Context Mode vs Codex MCP Tool
A side-by-side look at the Context Mode and Codex MCP Tool MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Context Mode for coding agents work as a local process; choose Codex MCP Tool for coding agents as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Context Mode when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
ctx_batch_execute, ctx_execute, ctx_execute_file.
Choose Codex MCP Tool when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: other.
- You have the keys it needs:
CODEX_CLI_PATH, CODEX_SESSION_TTL_MS, CODEX_MAX_SESSIONS. - You want tools like
ask-codex, batch-codex, review-changes.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Coding Agents | Coding Agents |
| Quality signal | 69/100 · Great | 68/100 · Great |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | No auth required | other |
| Pricing | Free | BYOK (pay the provider) |
| Required env vars | None listed | CODEX_CLI_PATHCODEX_SESSION_TTL_MSCODEX_MAX_SESSIONS |
| Verified owner | Community listing | Community listing |
| GitHub stars | 32,005 | 24 |
| Directory activity | 2 views 0 installs 0 upvotes | 4 views 0 installs 0 upvotes |
| Tools | 10 | 13 |
| Full listing | View Context Mode | View Codex MCP Tool |
Tools & capabilities
Context Mode tools 10
ctx_batch_executeRun multiple commands + search multiple queries in ONE call. Opt-in `concurrency: 1-8` for I/O-bound batches.ctx_executeRun code in 12 languages. Only stdout enters context.ctx_execute_fileProcess files in sandbox. Raw content never leaves.ctx_indexChunk markdown into FTS5 with BM25 ranking.ctx_searchQuery indexed content with multiple queries in one call.ctx_fetch_and_indexFetch URL, chunk and index. Cache reuses content within TTL (default 24h, override per-call with `ttl: <ms>`). `ttl: 0` or `force: true` to bypass. Pass `requests: [{url, source}, ...]` + `concurrency: 1-8` for parallel multi-URL.ctx_statsShow context savings, call counts, and session statistics.ctx_doctorDiagnose installation: runtimes, hooks, FTS5, versions.ctx_upgradeUpgrade to latest version from GitHub, rebuild, reconfigure hooks.ctx_purgePermanently deletes all indexed content from the knowledge base.
Codex MCP Tool tools 13
ask-codexExecute Codex CLI with file analysis (@syntax), skills ($syntax), model selection, and safety controls. Supports changeMode.batch-codexDelegate multiple atomic tasks to Codex for batch processing. Ideal for repetitive operations, mass refactoring, and automated code transformationsreview-changesRun a code review against the current repository using Codex CLI native review subcommandpingEchohelpreceive help informationversionDisplay version and system informationbrainstormGenerate creative ideas using structured frameworks with domain context and feasibility analysis.fetch-chunkRetrieves cached chunks from a changeMode response. Use this to get subsequent chunks after receiving a partial changeMode response.timeout-testTest timeout prevention by running for a specified durationlist-sessionsList all active conversation sessions with metadata, or manage sessionshealthCheck Codex CLI and session health statuslist-skillsDiscover available Codex skills from .agents/skills/ directory- +1 more on the listing page
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Context Mode
{
"mcpServers": {
"context-mode": {
"command": "npx",
"args": [
"-y",
"context-mode"
]
}
}
}
Codex MCP Tool
{
"mcpServers": {
"x51xxx-codex-mcp-tool": {
"command": "npx",
"args": [
"-y",
"@trishchuk/codex-mcp-tool"
],
"env": {
"CODEX_CLI_PATH": "YOUR_CODEX_CLI_PATH_HERE",
"CODEX_SESSION_TTL_MS": "YOUR_CODEX_SESSION_TTL_MS_HERE",
"CODEX_MAX_SESSIONS": "YOUR_CODEX_MAX_SESSIONS_HERE"
}
}
}
}
Frequently asked questions
Context Mode is categorized under Coding Agents and uses a local stdio subprocess. Codex MCP Tool belongs to Coding Agents and uses a local stdio subprocess. Pick Context Mode for coding agents work and Codex MCP Tool for coding agents.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Context Mode is listed as free. Auth: no auth required. Codex MCP Tool is bring-your-own-key: usage is billed by the API provider you supply a key for. Auth: other. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add context-mode and x51xxx-codex-mcp-tool as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Context Mode has a quality signal of 69/100 (Great) with 2 views, 0 installs and 32,005 GitHub stars. Codex MCP Tool has 68/100 (Great) with 4 views, 0 installs and 24 GitHub stars.