telegram-reader

Telegram News Skill (Read-Only)

Reads Telegram channels and groups for financial news and market research using tdl, a Telegram CLI tool.

This skill is read-only. It is designed for financial research: reading channel messages, monitoring financial news channels, and exporting message history. It does NOT support sending messages, joining/leaving channels, or any write operations.

Step 1: Ensure tdl Is Installed

Current environment status:

!`(command -v tdl && tdl version 2>&1 | head -3 || echo "TDL_NOT_INSTALLED") 2>/dev/null`

If the status above shows a version number, tdl is installed — skip to Step 2.

If TDL_NOT_INSTALLED, install tdl based on the user's platform:

Platform	Install Command
macOS / Linux	`curl -sSL https://docs.iyear.me/tdl/install.sh \\| sudo bash`
macOS (Homebrew)	`brew install telegram-downloader`
Linux (Termux)	`pkg install tdl`
Linux (AUR)	`yay -S tdl`
Linux (Nix)	`nix-env -iA nixos.tdl`
Go (any platform)	`go install github.com/iyear/tdl@latest`

Ask the user which installation method they prefer. Default to Homebrew on macOS, curl script on Linux.

Step 2: Ensure tdl Is Authenticated

Current auth status:

!`(tdl chat ls --limit 1 2>&1 >/dev/null && echo "AUTH_OK" || echo "AUTH_NEEDED") 2>/dev/null`

If AUTH_OK, skip to Step 3.

If AUTH_NEEDED, guide the user through login. Login requires interactive input — the user must enter their phone number and verification code manually.

Login methods

Method A: QR Code (recommended — fastest)

tdl login -T qr

A QR code will be displayed in the terminal. The user scans it with their Telegram mobile app (Settings > Devices > Link Desktop Device).

Method B: Phone + Code

tdl login -T code

The user enters their phone number, then the verification code sent to their Telegram app.

Method C: Import from Telegram Desktop

If the user has Telegram Desktop installed and logged in:

tdl login

This imports the session from the existing desktop client. The desktop client must be from the official website, NOT from the App Store or Microsoft Store.

Namespaces

By default, tdl uses a default namespace. To manage multiple accounts:

tdl login -n work -T qr      # Login to "work" namespace
tdl chat ls -n work           # Use "work" namespace for commands

Important login notes

If login fails, ask the user to check their internet connection and try again.

Never ask for or handle Telegram passwords/2FA codes programmatically — always let the user enter them interactively.

Step 3: Identify What the User Needs

Match the user's request to one of the read operations below.

User Request	Command	Key Flags
List all chats/channels	`tdl chat ls`	`-o json`, `-f "FILTER"`
List only channels	`tdl chat ls -f "Type contains 'channel'"`	`-o json`
Export recent messages	`tdl chat export -c CHAT -T last -i N`	`--all`, `--with-content`
Export messages by time range	`tdl chat export -c CHAT -T time -i START,END`	`--all`, `--with-content`
Export messages by ID range	`tdl chat export -c CHAT -T id -i FROM,TO`	`--all`, `--with-content`
Export from a topic/thread	`tdl chat export -c CHAT --topic TOPIC_ID`	`--all`, `--with-content`
Search for a channel by name	`tdl chat ls -f "VisibleName contains 'NAME'"`	`-o json`

Chat identifiers

The -c flag accepts multiple formats:

Format	Example
Username (with @)	`-c @channel_name`
Username (without @)	`-c channel_name`
Numeric chat ID	`-c 123456789`
Public link	`-c https://t.me/channel_name`
Phone number	`-c "+1 123456789"`
Saved Messages	`-c ""` (empty)

Step 4: Execute the Command

Listing chats

# List all chats
tdl chat ls

# JSON output for processing
tdl chat ls -o json

# Filter for channels only
tdl chat ls -f "Type contains 'channel'"

# Search by name
tdl chat ls -f "VisibleName contains 'Bloomberg'"

Exporting messages

Always use --all --with-content to get text messages (not just media):

# Last 20 messages from a channel
tdl chat export -c @channel_name -T last -i 20 --all --with-content -o /tmp/tdl-export.json

# Messages from a time range (Unix timestamps)
tdl chat export -c @channel_name -T time -i 1710288000,1710374400 --all --with-content -o /tmp/tdl-export.json

# Messages by ID range
tdl chat export -c @channel_name -T id -i 100,200 --all --with-content -o /tmp/tdl-export.json

Key rules

Check auth first — run tdl chat ls --limit 1 before other commands to verify the session is valid

Always use --all --with-content when exporting messages for reading — without these flags, tdl only exports media messages

Use -o FILE to save exports to a file, then read the JSON — this is more reliable than parsing stdout

Start with small exports — use -T last -i 20 unless the user asks for more

Use filters on chat ls to help users find the right channel before exporting

NEVER execute write operations — this skill is read-only; do not send messages, join channels, or modify anything

Convert timestamps — when the user gives dates, convert to Unix timestamps for the -T time filter

Working with exported JSON

After exporting, read the JSON file and extract the relevant information:

# Export messages
tdl chat export -c @channel_name -T last -i 20 --all --with-content -o /tmp/tdl-export.json

# Read and process the export
cat /tmp/tdl-export.json

The export JSON contains message objects with fields like id, date, message (text content), from_id, views, and media metadata.

Step 5: Present the Results

After fetching data, present it clearly for financial research:

Summarize key messages — highlight the most relevant news or market updates

Include timestamps — show when each message was posted

Group by topic — if multiple channels, organize by theme (macro, earnings, crypto, etc.)

Flag actionable information — note breaking news, price targets, earnings surprises

Provide channel context — mention which channel/group each message came from

For channel lists, show channel name, member count, and type

Step 6: Diagnostics

If something isn't working:

Error	Cause	Fix
`not authorized` or session errors	Not logged in or session expired	Run `tdl login -T qr` to re-authenticate
`FLOOD_WAIT_X`	Rate limited by Telegram	Wait X seconds, then retry
`CHANNEL_PRIVATE`	No access to channel	User must join the channel in their Telegram app first
`tdl: command not found`	tdl not installed	Install using Step 1

Reference Files

references/commands.md — Complete tdl command reference for reading channels and exporting messages

Read the reference file when you need exact command syntax or detailed flag documentation.

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