Mcpc Agent Skill

Use the mcpc CLI to work with MCP (Model Context Protocol) servers from the shell - connect to a server as a persistent session, then list and call tools, read resources, get prompts, and run async tasks. Use --json for scripting and code mode. Reach for this whenever interacting with MCP servers, calling MCP tools, or accessing MCP resources programmatically.

3k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

746

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/apify/mcpc --skill mcpc

What it tells the agent to use

found in the instruction text

Bash runs shell commands — read the instruction before connecting

Grep reads your files

The instruction itself

16 sections, as written by the author

mcpc: MCP command-line client

mcpc maps every MCP operation to a shell command. For agents this is often more

efficient than function calling: discover the right tool on demand, then generate

shell commands (ideally with --json) instead of carrying tool definitions in context.

Mental model

Connect once to a server — this creates a persistent, named @session. A

background bridge process keeps the connection (and its state) alive.

Run commands against the @session: list/call tools, read resources, get

prompts, run async tasks. There is no one-shot mcpc <url> tools-list — connect first.

Default output is human-readable; add --json for machine-readable, MCP-spec

shaped output that composes with jq and shell pipelines (code mode).

Everything is self-documenting — when unsure, ask the CLI:

mcpc --help                       # all commands + global options
mcpc help connect                 # help for one command
mcpc @apify tools-call foo --help # that tool's details + schema

First steps

mcpc                                   # list sessions + auth profiles (start here)
mcpc connect mcp.apify.com @apify      # connect, create the @apify session
mcpc @apify                            # server info, capabilities, tools overview
mcpc @apify tools-list                 # list tools
mcpc @apify tools-call <tool> q:="hi"  # call a tool

Connecting

Server formats accepted by connect:

mcp.example.com — remote HTTP server (https:// is added automatically)
localhost:8080 or 127.0.0.1:8080 — local HTTP server (http:// is the default for localhost and 127.0.0.1)
~/.vscode/mcp.json:filesystem — a single entry from a config file (file:entry)
~/.vscode/mcp.json — connect every entry in a config file
_(no server)_ — auto-discover standard configs and connect all of them

mcpc connect mcp.apify.com @apify        # remote server, explicit session name
mcpc connect mcp.apify.com               # auto-name the session → @apify
mcpc connect ./.vscode/mcp.json:fs @fs   # one config entry (stdio or http)
mcpc connect                             # discover standard configs + connect everything

@session is optional — omit it to auto-generate a name from the server

(mcp.apify.com → @apify). A matching session (same server + auth) is reused.

Stdio (command-based) entries launch a local process on connect — only connect

to configs you trust. Bulk connects skip stdio entries unless you pass --stdio.

The MCP protocol version is negotiated automatically. Pass

--protocol-version <version> (e.g. --protocol-version 2025-11-25) to pin

one exact version — the connection fails if the server does not support it.

login / logout only accept an MCP server URL (a bare host or full

http(s):// URL) — not config files or auto-discovery.

Sessions

mcpc                     # list all sessions and their state
mcpc @apify              # session details, capabilities, tools (also reports the
                         # negotiated MCP version and the transport carrying it)
mcpc restart @apify      # restart (after server updates, or to recover an 'expired' session)
mcpc close @apify        # tear the session down

Session states:

🟢 live — ready to use
🟡 connecting / reconnecting — transient; retry in a moment
🟡 disconnected — bridge alive but the server has gone quiet; retry to reconnect
🟡 crashed — bridge process died; auto-restarts on next use
🔴 unauthorized — auth failed; run mcpc login <server> then mcpc restart @session
🔴 expired — server dropped the session; run mcpc restart @session

Discovering and inspecting tools

mcpc @apify tools-list                  # compact list with inline param signatures
mcpc @apify tools-list --full           # full JSON schemas
mcpc @apify tools-get <tool>            # one tool's details + schema
mcpc @apify tools-call <tool> --help    # shortcut for tools-get: that tool's details + schema

mcpc grep "search"                      # search tools + instructions across ALL sessions
mcpc @apify grep "actor" --resources    # search one session
# grep filters: --tools/--resources/--prompts/--instructions, -E regex, -s case-sensitive, -m <n> max
# grep exits 0 on match, 1 on no matches (grep convention)

Prefer progressive discovery: grep to find the right tool, then tools-get for its

schema. This keeps token use low instead of dumping every tool definition.

For scripts and CI, pin a tool's schema to catch breaking changes early:

mcpc --json @apify tools-get <tool> > expected.json          # snapshot the schema
mcpc @apify tools-call <tool> --schema expected.json <args>  # fail fast if it drifted
# also on tools-get; --schema-mode strict | compatible (default) | ignore

Calling tools (passing arguments)

Arguments go after the tool name. Three interchangeable styles:

# 1) key:=value — values are auto-parsed as JSON, falling back to string
mcpc @apify tools-call search query:="hello world" limit:=10 enabled:=true
mcpc @apify tools-call search config:='{"nested":"value"}' items:='[1,2,3]'
mcpc @apify tools-call search id:='"123"'          # force a string with JSON quotes

# 2) inline JSON — when the first arg starts with { or [
mcpc @apify tools-call search '{"query":"hello","limit":10}'

# 3) stdin — auto-detected when piped and no positional args are given
echo '{"query":"hello"}' | mcpc @apify tools-call search

JSON output (code mode)

Add --json for machine-readable output: results on stdout, errors on stderr,

shaped strictly per the MCP spec.

mcpc --json @apify tools-list | jq -r '.[].name'
mcpc --json @apify tools-call search query:="test" | jq -r '.content[0].text'

# chain tools across calls/sessions
mcpc --json @apify tools-call search-actors keywords:="scraper" \
  | jq -r '.content[0].text | fromjson | .items[0].id' \
  | xargs -I{} mcpc --json @apify tools-call get-actor actorId:="{}"

mcpc --json with no command returns { "sessions": [...], "profiles": [...] }.

Resources and prompts

mcpc @apify resources-list
mcpc @apify resources-read "file:///path/to/file"   # -o <file> to save (binary-safe), --raw to pipe
mcpc @apify resources-templates-list
mcpc @apify resources-subscribe <uri> <file>        # keep local <file> in sync with the resource
mcpc @apify resources-unsubscribe <uri>             # stop syncing, keep the file

mcpc @apify prompts-list
mcpc @apify prompts-get <name> arg1:=value1         # same argument syntax as tools-call (values coerced to strings)

Async tasks (long-running tools)

mcpc @apify tools-call <tool> --task <args>     # run as a task with a progress spinner; Ctrl+C (or
                                                # ESC) leaves it running and prints the task ID.
                                                # Falls back to a normal sync call if the server has no task support.
mcpc @apify tools-call <tool> --detach <args>   # start and return the task ID immediately
mcpc @apify tasks-list
mcpc @apify tasks-get <taskId>                  # status
mcpc @apify tasks-result <taskId>               # block until the final result is ready
mcpc @apify tasks-cancel <taskId>

Task commands need a server on MCP protocol 2025-11-25 that advertises the tasks

capability (tools-list flags it per tool as [task:optional|required|forbidden]).

Otherwise --task/--detach and the tasks-* commands fail with an error — they

never silently fall back to a synchronous call, so --detach output always has a

taskId or a non-zero exit code. On 2026-07-28 servers tasks are an extension mcpc

does not support yet.

Authentication

# OAuth — interactive browser login, saved as a reusable profile
mcpc login mcp.apify.com                    # "default" profile
mcpc login mcp.apify.com --profile work     # a named profile (multiple accounts per server)
mcpc connect mcp.apify.com @apify --profile work
mcpc logout mcp.apify.com

# Bearer token — not stored as a profile; kept per-session
mcpc connect mcp.apify.com @s -H "Authorization: Bearer $TOKEN"
mcpc @s tools-list

# Machine-to-machine (CI/CD, daemons) — client-credentials grant, no browser needed
mcpc login mcp.example.com --grant client-credentials --client-id my-svc --client-secret s3cr3t

# Enterprise-managed authorization — SSO once at the corporate IdP (e.g. Okta),
# then identity assertion grants (ID-JAG); clients are pre-registered by IT
mcpc login mcp.example.com --grant id-jag --idp https://acme.okta.com \
  --idp-client-id idp-client --client-id mcp-client --client-secret s3cr3t

With no auth flags, mcpc uses the default profile if one exists, otherwise it

connects anonymously. Use --no-profile to force an anonymous connection, or

--profile <name> to require a specific one.

Proxy for AI isolation

Expose an authenticated session as a local MCP server, so sandboxed AI code can use it

without ever seeing your real credentials:

# Human: authenticated session + proxy listening on :8080
mcpc connect mcp.apify.com @ai-proxy --profile ai-access --proxy 8080

# AI in a sandbox limited to localhost: no access to the original tokens
mcpc connect localhost:8080 @sandboxed
mcpc @sandboxed tools-list

A proxy does not make an untrusted server safe — stdio servers still touch your system,

and HTTP servers still hold your credentials. Only connect to servers you trust.

Server-published skills (experimental)

Distinct from this guide: some MCP servers publish their own agent skills

(draft MCP extension, SEP-2640). Read them with:

mcpc @apify skills-list
mcpc @apify skills-get <name> --raw    # print the SKILL.md markdown (pipe to a file or an LLM)

(mcpc help --skill documents mcpc itself; skills-list / skills-get fetch skills from the server.)

Global flags worth knowing

--json                  # machine-readable, MCP-spec-shaped output (code mode)
--verbose               # protocol-level debug logging (JSON-RPC, transport)
--profile <name>        # OAuth profile to use ("default" if omitted)
--timeout <seconds>     # request timeout in seconds (default: 60)
--max-chars <n>         # truncate human-readable output to n chars (ignored with --json)
--insecure              # skip TLS verification (self-signed certs only)

(--no-profile, --stdio, --proxy, and -H are options of connect, not global flags.)

mcpc also has experimental --x402 auto-payment for paid MCP tools — see mcpc help x402.

Debugging

mcpc --verbose @apify tools-call <tool>   # protocol-level detail (JSON-RPC, transport)
mcpc @apify logs                          # bridge log; -n <N>, --follow, --since 1h
mcpc @apify ping                          # round-trip health check
mcpc @apify server-discover               # what the server advertises now (2026-07-28 only;
                                          # on older servers use mcpc @apify instead)
mcpc @apify logging-set-level debug       # deprecated; 2025-11-25 servers only, will be removed
mcpc clean                                # tidy stale sessions/logs (also: mcpc clean all)

Exit codes

0 — success
1 — client error (invalid arguments, unknown command); grep also exits 1 on no matches
2 — server error (tool failed, resource not found)
3 — network error
4 — authentication error

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2k tokens

How to use it

Copy the folder

Take apify/mcpc from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.