How do i make "display json" work for commands?

[vedujoshi]

This is more of a query. I am trying to get a json version of show interfaces terse | display json output
But as shown in the junos-mcp-server container logs below, the output is not json. Is there any other way to make it work ?

I can see that display set works, but display json is not working

2025-08-14 05:57:56,625 - ncclient.transport.ssh - INFO - Connected (version 2.0, client OpenSSH_9.7)
2025-08-14 05:57:57,962 - ncclient.transport.ssh - INFO - Authentication (publickey) successful!
2025-08-14 05:57:58,771 - ncclient.transport.ssh - INFO - [host <IP> session 0x7f6415a74b10] Sending:
b'<?xml version="1.0" encoding="UTF-8"?><nc:hello xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0"><nc:capabilities><nc:capability>urn:ietf:params:netconf:base:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:base:1.1</nc:capability><nc:capability>urn:ietf:params:netconf:capability:writable-running:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:capability:candidate:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:capability:confirmed-commit:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:capability:rollback-on-error:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:capability:startup:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:capability:url:1.0?scheme=http,ftp,file,https,sftp</nc:capability><nc:capability>urn:ietf:params:netconf:capability:validate:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:capability:xpath:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:capability:notification:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:capability:interleave:1.0</nc:capability><nc:capability>urn:ietf:params:netconf:capability:with-defaults:1.0</nc:capability></nc:capabilities></nc:hello>]]>]]>'
2025-08-14 05:57:58,934 - ncclient.transport.ssh - INFO - [host <IP> session 0x7f6415a74b10] Received message from host
2025-08-14 05:57:58,935 - ncclient.transport.ssh - INFO - [host <IP> session-id 18266] initialized: session-id=18266 | server_capabilities=<dict_keyiterator object at 0x7f6415969e90>
2025-08-14 05:57:58,936 - ncclient.operations.rpc - INFO - [host <IP> session-id 18266] Requesting 'ExecuteRpc'
2025-08-14 05:57:59,036 - ncclient.transport.ssh - INFO - [host <IP> session-id 18266] Sending:
b'<?xml version="1.0" encoding="UTF-8"?><nc:rpc xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="urn:uuid:bd46ab8b-dd04-4e7d-8cc5-630e72bf7818"><command format="text">show interfaces terse | display json</command></nc:rpc>]]>]]>'
2025-08-14 05:57:59,449 - ncclient.transport.ssh - INFO - [host <IP> session-id 18266] Received message from host
2025-08-14 05:57:59,450 - ncclient.operations.rpc - INFO - [host <IP> session-id 18266] Requesting 'CloseSession'
2025-08-14 05:57:59,551 - ncclient.transport.ssh - INFO - [host <IP> session-id 18266] Sending:
b'<?xml version="1.0" encoding="UTF-8"?><nc:rpc xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="urn:uuid:a4ea918b-362d-4019-88f7-01a388d1447e"><nc:close-session/></nc:rpc>]]>]]>'
2025-08-14 05:57:59,808 - ncclient.transport.ssh - INFO - [host <IP> session-id 18266] Received message from host
{"jsonrpc":"2.0","id":3,"result":{"content":[{"type":"text","text":"\nInterface               Admin Link Proto    Local                 Remote\nge-0/0/0                up    up\nge-0/0/0.0              up    up   inet     10.0.1.213/24   \ngr-0/0/0                up    up\nip-0/0/0                up    up\nlsq-0/0/0               up    up\nlt-0/0/0                up    up\nmt-0/0/0                up    up\nsp-0/0/0                up    up\nsp-0/0/0.0              up    up   inet    \n                                   inet6   \nsp-0/0/0.16383          up    up   inet    \nge-0/0/1                up    up\nge-0/0/1.0              up    up   inet     10.0.5.10/24    \ndsc                     up    up\nfti0                    up    up\nfxp0                    up    up\nfxp0.0                  up    up   inet     10.0.4.108/24   \ngre                     up    up\nipip                    up    up\nirb                     up    up\nlo0                     up    up\nlo0.16384               up    up   inet     127.0.0.1           --> 0/0\nlo0.16385               up    up   inet     10.0.0.1            --> 0/0\n                                            10.0.0.16           --> 0/0\n                                            128.0.0.1           --> 0/0\n                                            128.0.0.4           --> 0/0\n                                            128.0.1.16          --> 0/0\nlo0.32768               up    up  \nlsi                     up    up\nmtun                    up    up\npimd                    up    up\npime                    up    up\npp0                     up    up\nppd0                    up    up\nppe0                    up    up\nst0                     up    up\ntap                     up    up\nvlan                    up    down\n"}],"isError":false}}

[vjoshi-naisa]

Any update on this ?

[nileshsimaria]

@vjoshi-naisa this requires to take format=json param. In prompt, user can drive LLM to use format=json. I will add format argument in the tool.