Tosefta על ברכות 5:9

We do not say anything [personal] after [the Beracha (blessing) of] Emet Veyatziv. But we do say [personal] things after [the] prayer [of Shmoneh Esreh], even if it is [as long as] the confession (Vidui) of Yom Kippur.

We do not stand up to pray [Shmoneh Esreh directly after], a regular conversation, or after laughter or after idle actions or after frivolous behavior, bur rather [only] after words of wisdom. And also a person should not leave his friend [directly] after a regular conversation, or after laughter, or after idle actions, or after frivolous behavior, but rather [only] after words of wisdom. Because that is what we find the early prophets did, that they finished their words with the words of praise and consolation.

[In] a place where it is customary to say Birkat Aveilim (Blessing of the Mourners), [if the custom is to say] three [Berachot (blessings)], [then] they say three [Berachot]. [If the custom is to say] two [Berachot], [then] they say two [Berachot]. [If the custom is to say] one [Beracha], [then] they say one [Beracha]. [In] a place where it is customary to say Birkat Aveilim (Blessing of the Mourners), [if the custom is to say] three [Berachot] including the first one [on the subject of] Techiyat Hametim (Resurrection of the Dead) and he seals it off [by saying Baruch Ata Hashem] Mechayeh Hametim (Blessed are You Hashem Who resurrects the dead). The second [Beracha is on the subject of] Tanchumei Aveilim (Consolation of the Mourners), and he seals it off [by saying Baruch Ata Hashem] Menachem Amo Veiro (Blessed are You Hashem who consoles His nation and His city). The third [Beracha is said on the subject of] Gemilut Chasadim (Deeds of Kindness), and he does not seal it off.