Claude Code Agent Development
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
Compare two sessions side-by-side using Agent Monitor data — per-model token usage (input/output/cacheread/cachewrite + compaction baselines), pricing engine cost breakdowns, workflow intelligence…
Install Session Compare
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill session-compare -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor session-compare --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/ccam-insights/skills/session-compare .claude/skills/session-compare && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "session-compare" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-insights/skills/session-compare into .claude/skills/session-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-compare", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-insights/skills/session-compareType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill session-compare -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor session-compare --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/ccam-insights/skills/session-compare .agents/skills/session-compare && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "session-compare" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-insights/skills/session-compare into .agents/skills/session-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-compare", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill session-compare -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor session-compare --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/ccam-insights/skills/session-compare .cursor/skills/session-compare && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "session-compare" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-insights/skills/session-compare into .cursor/skills/session-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-compare", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git --path plugins/ccam-insights/skills/session-compare--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill session-compare -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor session-compare --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/ccam-insights/skills/session-compare .gemini/skills/session-compare && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "session-compare" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-insights/skills/session-compare into .gemini/skills/session-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-compare", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor session-compareInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill session-compare -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/ccam-insights/skills/session-compare .github/skills/session-compare && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "session-compare" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-insights/skills/session-compare into .github/skills/session-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-compare", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill session-compare -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor session-compare --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/ccam-insights/skills/session-compare .opencode/skills/session-compare && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "session-compare" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-insights/skills/session-compare into .opencode/skills/session-compare/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "session-compare", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
session-compare- GitHub stars
- 1.1k
- Used in
- 1 other repo
- Token cost
- ~790 tokens
- SKILL.md length
- 321 words
- Files
- 2
- Skills in repo
- 78
- Repo updated
- First seen
- Licence
- MIT
At a glance
Compare two sessions side-by-side using Agent Monitor data — per-model token usage (input/output/cacheread/cachewrite + compaction baselines), pricing engine cost breakdowns, workflow intelligence…
- Works in 4 steps: Identify sessions to compare → Gather detailed data for each session → Build comparison → …
- Tasks that involve Subagents
- SKILL.md covers Input, Procedure and Output Format
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Session Compare is an agent skill from hoangsonww/Claude-Code-Agent-Monitor. Compare two sessions side-by-side using Agent Monitor data — per-model token usage (input/output/cacheread/cachewrite + compaction baselines), pricing engine cost breakdowns, workflow intelligence (complexity scores, tool flow transitions, subagent effectiveness), session metadata (thinkingblocks, turncount, turndurationms, usageextras), and full event timelines with all 10+ event types.
Its SKILL.md is about 790 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
It sits in Agent Workflows, covering Subagents. The repository describes itself as: 🚀 A real-time monitoring dashboard for Claude Code & Codex, built with SQLite3, Node.js, Express, React, Vite, TailwindCSS, & WebSockets. It tracks sessions, agent activity… The licence is MIT.
When your agent uses it
- Tasks that involve Subagents
Example prompts
- “/session-compare”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Identify sessions to compare
- Gather detailed data for each session
- Build comparison
- Analysis
What it can do on your machine
Read from SKILL.md and the folder at commit e0f4a1a. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Session Compare loads about 790 tokens when it runs. Until then it costs about 103 tokens; SKILL.md has 321 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from hoangsonww/Claude-Code-Agent-Monitor at commit e0f4a1a, republished under its MIT licence (© hoangsonww). 321 words, ~790 tokens.
Download SKILL.mdSave it as
.claude/skills/session-compare/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- session-compare
- description
- Compare two sessions side-by-side using Agent Monitor data — per-model token usage (input/output/cache_read/cache_write + compaction baselines), pricing engine cost breakdowns, workflow intelligence (complexity scores, tool flow transitions, subagent effectiveness), session metadata (thinking_blocks, turn_count, turn_duration_ms, usage_extras), and full event timelines with all 10+ event types.
Session Compare
Compare two Claude Code sessions side-by-side using Agent Monitor data.
Input
The user provides: $ARGUMENTS
This may be:
- Two session IDs: "abc123 def456"
- "best vs worst" — compare highest and lowest productivity sessions
- "latest 2" — compare the two most recent sessions
- A session ID + "vs average" — compare one session against the baseline
Procedure
Identify sessions to compare:
- If two IDs given: fetch both from
http://localhost:4820/api/sessions/{id} - If "best vs worst": fetch sessions, score by completion + cost efficiency, pick extremes
- If "latest 2":
GET /api/sessions?limit=2(default sort: most recently updated first) - If "vs average": fetch session + compute averages from last 50 sessions
- If two IDs given: fetch both from
Gather detailed data for each session:
- Session metadata:
GET /api/sessions/{id} - Events:
GET /api/events?session_id={id} - Agents:
GET /api/agents?session_id={id} - Cost:
GET /api/pricing/cost/{id}
- Session metadata:
Build comparison:
Overview Comparison
Metric Session A Session B Difference Status completed error — Model sonnet-4 sonnet-4 same Duration 12m 34s 45m 12s +32m 38s Total Cost $0.0234 $0.1456 +522% Events 45 187 +315% Tools Used 8 12 +4 Error Count 0 7 +7 Agents 2 5 +3 Token Comparison
Token Type Session A Session B Difference Input N N ±N% Output N N ±N% Cache Read N N ±N% Cache Write N N ±N% Efficiency N% N% ±N% Tool Usage Comparison
- Tools unique to Session A
- Tools unique to Session B
- Shared tools with usage count comparison
- Error rate per tool in each session
Timeline Comparison
- Side-by-side event timeline
- Where sessions diverged in approach
- Key decision points that led to different outcomes
Agent Activity Comparison
- Agent counts and types
- Subagent strategy differences
- Agent success rates
Analysis:
- Why one session was more efficient/successful than the other
- Key decisions that made the difference
- Lessons to apply to future sessions
Output Format
Present as a side-by-side comparison report with:
- Executive comparison summary (which session was "better" and why)
- Structured comparison tables with color-coded differences (green = better, red = worse)
- A "Lessons Learned" section with actionable takeaways
- Overall winner declaration with justification
© hoangsonww, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file in plugins/ccam-insights/skills/session-compare of hoangsonww/Claude-Code-Agent-Monitor.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit e0f4a1a
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in hoangsonww/Claude-Code-Agent-Monitor, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Session Compare next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Session Compare this skillhoangsonww/Claude-Code-Agent-Monitor | 1.1k | 1 repos | ~790 | Automated safety check: Pass | MIT | |
| Claude Code Agent Developmentanthropics/claude-plugins-official | 38k | 8 repos | ~2.8k | Automated safety check: Pass | Apache-2.0 | |
| Subagent Driven DevelopmentAsvarox/allkaraoke | 261 | 38 repos | ~1.2k | Automated safety check: Pass | None | |
| Dispatching Parallel Agentsultralisp/ultralisp | 258 | 41 repos | ~1.5k | Automated safety check: Pass | None | |
| Paseo Advisor Second Opiniongetpaseo/paseo | 20k | 1 repos | ~756 | Automated safety check: Pass | Custom licence | |
| Task Observerrebelytics/one-skill-to-rule-them-all | 3.2k | 1 repos | ~12k | Automated safety check: Pass | CC-BY-4.0 |
Similar skills
- Official
Subagent Driven Development
Asvarox/allkaraoke
A skill your agent uses when executing implementation plans with independent tasks in the current session
Dispatching Parallel Agents
ultralisp/ultralisp
A skill your agent uses when facing 2+ independent tasks that can be worked on without shared state or sequential dependencies
Paseo Advisor Second Opinion
getpaseo/paseo
Launches one separate agent through Paseo to give a second opinion on the current task, with a self-contained briefing and no permission to edit files.
Task Observer
rebelytics/one-skill-to-rule-them-all
Monitors task execution for skill improvement opportunities.
O2 Review Loop
openobserve/openobserve
Splits a change into planner, coder and independent reviewer roles: you confirm a spec, a subagent implements it, and a separate reviewer checks each round's local WIP commit.
More from hoangsonww/Claude-Code-Agent-Monitor
All 78 skills in this repoBudget Set
hoangsonww/Claude-Code-Agent-Monitor
Define a spend budget for Claude Code and, optionally, create a cost alert rule that fires when usage crosses the limit, via POST /api/alerts/rules on the Agent Monitor dashboard.
Version Release
hoangsonww/Claude-Code-Agent-Monitor
Choose and apply the correct semantic version bump for this repository.
Cost Breakdown
hoangsonww/Claude-Code-Agent-Monitor
Break down Claude Code costs using the Agent Monitor pricing engine.
File Headers
hoangsonww/Claude-Code-Agent-Monitor
MANDATORY for every coding agent (Claude Code, Codex, or any other) on every change-set — every applicable source file the agent creates or updates MUST start with the project's copyright/authorship…
Hook Diagnostics
hoangsonww/Claude-Code-Agent-Monitor
Diagnose Claude Code hook installation, delivery, and ingestion issues.
Memory Review
hoangsonww/Claude-Code-Agent-Monitor
Review the file-based memory store via the Agent Monitor Config Explorer API: the user and project CLAUDE.md plus per-project auto-memory files under ~/.claude/projects/<slug/memory/.md.
Related
Categories
Questions about Session Compare
What does Session Compare do?
Compare two sessions side-by-side using Agent Monitor data — per-model token usage (input/output/cacheread/cachewrite + compaction baselines), pricing engine cost breakdowns, workflow intelligence…. Session Compare is an agent skill from hoangsonww/Claude-Code-Agent-Monitor. Compare two sessions side-by-side using Agent Monitor data — per-model token usage (input/output/cacheread/cachewrite + compaction baselines), pricing engine cost breakdowns, workflow intelligence (complexity scores, tool flow transitions, subagent effectiveness), session metadata (thinkingblocks, turncount, turndurationms, usageextras), and full event timelines with all 10+ event types.
When should I use Session Compare?
Session Compare fits situations like: tasks that involve Subagents.
How do I install Session Compare in Claude Code?
Run `npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill session-compare -a claude-code`. Or copy the skill folder (plugins/ccam-insights/skills/session-compare in hoangsonww/Claude-Code-Agent-Monitor) into .claude/skills/session-compare in your project. Claude Code loads it when a task matches its description.
How do I install Session Compare in Codex?
Run `npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill session-compare -a codex`. Or copy the skill folder (plugins/ccam-insights/skills/session-compare in hoangsonww/Claude-Code-Agent-Monitor) into .agents/skills/session-compare in your project. Codex loads it when a task matches its description.
Can I use Session Compare in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill session-compare -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/session-compare, .gemini/skills/session-compare, .github/skills/session-compare and .opencode/skills/session-compare in your project.
What does Session Compare need to run?
SKILL.md names no scripts, command-line tools or credentials: Session Compare is instructions for the agent only.
Does Session Compare access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Session Compare safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Session Compare use?
Session Compare is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Session Compare use?
About 790 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Session Compare?
Skills that share tags, products or a category with Session Compare: Claude Code Agent Development (anthropics/claude-plugins-official, 38k stars), Subagent Driven Development (Asvarox/allkaraoke, 261 stars), Dispatching Parallel Agents (ultralisp/ultralisp, 258 stars) and Paseo Advisor Second Opinion (getpaseo/paseo, 20k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Session Compare?
hoangsonww (a GitHub user) maintains it in hoangsonww/Claude-Code-Agent-Monitor, which has 1,052 GitHub stars. The repository holds 78 skills in this directory. The repository was last updated on October 6, 2026.
Source: hoangsonww/Claude-Code-Agent-Monitor on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.