOTES_DIR:-.session-notes}"
+obsidian_dir="${DONE_OBSIDIAN_VAULT:-}"
+memory_file="${DONE_MEMORY_FILE:-done-shared-memory.md}"
+session_id="${CLAUDE_SESSION_ID:-$(date +%s)}"
+branch="$(git branch --show-current 2>/dev/null || true)"
+summary=""
+decisions=""
+questions=""
+follow_ups=""
+state=""
+reflection=""
+flashcards=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --session-id)
+      session_id="${2:?missing --session-id value}"
+      shift 2
+      ;;
+    --branch)
+      branch="${2:?missing --branch value}"
+      shift 2
+      ;;
+    --summary)
+      summary="${2:?missing --summary value}"
+      shift 2
+      ;;
+    --decisions)
+      decisions="${2:?missing --decisions value}"
+      shift 2
+      ;;
+    --questions)
+      questions="${2:?missing --questions value}"
+      shift 2
+      ;;
+    --follow-ups)
+      follow_ups="${2:?missing --follow-ups value}"
+      shift 2
+      ;;
+    --state)
+      state="${2:?missing --state value}"
+      shift 2
+      ;;
+    --reflection)
+      reflection="${2:?missing --reflection value}"
+      shift 2
+      ;;
+    --flashcards)
+      flashcards="${2:?missing --flashcards value}"
+      shift 2
+      ;;
+    --notes-dir)
+      notes_dir="${2:?missing --notes-dir value}"
+      shift 2
+      ;;
+    --obsidian-dir)
+      obsidian_dir="${2:?missing --obsidian-dir value}"
+      shift 2
+      ;;
+    --memory-file)
+      memory_file="${2:?missing --memory-file value}"
+      shift 2
+      ;;
+    --help|-h)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown argument: $1" >&2
+      usage
+      exit 2
+      ;;
+  esac
+done
+
+if [[ -z "${summary}" && -z "${decisions}" && -z "${questions}" && -z "${follow_ups}" && -z "${state}" && -z "${reflection}" && -z "${flashcards}" ]]; then
+  echo "No content provided. Add at least one of --summary/--decisions/--questions/--follow-ups/--state/--reflection/--flashcards." >&2
+  exit 2
+fi
+
+if [[ -z "${branch}" ]]; then
+  branch="unknown"
+fi
+
+timestamp="$(date -u +%Y-%m-%dT%H-%M-%SZ)"
+safe_session_id="$(echo "${session_id}" | tr -cd '[:alnum:]._-' | head -c 48)"
+if [[ -z "${safe_session_id}" ]]; then
+  safe_session_id="session"
+fi
+safe_branch="$(echo "${branch}" | tr -cd '[:alnum:]._-' | head -c 64)"
+if [[ -z "${safe_branch}" ]]; then
+  safe_branch="branch"
+fi
+safe_ts="${timestamp//:/-}"
+
+mkdir -p "${notes_dir}"
+note_file="${notes_dir}/session-${safe_branch}-${safe_session_id}-${safe_ts}.md"
+
+cat > "${note_file}" <<EOF
+# Session teardown
+
+## Metadata
+
+- session_id: ${session_id}
+- branch: ${branch}
+- timestamp_utc: ${timestamp}
+- generator: session-done skill script
+
+## Summary
+
+${summary}
+
+## Decisions
+
+${decisions}
+
+## Open Questions
+
+${questions}
+
+## Follow-ups
+
+${follow_ups}
+
+## State
+
+${state}
+
+## Self-reflection
+
+${reflection}
+
+## Flashcards
+
+${flashcards}
+
+EOF
+
+echo "Wrote session teardown: ${note_file}"
+
+if [[ -n "${obsidian_dir}" ]]; then
+  mkdir -p "${obsidian_dir}"
+  cp "${note_file}" "${obsidian_dir}/"
+  echo "Synced to Obsidian/PKM: ${obsidian_dir}"
+fi
+
+if [[ -n "${memory_file}" ]]; then
+  memory_path="${notes_dir}/${memory_file}"
+  {
+    echo ""
+    echo "## Session ${timestamp}"
+    echo "- session_id: ${session_id}"
+    echo "- branch: ${branch}"
+    echo "- summary: ${summary}"
+    echo "- follow-ups: ${follow_ups}"
+    echo "- reflection: ${reflection}"
+    echo ""
+  } >> "${memory_path}"
+  echo "Updated shared memory: ${memory_path}"
+fi
diff --git a/skills/session-done/SKILL.md b/skills/session-done/SKILL.md
new file mode 100644
index 0000000..79b6b6e
--- /dev/null
+++ b/skills/session-done/SKILL.md
@@ -0,0 +1,55 @@
+---
+name: session-done
+description: Capture each completed agent session as a structured `/done` teardown with branch/session metadata, key decisions, questions, follow-ups, reflection, and PKM-friendly handoff artifacts.
+license: AGPL-3.0-only
+metadata:
+  source: "https://github.com/vincentkoc/dotskills"
+---
+
+# Session Done
+
+## Purpose
+
+Create an atomic handoff for every finished agent session so context can be resumed without ambiguity and work can be resumed in small, traceable units.
+
+## When to use
+
+- A session has ended and you want a durable teardown before context switch.
+- You need a canonical `.md` record with session id, branch, decisions, questions, and follow-ups.
+- You want optional Obsidian/PKM sync plus shared-memory updates.
+- You want self-reflection plus flashcard-ready prompts captured alongside outcomes.
+
+## Workflow
+
+1. End with `/done` and collect values for at least one section.
+2. Run `scripts/session-done` with section flags:
+   - `--summary`
+   - `--decisions`
+   - `--questions`
+   - `--follow-ups`
+   - `--state`
+   - `--reflection`
+   - `--flashcards`
+3. Use `--session-id` for the current Claude session and `--branch` (defaults to git branch).
+4. Review the generated `.md` file in `DONE_NOTES_DIR` (or `.session-notes`).
+5. If configured, confirm sync to Obsidian/PKM and shared-memory append.
+
+## Inputs
+
+- `--summary`: what was discussed or changed.
+- `--decisions`: final choices and rationale.
+- `--questions`: unresolved questions.
+- `--follow-ups`: pending items.
+- `--state`: work state / status.
+- `--reflection`: what to improve next session.
+- `--flashcards`: optional spaced-repetition prompts.
+- Optional env vars:
+  - `DONE_NOTES_DIR`: output directory (default `./.session-notes`).
+  - `DONE_OBSIDIAN_VAULT`: optional PKM/Obsidian target directory.
+  - `DONE_MEMORY_FILE`: optional shared-memory filename in notes dir.
+
+## Outputs
+
+- One markdown file named with session id + branch + timestamp.
+- Structured sections for summary, decisions, questions, follow-ups, state, reflection, and flashcards.
+- Optional Obsidian/PKM copy and optional shared-memory append.
diff --git a/skills/session-done/agents/openai.yaml b/skills/session-done/agents/openai.yaml
new file mode 100644
index 0000000..a46831e
--- /dev/null
+++ b/skills/session-done/agents/openai.yaml
@@ -0,0 +1,10 @@
+interface:
+  display_name: "Session Done"
+  short_description: "Capture atomic post-session teardown notes with session metadata and structured handoff outputs."
+  icon_small: "./assets/icon.jpg"
+  icon_large: "./assets/icon.jpg"
+  brand_color: "#111827"
+  default_prompt: "Capture session teardown in structured markdown for continuation, shared memory, and PKM workflows."
+
+policy:
+  allow_implicit_invocation: true
diff --git a/skills/session-done/assets/icon.jpg b/skills/session-done/assets/icon.jpg
new file mode 100644
index 0000000..8c8b22a
Binary files /dev/null and b/skills/session-done/assets/icon.jpg differ
diff --git a/skills/session-done/scripts/session-done b/skills/session-done/scripts/session-done
new file mode 100755
index 0000000..8540843
--- /dev/null
+++ b/skills/session-done/scripts/session-done
@@ -0,0 +1,191 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+usage() {
+  cat <<'EOF'
+Usage: session-done [options]
+
+Required: at least one content section.
+
+Options:
+  --session-id VALUE      Session identifier (defaults to CLAUDE_SESSION_ID or timestamp)
+  --branch VALUE          Git branch name (defaults to current branch or unknown)
+  --summary VALUE         Session summary
+  --decisions VALUE       Key decisions
+  --questions VALUE       Open questions
+  --follow-ups VALUE      Follow-up actions
+  --state VALUE           Current state snapshot
+  --reflection VALUE      Self-reflection notes
+  --flashcards VALUE      Flashcards in "Q: ... | A: ..." per line
+  --notes-dir VALUE       Directory for output notes (default: ./.session-notes)
+  --obsidian-dir VALUE    Additional copy target (e.g. Obsidian vault notes folder)
+  --memory-file VALUE      Shared memory file inside notes dir (default: done-shared-memory.md)
+  --help                  Show this help
+
+Environment variables:
+  DONE_NOTES_DIR          Default notes dir
+  DONE_OBSIDIAN_VAULT     Optional Obsidian/PKM notes folder
+  DONE_MEMORY_FILE         Default shared memory filename
+EOF
+}
+
+notes_dir="${DONE_NOTES_DIR:-.session-notes}"
+obsidian_dir="${DONE_OBSIDIAN_VAULT:-}"
+memory_file="${DONE_MEMORY_FILE:-done-shared-memory.md}"
+session_id="${CLAUDE_SESSION_ID:-$(date +%s)}"
+branch="$(git branch --show-current 2>/dev/null || true)"
+summary=""
+decisions=""
+questions=""
+follow_ups=""
+state=""
+reflection=""
+flashcards=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --session-id)
+      session_id="${2:?missing --session-id value}"
+      shift 2
+      ;;
+    --branch)
+      branch="${2:?missing --branch value}"
+      shift 2
+      ;;
+    --summary)
+      summary="${2:?missing --summary value}"
+      shift 2
+      ;;
+    --decisions)
+      decisions="${2:?missing --decisions value}"
+      shift 2
+      ;;
+    --questions)
+      questions="${2:?missing --questions value}"
+      shift 2
+      ;;
+    --follow-ups)
+      follow_ups="${2:?missing --follow-ups value}"
+      shift 2
+      ;;
+    --state)
+      state="${2:?missing --state value}"
+      shift 2
+      ;;
+    --reflection)
+      reflection="${2:?missing --reflection value}"
+      shift 2
+      ;;
+    --flashcards)
+      flashcards="${2:?missing --flashcards value}"
+      shift 2
+      ;;
+    --notes-dir)
+      notes_dir="${2:?missing --notes-dir value}"
+      shift 2
+      ;;
+    --obsidian-dir)
+      obsidian_dir="${2:?missing --obsidian-dir value}"
+      shift 2
+      ;;
+    --memory-file)
+      memory_file="${2:?missing --memory-file value}"
+      shift 2
+      ;;
+    --help|-h)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown argument: $1" >&2
+      usage
+      exit 2
+      ;;
+  esac
+done
+
+if [[ -z "${summary}" && -z "${decisions}" && -z "${questions}" && -z "${follow_ups}" && -z "${state}" && -z "${reflection}" && -z "${flashcards}" ]]; then
+  echo "No content provided. Add at least one of --summary/--decisions/--questions/--follow-ups/--state/--reflection/--flashcards." >&2
+  exit 2
+fi
+
+if [[ -z "${branch}" ]]; then
+  branch="unknown"
+fi
+
+timestamp="$(date -u +%Y-%m-%dT%H-%M-%SZ)"
+safe_session_id="$(echo "${session_id}" | tr -cd '[:alnum:]._-' | head -c 48)"
+if [[ -z "${safe_session_id}" ]]; then
+  safe_session_id="session"
+fi
+safe_branch="$(echo "${branch}" | tr -cd '[:alnum:]._-' | head -c 64)"
+if [[ -z "${safe_branch}" ]]; then
+  safe_branch="branch"
+fi
+safe_ts="${timestamp//:/-}"
+
+mkdir -p "${notes_dir}"
+note_file="${notes_dir}/session-${safe_branch}-${safe_session_id}-${safe_ts}.md"
+
+cat > "${note_file}" <<EOF
+# Session teardown
+
+## Metadata
+
+- session_id: ${session_id}
+- branch: ${branch}
+- timestamp_utc: ${timestamp}
+- generator: session-done skill script
+
+## Summary
+
+${summary}
+
+## Decisions
+
+${decisions}
+
+## Open Questions
+
+${questions}
+
+## Follow-ups
+
+${follow_ups}
+
+## State
+
+${state}
+
+## Self-reflection
+
+${reflection}
+
+## Flashcards
+
+${flashcards}
+
+EOF
+
+echo "Wrote session teardown: ${note_file}"
+
+if [[ -n "${obsidian_dir}" ]]; then
+  mkdir -p "${obsidian_dir}"
+  cp "${note_file}" "${obsidian_dir}/"
+  echo "Synced to Obsidian/PKM: ${obsidian_dir}"
+fi
+
+if [[ -n "${memory_file}" ]]; then
+  memory_path="${notes_dir}/${memory_file}"
+  {
+    echo ""
+    echo "## Session ${timestamp}"
+    echo "- session_id: ${session_id}"
+    echo "- branch: ${branch}"
+    echo "- summary: ${summary}"
+    echo "- follow-ups: ${follow_ups}"
+    echo "- reflection: ${reflection}"
+    echo ""
+  } >> "${memory_path}"
+  echo "Updated shared memory: ${memory_path}"
+fi