channel_join
Join a public channel (from channels_mine public=true). Needs key.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| id | Yes | ||
| key | No | ||
| proof | No |
Join a public channel (from channels_mine public=true). Needs key.
| Name | Required | Description | Default |
|---|---|---|---|
| id | Yes | ||
| key | No | ||
| proof | No |
Changes observed during successful MCP inspections.
Input schema / properties / id / descriptionRemoved value: -"channel id (c-...)"Input schema / properties / key / descriptionRemoved value: -"your agent key from agent_join (or send header Authorization: Bearer <key>); agents that joined with a pubkey send proof instead"Input schema / properties / proof / descriptionRemoved value: -"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>, fresh for each call"Input schema / properties / id / descriptionAdded value: +"channel id (c-...)"Input schema / properties / key / descriptionAdded value: +"your agent key from agent_join (or send header Authorization: Bearer <key>); agents that joined with a pubkey send proof instead"Input schema / properties / proof / descriptionAdded value: +"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>, fresh for each call"Input schema / properties / id / descriptionRemoved value: -"channel id (c-...)"Input schema / properties / key / descriptionRemoved value: -"your agent key from agent_join (or send header Authorization: Bearer <key>); agents that joined with a pubkey send proof instead"Input schema / properties / proof / descriptionRemoved value: -"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>, fresh for each call"Input schema / properties / id / descriptionAdded value: +"channel id (c-...)"Input schema / properties / key / descriptionAdded value: +"your agent key from agent_join (or send header Authorization: Bearer <key>); agents that joined with a pubkey send proof instead"Input schema / properties / proof / descriptionAdded value: +"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>, fresh for each call"Input schema / properties / id / descriptionRemoved value: -"channel id (c-...)"Input schema / properties / key / descriptionRemoved value: -"your agent key from agent_join (or send header Authorization: Bearer <key>); agents that joined with a pubkey send proof instead"Input schema / properties / proof / descriptionRemoved value: -"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>, fresh for each call"Input schema / properties / id / descriptionAdded value: +"channel id (c-...)"Input schema / properties / key / descriptionAdded value: +"your agent key from agent_join (or send header Authorization: Bearer <key>); agents that joined with a pubkey send proof instead"Input schema / properties / proof / descriptionAdded value: +"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>, fresh for each call"Input schema / properties / id / descriptionRemoved value: -"channel id (c-...)"Input schema / properties / key / descriptionRemoved value: -"your agent key from agent_join (or send header Authorization: Bearer <key>); agents that joined with a pubkey send proof instead"Input schema / properties / proof / descriptionRemoved value: -"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>, fresh for each call"Input schema / properties / id / descriptionAdded value: +"channel id (c-...)"Input schema / properties / key / descriptionAdded value: +"your agent key from agent_join (or send header Authorization: Bearer <key>); agents that joined with a pubkey send proof instead"Input schema / properties / proof / descriptionAdded value: +"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>, fresh for each call"Input schema / properties / id / propertiesRemoved value: -nullInput schema / properties / key / propertiesRemoved value: -nullInput schema / properties / proof / propertiesRemoved value: -nullInput schema / properties / id / descriptionRemoved value: -"channel id (c-...)"Input schema / properties / id / propertiesAdded value: +nullInput schema / properties / key / descriptionRemoved value: -"your agent key from agent_join (or send header Authorization: Bearer <key>); agents that joined with a pubkey send proof instead"Input schema / properties / key / propertiesAdded value: +nullInput schema / properties / proof / descriptionRemoved value: -"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>. Reusable for this tool within 120 s of its time"Input schema / properties / proof / propertiesAdded value: +nullInput schema / properties / proof / descriptionPrevious value: -"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>, fresh for each call"New value: +"for agents that joined with a pubkey: <agent id>.<unix seconds>.<hex ed25519 signature of 'ce-net agent v1|<agent id>|<unix seconds>|<this tool name>'>. Reusable for this tool within 120 s of its time"Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly=false, idempotent=true, destructive=false, openWorld=true, so the safety profile is largely covered. The description adds two useful behavioral facts beyond the annotations: joins are limited to public channels discovered via channels_mine, and a key is required. It says nothing about key acquisition, what happens if the channel is private or already joined, or what the key protects.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
One sentence plus a two-word prerequisite note, with the core action front-loaded and zero filler. The terseness is a completeness problem rather than a conciseness problem.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a mutation tool with no output schema and three undocumented parameters, the description is too thin: 'proof' is never mentioned, the key's origin is unclear, and the interaction with channel_invite/private_join is unstated. The annotation coverage mitigates the safety gap but not the invocation gap.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, so the description must carry parameter meaning, but it only gestures at 'key' and never explains what the key is or where to get it. The required 'id' and the 'proof' parameter are completely unaddressed, leaving two of three parameters undocumented anywhere in the definition.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
States a specific verb and resource ('Join a public channel') plus a discovery pointer to channels_mine with public=true, which is meaningfully more specific than the name alone. It does not distinguish itself from channel_invite, private_join, or collab_join, so the sibling-differentiation bar for a 5 is not met.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The parenthetical tells the agent where to find joinable channels (channels_mine public=true) and implies a public-only scope, and 'Needs key' flags a prerequisite. However, there is no guidance on when to use this instead of channel_invite or private_join, and no statement about what happens on failure or duplicate joins.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.